{"id":4641,"date":"2026-11-02T07:35:35","date_gmt":"2026-11-02T07:35:35","guid":{"rendered":"https:\/\/www.chess.lumn.eu\/wordpress\/?p=4641"},"modified":"2026-11-02T07:35:35","modified_gmt":"2026-11-02T07:35:35","slug":"mephisto-risc-ii-56mhz","status":"publish","type":"post","link":"https:\/\/www.chess.lumn.eu\/wordpress\/2026\/11\/02\/mephisto-risc-ii-56mhz\/","title":{"rendered":"Mephisto RISC II 56MHz"},"content":{"rendered":"\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=DM+Serif+Display&#038;family=DM+Sans:wght@400;500;700&#038;family=JetBrains+Mono:wght@400;600&#038;display=swap\" rel=\"stylesheet\">\n<style>\n.naum-body{--creme:#f7f4ee;--encre:#2b2b2b;--rouge:#c0392b;--or:#b8863b;--trait:#e3ddd0;--gris:#6b665c;\nmax-width:860px;margin:0 auto;padding:0 0 3rem;background:var(--creme);color:var(--encre);\nfont-family:\"DM Sans\",system-ui,sans-serif;font-size:1.03rem;line-height:1.68;}\n.naum-body 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r=\"2.75\"><\/circle><circle cx=\"14\" cy=\"9\" r=\"2.75\"><\/circle><circle cx=\"22.5\" cy=\"8\" r=\"2.75\"><\/circle><circle cx=\"31\" cy=\"9\" r=\"2.75\"><\/circle><circle cx=\"39\" cy=\"12\" r=\"2.75\"><\/circle><\/g><path d=\"M9 26c8.5-1.5 21-1.5 27 0l2.5-12.5L31 25l-.3-14.1-5.2 13.6-3-14.5-3 14.5-5.2-13.6L14 25 6.5 13.5 9 26zM9 26c0 2 1.5 2 2.5 4 1 1.5 1 1 .5 3.5-1.5 1-1.5 2.5-1.5 2.5-1.5 1.5.5 2.5.5 2.5 6.5 1 16.5 1 23 0 0 0 1.5-1 0-2.5 0 0 .5-1.5-1-2.5-.5-2.5-.5-2 .5-3.5 1-2 2.5-2 2.5-4-8.5-1.5-18.5-1.5-27 0z\" stroke-linecap=\"butt\"><\/path><path d=\"M11 38.5a35 35 1 0 0 23 0\" fill=\"none\" stroke-linecap=\"butt\"><\/path><path d=\"M11 29a35 35 1 0 1 23 0M12.5 31.5h20M11.5 34.5a35 35 1 0 0 22 0M10.5 37.5a35 35 1 0 0 24 0\" fill=\"none\" stroke=\"#fff\"><\/path><\/g><g id=\"black-king\" class=\"black king\" fill=\"none\" fill-rule=\"evenodd\" stroke=\"#000\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22.5 11.63V6\" stroke-linejoin=\"miter\"><\/path><path d=\"M22.5 25s4.5-7.5 3-10.5c0 0-1-2.5-3-2.5s-3 2.5-3 2.5c-1.5 3 3 10.5 3 10.5\" fill=\"#000\" stroke-linecap=\"butt\" stroke-linejoin=\"miter\"><\/path><path d=\"M11.5 37c5.5 3.5 15.5 3.5 21 0v-7s9-4.5 6-10.5c-4-6.5-13.5-3.5-16 4V27v-3.5c-3.5-7.5-13-10.5-16-4-3 6 5 10 5 10V37z\" fill=\"#000\"><\/path><path d=\"M20 8h5\" stroke-linejoin=\"miter\"><\/path><path d=\"M32 29.5s8.5-4 6.03-9.65C34.15 14 25 18 22.5 24.5l.01 2.1-.01-2.1C20 18 9.906 14 6.997 19.85c-2.497 5.65 4.853 9 4.853 9M11.5 30c5.5-3 15.5-3 21 0m-21 3.5c5.5-3 15.5-3 21 0m-21 3.5c5.5-3 15.5-3 21 0\" stroke=\"#fff\"><\/path><\/g>\n<\/defs><\/svg>\n<div class=\"hero\">\n<svg class=\"hero-bg\" viewBox=\"0 0 860 320\" preserveAspectRatio=\"xMidYMid slice\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n<defs><pattern id=\"r2grid\" width=\"40\" height=\"40\" patternUnits=\"userSpaceOnUse\"><path d=\"M40 0H0v40\" fill=\"none\" stroke=\"#b8863b\" stroke-width=\".5\"\/><\/pattern><\/defs>\n<rect width=\"860\" height=\"320\" fill=\"url(#r2grid)\"\/>\n<circle cx=\"200\" cy=\"160\" r=\"80\" fill=\"none\" stroke=\"#b8863b\" stroke-width=\".8\"\/>\n<circle cx=\"200\" cy=\"160\" r=\"50\" fill=\"none\" stroke=\"#b8863b\" stroke-width=\".5\"\/>\n<line x1=\"280\" y1=\"160\" x2=\"400\" y2=\"160\" stroke=\"#b8863b\" stroke-width=\".5\"\/>\n<circle cx=\"640\" cy=\"100\" r=\"40\" fill=\"none\" stroke=\"#c0392b\" stroke-width=\".6\"\/>\n<line x1=\"680\" y1=\"100\" x2=\"780\" y2=\"100\" stroke=\"#c0392b\" stroke-width=\".4\"\/>\n<\/svg>\n<div class=\"hero-content\">\n<p class=\"eyebrow\">Laboratoire \u00b7 acc\u00e9l\u00e9ration<\/p>\n<h1 class=\"titre\">Mephisto RISC II \u00e0 56 MHz<\/h1>\n<p class=\"sous-titre\">Gauntlet acc\u00e9l\u00e9r\u00e9 CB-Emu&nbsp;: le Gideon 3.1 d&#8217;Ed Schr\u00f6der, quatre fois plus vite<\/p>\n<div class=\"hero-machine\">\n<div class=\"hero-svg-wrap\">\n<svg viewBox=\"0 0 220 175\" width=\"220\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Module Mephisto RISC II, dessin stylis\u00e9\">\n<rect x=\"10\" y=\"22\" width=\"200\" height=\"138\" rx=\"5\" fill=\"#2a2420\" stroke=\"#4a4035\" stroke-width=\"1.2\"\/>\n<rect x=\"10\" y=\"22\" width=\"200\" height=\"26\" rx=\"5\" fill=\"#332e28\"\/>\n<rect x=\"10\" y=\"42\" width=\"200\" height=\"6\" fill=\"#332e28\"\/>\n<text x=\"26\" y=\"40\" font-family=\"'DM Serif Display',Georgia,serif\" font-size=\"11\" fill=\"#b8863b\" letter-spacing=\".5\">MEPHISTO<\/text>\n<text x=\"128\" y=\"40\" font-family=\"'DM Sans',sans-serif\" font-size=\"8.5\" fill=\"#a09882\" letter-spacing=\"1\">RISC II<\/text>\n<rect x=\"26\" y=\"56\" width=\"168\" height=\"34\" rx=\"2\" fill=\"#1a2a1a\" stroke=\"#3a4a3a\" stroke-width=\".7\"\/>\n<text x=\"36\" y=\"71\" font-family=\"'JetBrains Mono',monospace\" font-size=\"10\" fill=\"#4adf4a\" opacity=\".9\">Txf3 Dh2+ Ce4+<\/text>\n<text x=\"36\" y=\"84\" font-family=\"'JetBrains Mono',monospace\" font-size=\"9\" fill=\"#4adf4a\" opacity=\".65\">Gideon 3.1   +5.12<\/text>\n<rect x=\"26\" y=\"98\" width=\"78\" height=\"40\" rx=\"2\" fill=\"#221d19\" stroke=\"#4a4035\" stroke-width=\".6\"\/>\n<text x=\"65\" y=\"113\" text-anchor=\"middle\" font-family=\"'JetBrains Mono',monospace\" font-size=\"7\" fill=\"#8a8578\">ARM2<\/text>\n<text x=\"65\" y=\"127\" text-anchor=\"middle\" font-family=\"'JetBrains Mono',monospace\" font-size=\"9\" fill=\"#b8863b\">14 \u2192 56<\/text>\n<rect x=\"114\" y=\"100\" width=\"22\" height=\"11\" rx=\"2\" fill=\"#3a3530\" stroke=\"#4a4540\" stroke-width=\".4\"\/>\n<rect x=\"142\" y=\"100\" width=\"22\" height=\"11\" rx=\"2\" fill=\"#3a3530\" stroke=\"#4a4540\" stroke-width=\".4\"\/>\n<rect x=\"170\" y=\"100\" width=\"22\" height=\"11\" rx=\"2\" fill=\"#3a3530\" stroke=\"#4a4540\" stroke-width=\".4\"\/>\n<rect x=\"114\" y=\"117\" width=\"22\" height=\"11\" rx=\"2\" fill=\"#3a3530\" stroke=\"#4a4540\" stroke-width=\".4\"\/>\n<rect x=\"142\" y=\"117\" width=\"22\" height=\"11\" rx=\"2\" fill=\"#3a3530\" stroke=\"#4a4540\" stroke-width=\".4\"\/>\n<rect x=\"170\" y=\"117\" width=\"22\" height=\"11\" rx=\"2\" fill=\"#3a3530\" stroke=\"#4a4540\" stroke-width=\".4\"\/>\n<text x=\"181\" y=\"125.5\" text-anchor=\"middle\" font-family=\"'JetBrains Mono',monospace\" font-size=\"5\" fill=\"#c0392b\">ENT<\/text>\n<circle cx=\"120\" cy=\"134\" r=\"2.5\" fill=\"#c0392b\" opacity=\".85\"\/>\n<circle cx=\"120\" cy=\"134\" r=\"5\" fill=\"#c0392b\" opacity=\".12\"\/>\n<rect x=\"26\" y=\"144\" width=\"168\" height=\"2\" rx=\"1\" fill=\"#b8863b\" opacity=\".35\"\/>\n<text x=\"110\" y=\"156\" text-anchor=\"middle\" font-family=\"'JetBrains Mono',monospace\" font-size=\"6.5\" fill=\"#6b665c\" letter-spacing=\".6\">GIDEON 3.1 \u00b7 ED SCHR\u00d6DER \u00b7 \u00d74<\/text>\n<\/svg>\n<\/div>\n<div class=\"hero-specs\">\n<div class=\"spec\"><div class=\"sv\">2374<\/div><div class=\"sl\">Elo \u00b114<\/div><\/div>\n<div class=\"spec\"><div class=\"sv\">\u00d74<\/div><div class=\"sl\">14 \u2192 56 MHz<\/div><\/div>\n<div class=\"spec\"><div class=\"sv\">181<\/div><div class=\"sl\">parties<\/div><\/div>\n<div class=\"spec\"><div class=\"sv\">+150<\/div><div class=\"sl\">gain vs base<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<div class=\"article-body\">\n\n<div class=\"badge\">Gauntlet termin\u00e9 \u00b7 classement Ordo du 2 novembre 2026<\/div>\n\n<p class=\"chapeau\">Le Mephisto RISC II fait tourner le Gideon 3.1 d&#8217;Ed Schr\u00f6der sur un processeur ARM2 \u00e0 14&nbsp;MHz. \u00c9mul\u00e9 par CB-Emu (MessChess\/MAME), il est ici acc\u00e9l\u00e9r\u00e9 quatre fois (\u00d73,99&nbsp;: 80&nbsp;% du maximum mesur\u00e9 sur le PC h\u00f4te), soit l&#8217;\u00e9quivalent d&#8217;un ARM2 \u00e0 56&nbsp;MHz. Un gauntlet en \u00e9chelle l&#8217;a oppos\u00e9 \u00e0 15&nbsp;adversaires cot\u00e9s de 2170 \u00e0 2343. R\u00e9sultat Ordo&nbsp;: <strong>2374 \u00b114 sur 181 parties<\/strong>, soit 150&nbsp;points de plus que le RISC II d&#8217;origine (2224). Et une partie \u00e0 retenir&nbsp;: une chasse au Roi contre The King, l&#8217;autre programme de la carte ChessMachine.<\/p>\n\n<div class=\"chiffre-cle\">\n<div class=\"cc\"><div class=\"val\">2374<\/div><div class=\"lab\">Elo Ordo, 181 parties<\/div><\/div>\n<div class=\"cc\"><div class=\"val\">+150<\/div><div class=\"lab\">sur le RISC II d&#8217;origine (2224)<\/div><\/div>\n<div class=\"cc\"><div class=\"val\">66,9 %<\/div><div class=\"lab\">score (121 \/ 181)<\/div><\/div>\n<div class=\"cc\"><div class=\"val\">75 %<\/div><div class=\"lab\">contre lui-m\u00eame \u00e0 14 MHz<\/div><\/div>\n<\/div>\n\n<h2 class=\"sect\">1. R\u00e9sultats d\u00e9taill\u00e9s par adversaire<\/h2>\n<div class=\"tbl-wrap\"><table>\n<thead><tr><th>Adversaire<\/th><th class=\"n\">Elo<\/th><th class=\"n\">Score<\/th><th class=\"n\">%<\/th><th class=\"n\">Perf<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>MChess Pro 6 (Pentium 90 MHz)<\/td><td class=\"n\">2343<\/td><td class=\"n\">1 \/ 6<\/td><td class=\"n\">17<\/td><td class=\"n\">2063<\/td><\/tr>\n<tr><td>Gideon 3.1 ChessMachine 32 MHz<\/td><td class=\"n\">2334<\/td><td class=\"n\">3,5 \/ 6<\/td><td class=\"n\">58<\/td><td class=\"n\">2393<\/td><\/tr>\n<tr><td>The King 2.54 ChessMachine 14 MHz<\/td><td class=\"n\">2326<\/td><td class=\"n\">10 \/ 17<\/td><td class=\"n\">59<\/td><td class=\"n\">2388<\/td><\/tr>\n<tr><td>Mephisto Berlin Pro 68020<\/td><td class=\"n\">2315<\/td><td class=\"n\">5 \/ 6<\/td><td class=\"n\">83<\/td><td class=\"n\">2595<\/td><\/tr>\n<tr><td>MChess Pro 6 (486DX 33 MHz)<\/td><td class=\"n\">2278<\/td><td class=\"n\">9 \/ 17<\/td><td class=\"n\">53<\/td><td class=\"n\">2299<\/td><\/tr>\n<tr><td>Fritz 1 (Pentium 90 MHz)<\/td><td class=\"n\">2272<\/td><td class=\"n\">11 \/ 18<\/td><td class=\"n\">61<\/td><td class=\"n\">2351<\/td><\/tr>\n<tr><td>Fritz 3 (486DX 33 MHz)<\/td><td class=\"n\">2255<\/td><td class=\"n\">5,5 \/ 6<\/td><td class=\"n\">92<\/td><td class=\"n\">2671<\/td><\/tr>\n<tr><td>Fruit 2.1 (68040 40 MHz)<\/td><td class=\"n\">2254<\/td><td class=\"n\">13 \/ 17<\/td><td class=\"n\">76<\/td><td class=\"n\">2459<\/td><\/tr>\n<tr><td>Fritz 2 (Pentium 90 MHz)<\/td><td class=\"n\">2240<\/td><td class=\"n\">9 \/ 18<\/td><td class=\"n\">50<\/td><td class=\"n\">2240<\/td><\/tr>\n<tr class=\"ici\"><td>Mephisto RISC II (14 MHz, l&#x27;original)<\/td><td class=\"n\">2224<\/td><td class=\"n\">13,5 \/ 18<\/td><td class=\"n\">75<\/td><td class=\"n\">2414<\/td><\/tr>\n<tr><td>Rebel 9 (486DX 33 MHz)<\/td><td class=\"n\">2214<\/td><td class=\"n\">6 \/ 6<\/td><td class=\"n\">100<\/td><td class=\"n\">\u2014<\/td><\/tr>\n<tr><td>Rebel 6 (486DX 33 MHz)<\/td><td class=\"n\">2201<\/td><td class=\"n\">5 \/ 6<\/td><td class=\"n\">83<\/td><td class=\"n\">2481<\/td><\/tr>\n<tr><td>MChess 1.71 (486DX 33 MHz)<\/td><td class=\"n\">2188<\/td><td class=\"n\">11 \/ 17<\/td><td class=\"n\">65<\/td><td class=\"n\">2293<\/td><\/tr>\n<tr><td>Saitek Sparc (rev. 518)<\/td><td class=\"n\">2176<\/td><td class=\"n\">12,5 \/ 17<\/td><td class=\"n\">74<\/td><td class=\"n\">2354<\/td><\/tr>\n<tr><td>Fritz 2 (486DX 33 MHz)<\/td><td class=\"n\">2170<\/td><td class=\"n\">6 \/ 6<\/td><td class=\"n\">100<\/td><td class=\"n\">\u2014<\/td><\/tr>\n<tr class=\"tot\"><td>Total (adversaire moyen)<\/td><td class=\"n\">2249<\/td><td class=\"n\">121 \/ 181<\/td><td class=\"n\">67<\/td><td class=\"n\">2373<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p class=\"legende\">Cotes Ordo du 2&nbsp;novembre 2026 (<a href=\"https:\/\/www.chess.lumn.eu\/wordpress\/2026\/10\/22\/performance-elo\/\">liste maison<\/a>). Perf&nbsp;= cote de l&#8217;adversaire + 400\u00b7log<sub>10<\/sub>(p\/(1\u2212p))&nbsp;; non calculable \u00e0 0 ou 100&nbsp;%. 98&nbsp;victoires, 46&nbsp;nulles, 37&nbsp;d\u00e9faites&nbsp;; 66\/93 avec les Blancs (71&nbsp;%), 55\/88 avec les Noirs (62,5&nbsp;%). La perf totale (2373) r\u00e9sout la somme des scores attendus&nbsp;; Ordo, qui p\u00e8se toutes les parties de la liste ensemble, donne 2374.<\/p>\n\n<h2 class=\"sect\">2. Gideon \u00e0 toutes les fr\u00e9quences<\/h2>\n<p>Le laboratoire poss\u00e8de maintenant le m\u00eame programme, Gideon 3.1, sur deux supports et en cinq points de mesure&nbsp;: le module Mephisto RISC II, d\u00e9di\u00e9, \u00e0 14 et 56&nbsp;MHz, et la carte ChessMachine, branch\u00e9e dans un PC, \u00e0 14, 32 et 150&nbsp;MHz (voir <a href=\"https:\/\/www.chess.lumn.eu\/wordpress\/2026\/10\/18\/gideon-3-1-chessmachine-14-32-150-mhz\/\">l&#8217;article ChessMachine<\/a>). Toutes ces cotes viennent de la m\u00eame liste, sur la m\u00eame cadence.<\/p>\n<div class=\"fig\"><svg viewBox=\"0 0 760 330\" role=\"img\" aria-label=\"Cote Elo en fonction de la fr\u00e9quence de l'ARM2, Gideon 3.1\" style=\"width:100%;height:auto;display:block\"><line x1=\"62\" y1=\"278.0\" x2=\"740\" y2=\"278.0\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"54\" y=\"282.0\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">2100<\/text><line x1=\"62\" y1=\"241.9\" x2=\"740\" y2=\"241.9\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"54\" y=\"245.9\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">2150<\/text><line x1=\"62\" y1=\"205.8\" x2=\"740\" y2=\"205.8\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"54\" y=\"209.8\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">2200<\/text><line x1=\"62\" y1=\"169.7\" x2=\"740\" y2=\"169.7\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"54\" y=\"173.7\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">2250<\/text><line x1=\"62\" y1=\"133.6\" x2=\"740\" y2=\"133.6\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"54\" y=\"137.6\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">2300<\/text><line x1=\"62\" y1=\"97.4\" x2=\"740\" y2=\"97.4\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"54\" y=\"101.4\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">2350<\/text><line x1=\"62\" y1=\"61.3\" x2=\"740\" y2=\"61.3\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"54\" y=\"65.3\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">2400<\/text><line x1=\"62\" y1=\"25.2\" x2=\"740\" y2=\"25.2\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"54\" y=\"29.2\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">2450<\/text><line x1=\"138.2\" y1=\"18\" x2=\"138.2\" y2=\"278\" stroke=\"#e3ddd0\" stroke-width=\"1\" stroke-dasharray=\"3 4\"\/><text x=\"138.2\" y=\"296\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">14<\/text><line x1=\"325.2\" y1=\"18\" x2=\"325.2\" y2=\"278\" stroke=\"#e3ddd0\" stroke-width=\"1\" stroke-dasharray=\"3 4\"\/><text x=\"325.2\" y=\"296\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">32<\/text><line x1=\"451.9\" y1=\"18\" x2=\"451.9\" y2=\"278\" stroke=\"#e3ddd0\" stroke-width=\"1\" stroke-dasharray=\"3 4\"\/><text x=\"451.9\" y=\"296\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">56<\/text><line x1=\"674.9\" y1=\"18\" x2=\"674.9\" y2=\"278\" stroke=\"#e3ddd0\" stroke-width=\"1\" stroke-dasharray=\"3 4\"\/><text x=\"674.9\" y=\"296\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"11\" fill=\"#6b665c\">150<\/text><text x=\"401.0\" y=\"320\" text-anchor=\"middle\" font-family=\"DM Sans,sans-serif\" font-size=\"12\" fill=\"#6b665c\">Fr\u00e9quence de l&#8217;ARM2 (MHz, \u00e9chelle logarithmique)<\/text><polyline points=\"138.2,241.9 325.2,109.0 674.9,43.3\" fill=\"none\" stroke=\"#6b665c\" stroke-width=\"2.2\"\/><polyline points=\"138.2,188.4 451.9,80.1\" fill=\"none\" stroke=\"#c0392b\" stroke-width=\"2.6\"\/><circle cx=\"138.2\" cy=\"241.9\" r=\"5\" fill=\"#fffdf8\" stroke=\"#6b665c\" stroke-width=\"2\"\/><text x=\"138.2\" y=\"261.9\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"11.5\" fill=\"#6b665c\">2150<\/text><circle cx=\"325.2\" cy=\"109.0\" r=\"5\" fill=\"#fffdf8\" stroke=\"#6b665c\" stroke-width=\"2\"\/><text x=\"325.2\" y=\"129.0\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"11.5\" fill=\"#6b665c\">2334<\/text><circle cx=\"674.9\" cy=\"43.3\" r=\"5\" fill=\"#fffdf8\" stroke=\"#6b665c\" stroke-width=\"2\"\/><text x=\"674.9\" y=\"63.3\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"11.5\" fill=\"#6b665c\">2425<\/text><circle cx=\"138.2\" cy=\"188.4\" r=\"6\" fill=\"#c0392b\"\/><text x=\"138.2\" y=\"176.4\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"12\" font-weight=\"600\" fill=\"#c0392b\">2224<\/text><circle cx=\"451.9\" cy=\"80.1\" r=\"6\" fill=\"#c0392b\"\/><text x=\"451.9\" y=\"68.1\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"12\" font-weight=\"600\" fill=\"#c0392b\">2374<\/text><line x1=\"76\" y1=\"30\" x2=\"102\" y2=\"30\" stroke=\"#c0392b\" stroke-width=\"2.6\"\/><text x=\"110\" y=\"34\" font-family=\"DM Sans,sans-serif\" font-size=\"12.5\" fill=\"#2b2b2b\">Mephisto RISC II (module d\u00e9di\u00e9)<\/text><line x1=\"76\" y1=\"50\" x2=\"102\" y2=\"50\" stroke=\"#6b665c\" stroke-width=\"2.2\"\/><text x=\"110\" y=\"54\" font-family=\"DM Sans,sans-serif\" font-size=\"12.5\" fill=\"#2b2b2b\">Gideon 3.1 sur carte ChessMachine (PC)<\/text><\/svg><\/div>\n<p class=\"legende\">Cotes Ordo de la liste maison, 2&nbsp;novembre 2026 (\u00b17 \u00e0 \u00b114 selon les machines).<\/p>\n<p><strong>\u00c0 14&nbsp;MHz, le module d\u00e9di\u00e9 a 74&nbsp;points d&#8217;avance<\/strong> sur la carte (2224 contre 2150), \u00e0 processeur et fr\u00e9quence identiques. <strong>\u00c0 56&nbsp;MHz, cette avance a disparu.<\/strong> Trac\u00e9e en ligne droite entre 32 et 150&nbsp;MHz, la courbe de la carte passe par 2367 \u00e0 56&nbsp;MHz&nbsp;: le RISC II acc\u00e9l\u00e9r\u00e9 (2374) tombe pile dessus, \u00e0 7&nbsp;points pr\u00e8s, bien en dessous de la marge d&#8217;erreur.<\/p>\n<p>Autrement dit, le RISC II gagne moins \u00e0 l&#8217;acc\u00e9l\u00e9ration que la carte&nbsp;: +150 pour \u00d74, contre environ +217 pour la carte sur le m\u00eame intervalle. Les deux semblent converger vers un m\u00eame plafond, celui du programme, que la carte \u00e0 150&nbsp;MHz situe vers 2425. La carte gagne 154&nbsp;points par doublement de 14 \u00e0 32&nbsp;MHz, puis 41 seulement de 32 \u00e0 150&nbsp;MHz.<\/p>\n<div class=\"retenir\"><span class=\"mot\">Ce qu&#8217;il faut retenir<\/span>\n<p>Le RISC II gagne <strong>75 points par doublement de fr\u00e9quence<\/strong>. C&#8217;est mieux que les deux autres machines acc\u00e9l\u00e9r\u00e9es publi\u00e9es&nbsp;: le <a href=\"https:\/\/www.chess.lumn.eu\/wordpress\/2026\/10\/26\/mephisto-berlin-pro-230mhz\/\">Berlin Pro 68020<\/a> (+163 pour \u00d79,35, soit 51 par doublement) et surtout le <a href=\"https:\/\/www.chess.lumn.eu\/wordpress\/2026\/10\/25\/chess-genius-68030-240mhz\/\">Genius 68030 London<\/a> (+51 pour \u00d77,26, 18 par doublement), dont le programme sature. Le Gideon avait encore de la marge.<\/p>\n<\/div>\n\n<h2 class=\"sect\">3. Corroboration externe<\/h2>\n<p>La <a href=\"https:\/\/www.schach-computer.info\/wiki\/index.php\/Wiki-Elo-Liste\">Wiki-Elo-Liste<\/a> de schach-computer.info (\u00e9tat de d\u00e9cembre 2025) cote les machines r\u00e9elles. Elle ne conna\u00eet pas de RISC II acc\u00e9l\u00e9r\u00e9, mais elle classe toute la famille Gideon. La colonne \u00ab&nbsp;Aktiv&nbsp;\u00bb correspond \u00e0 des parties d&#8217;une demi-heure.<\/p>\n<div class=\"tbl-wrap\"><table>\n<thead><tr><th>Machine<\/th><th>Processeur<\/th><th class=\"n\">Wiki-Elo (Aktiv)<\/th><th class=\"n\">Liste maison<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Mephisto Risc 1MB<\/td><td>ARM2 14 MHz<\/td><td class=\"n\">2259<\/td><td class=\"n\">\u2014<\/td><\/tr>\n<tr class=\"ici\"><td>Mephisto Risc 2 (RISC II)<\/td><td>ARM2 14 MHz<\/td><td class=\"n\">2246<\/td><td class=\"n\">2224<\/td><\/tr>\n<tr><td>Tasc ChessMachine Gideon 3.1<\/td><td>ARM2 14 MHz<\/td><td class=\"n\">2246<\/td><td class=\"n\">2150<\/td><\/tr>\n<tr><td>Tasc R30 Gideon<\/td><td>ARM2 30 MHz<\/td><td class=\"n\">2314<\/td><td class=\"n\">\u2014<\/td><\/tr>\n<tr><td>Tasc ChessMachine Gideon 3.1<\/td><td>ARM 32 MHz<\/td><td class=\"n\">2387<\/td><td class=\"n\">2334<\/td><\/tr>\n<tr class=\"ici\"><td>Mephisto RISC II acc\u00e9l\u00e9r\u00e9<\/td><td>ARM2 \u00ab&nbsp;56 MHz&nbsp;\u00bb \u00e9mul\u00e9<\/td><td class=\"n\">\u2014<\/td><td class=\"n\">2374<\/td><\/tr>\n<tr><td>Gideon 3.1 ChessMachine acc\u00e9l\u00e9r\u00e9e<\/td><td>ARM \u00ab&nbsp;150 MHz&nbsp;\u00bb \u00e9mul\u00e9<\/td><td class=\"n\">\u2014<\/td><td class=\"n\">2425<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p class=\"legende\">Les deux listes n&#8217;ont ni la m\u00eame \u00e9chelle ni la m\u00eame cadence (15&nbsp;s par coup chez nous). On compare donc les \u00e9carts, pas les chiffres bruts.<\/p>\n<p>Pour le RISC II d&#8217;origine, les deux listes sont presque d&#8217;accord (2246 contre 2224). En revanche, la Wiki-Elo ne voit <strong>aucune diff\u00e9rence<\/strong> entre le module RISC II et la carte ChessMachine \u00e0 14&nbsp;MHz (2246 tous les deux), alors que notre liste donne 74&nbsp;points d&#8217;avance au module. L&#8217;\u00e9cart de 14 \u00e0 32&nbsp;MHz est du m\u00eame ordre des deux c\u00f4t\u00e9s&nbsp;: +141 sur la Wiki-Elo, +184 chez nous.<\/p>\n<p>Quant au <strong>Tasc R30 Gideon<\/strong>, le Gideon sur la machine d\u00e9di\u00e9e de Tasc \u00e0 30&nbsp;MHz, la Wiki-Elo le classe \u00e0 2314, soit 73&nbsp;points sous la carte \u00e0 32&nbsp;MHz. Le RISC II \u00e0 56&nbsp;MHz, lui, se range au niveau que la Wiki-Elo accorde au meilleur Gideon sur ARM (2387 pour la carte \u00e0 32&nbsp;MHz)&nbsp;: un module de s\u00e9rie, pouss\u00e9 \u00e0 une vitesse qu&#8217;il n&#8217;a jamais connue.<\/p>\n\n<h2 class=\"sect\">4. La partie la plus spectaculaire<\/h2>\n<p class=\"eyebrow\">Gauntlet du RISC II acc\u00e9l\u00e9r\u00e9 \u00b7 1<sup>er<\/sup> novembre 2026 \u00b7 cadence 60\/900<\/p>\n<div class=\"joueurs\"><span>The King 2.54 ChessMachine 14 MHz<b>2326<\/b><\/span><span>Mephisto RISC II 56 MHz<b>2374<\/b><\/span><span>0-1 en 46 coups<\/span><\/div>\n<p>Parmi les 98 victoires du gauntlet, celle-ci a tout&nbsp;: l&#8217;un des adversaires les plus forts du plateau, un sacrifice de qualit\u00e9, une chasse au Roi de g1 \u00e0 c1 et un mat au 46<sup>e<\/sup> coup. Elle a aussi une histoire. The King (Johan de Koning) et Gideon (Ed Schr\u00f6der) sont les deux programmes que Tasc vendait pour sa carte ChessMachine&nbsp;: c&#8217;est un duel de fr\u00e8res ennemis.<\/p>\n<div class=\"fig\"><svg viewBox=\"0 0 760 230\" role=\"img\" aria-label=\"\u00c9valuation Stockfish du point de vue du RISC II, demi-coup par demi-coup\" style=\"width:100%;height:auto;display:block\"><rect x=\"40\" y=\"12\" width=\"708\" height=\"96.0\" fill=\"rgba(192,57,43,.06)\"\/><line x1=\"40\" y1=\"204.0\" x2=\"748\" y2=\"204.0\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"34\" y=\"208.0\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"10.5\" fill=\"#6b665c\">-10<\/text><line x1=\"40\" y1=\"156.0\" x2=\"748\" y2=\"156.0\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"34\" y=\"160.0\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"10.5\" fill=\"#6b665c\">-5<\/text><line x1=\"40\" y1=\"108.0\" x2=\"748\" y2=\"108.0\" stroke=\"#b9b09c\" stroke-width=\"1\"\/><text x=\"34\" y=\"112.0\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"10.5\" fill=\"#6b665c\">0<\/text><line x1=\"40\" y1=\"60.0\" x2=\"748\" y2=\"60.0\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"34\" y=\"64.0\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"10.5\" fill=\"#6b665c\">+5<\/text><line x1=\"40\" y1=\"12.0\" x2=\"748\" y2=\"12.0\" stroke=\"#e3ddd0\" stroke-width=\"1\"\/><text x=\"34\" y=\"16.0\" text-anchor=\"end\" font-family=\"JetBrains Mono,monospace\" font-size=\"10.5\" fill=\"#6b665c\">+10<\/text><polyline points=\"40.0,109.0 47.8,113.3 55.6,111.0 63.3,111.4 71.1,110.3 78.9,111.8 86.7,111.0 94.5,111.8 102.2,111.3 110.0,111.9 117.8,110.6 125.6,110.6 133.4,109.9 141.1,111.1 148.9,111.1 156.7,112.7 164.5,110.6 172.3,112.8 180.0,112.3 187.8,112.5 195.6,111.1 203.4,111.6 211.2,95.0 218.9,95.8 226.7,92.2 234.5,97.0 242.3,91.2 250.1,93.6 257.8,86.8 265.6,94.8 273.4,92.9 281.2,94.3 289.0,88.0 296.7,92.6 304.5,84.3 312.3,88.6 320.1,86.7 327.9,87.2 335.6,74.4 343.4,82.0 351.2,78.7 359.0,88.2 366.8,82.5 374.5,82.9 382.3,78.7 390.1,81.8 397.9,76.6 405.7,78.9 413.5,70.6 421.2,71.6 429.0,56.4 436.8,56.3 444.6,44.4 452.4,44.9 460.1,42.8 467.9,44.1 475.7,38.9 483.5,21.9 491.3,12.0 499.0,12.0 506.8,12.0 514.6,12.0 522.4,12.0 530.2,12.0 537.9,12.0 545.7,12.0 553.5,12.0 561.3,12.0 569.1,12.0 576.8,12.0 584.6,12.0 592.4,12.0 600.2,12.0 608.0,12.0 615.7,12.0 623.5,12.0 631.3,12.0 639.1,12.0 646.9,12.0 654.6,12.0 662.4,12.0 670.2,12.0 678.0,12.0 685.8,12.0 693.5,12.0 701.3,12.0 709.1,12.0 716.9,12.0 724.7,12.0 732.4,12.0 740.2,12.0 748.0,12.0\" fill=\"none\" stroke=\"#c0392b\" stroke-width=\"2.2\"\/><line x1=\"187.8\" y1=\"12\" x2=\"187.8\" y2=\"204\" stroke=\"#b8863b\" stroke-width=\"1\" stroke-dasharray=\"2 4\"\/><text x=\"187.8\" y=\"222\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"10.5\" fill=\"#6b665c\">10<\/text><line x1=\"343.4\" y1=\"12\" x2=\"343.4\" y2=\"204\" stroke=\"#b8863b\" stroke-width=\"1\" stroke-dasharray=\"2 4\"\/><text x=\"343.4\" y=\"222\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"10.5\" fill=\"#6b665c\">20<\/text><line x1=\"483.5\" y1=\"12\" x2=\"483.5\" y2=\"204\" stroke=\"#b8863b\" stroke-width=\"1\" stroke-dasharray=\"2 4\"\/><text x=\"483.5\" y=\"222\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"10.5\" fill=\"#6b665c\">29<\/text><line x1=\"592.4\" y1=\"12\" x2=\"592.4\" y2=\"204\" stroke=\"#b8863b\" stroke-width=\"1\" stroke-dasharray=\"2 4\"\/><text x=\"592.4\" y=\"222\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"10.5\" fill=\"#6b665c\">36<\/text><line x1=\"748.0\" y1=\"12\" x2=\"748.0\" y2=\"204\" stroke=\"#b8863b\" stroke-width=\"1\" stroke-dasharray=\"2 4\"\/><text x=\"748.0\" y=\"222\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"10.5\" fill=\"#6b665c\">46<\/text><text x=\"489.5\" y=\"25.6\" font-family=\"DM Sans,sans-serif\" font-size=\"11.5\" fill=\"#c0392b\">29\u2026Txf3&nbsp;!!<\/text><text x=\"207.2\" y=\"86.6\" font-family=\"DM Sans,sans-serif\" font-size=\"11.5\" fill=\"#6b665c\">12.Ff5&nbsp;?<\/text><\/svg><\/div>\n<p class=\"legende\">\u00c9valuation Stockfish&nbsp;16 du point de vue du RISC II (Noirs) apr\u00e8s chaque demi-coup, plafonn\u00e9e \u00e0 \u00b110&nbsp;; au-del\u00e0, le mat est forc\u00e9. La zone teint\u00e9e correspond \u00e0 l&#8217;avantage des Noirs.<\/p>\n\n<h3 class=\"ssect\">La partie comment\u00e9e, coup par coup<\/h3>\n<p class=\"legende\">Les \u00e9valuations cit\u00e9es sont celles affich\u00e9es par chaque machine (de son propre point de vue) ou celles de Stockfish&nbsp;16 (environ 0,6&nbsp;s par position, point de vue des Blancs sauf mention contraire).<\/p>\n<p class=\"coup\"><span class=\"cps\">1.c4<\/span> Les deux programmes de la carte ChessMachine face \u00e0 face&nbsp;: The King de Johan de Koning (Blancs, carte \u00e0 14&nbsp;MHz) contre le Gideon&nbsp;3.1 d&#8217;Ed Schr\u00f6der, ici dans le module Mephisto RISC&nbsp;II pouss\u00e9 \u00e0 56&nbsp;MHz. Chacun joue son propre livre.<\/p>\n<p class=\"coup\"><span class=\"cps\">1\u2026c6 2.d4 d5 3.Cc3 Cf6 4.Cf3 e6 5.Fg5 h6<\/span> Les deux machines jouent encore leur livre&nbsp;: un gambit dame \u00e0 la sauce anglaise, structure Caro-Kann (c6-d5) pour les Noirs.<\/p>\n<p class=\"coup\"><span class=\"cps\">6.Fxf6 Dxf6<\/span> Le Fou g5 a disparu contre le Cavalier f6&nbsp;: les Noirs gardent la paire de Fous, les Blancs un l\u00e9ger avantage de d\u00e9veloppement.<\/p>\n<p class=\"coup\"><span class=\"cps\">7.e3 Fd6 8.Fd3<\/span> The King quitte son livre et commence \u00e0 calculer.<\/p>\n<p class=\"coup\"><span class=\"cps\">8\u2026De7 9.O-O Cd7<\/span> Dernier coup du livre du RISC&nbsp;II, jou\u00e9 en une seconde.<\/p>\n<p class=\"coup\"><span class=\"cps\">10.c5<\/span> The King ferme le centre et prend de l&#8217;espace \u00e0 l&#8217;aile dame.<\/p>\n<p class=\"coup\"><span class=\"cps\">10\u2026Fc7<\/span> Le Fou noir recule en c7, sur la diagonale b8-h2 qui m\u00e8ne droit au roque blanc&nbsp;: il y restera vingt-trois coups avant de frapper.<\/p>\n<p class=\"coup\"><span class=\"cps\">11.Dc2 e5<\/span> <b>11\u2026e5&nbsp;!<\/b> La pouss\u00e9e lib\u00e9ratrice. Le RISC&nbsp;II s&#8217;estime d\u00e9j\u00e0 l\u00e9g\u00e8rement mieux (+0,25).<\/p>\n<p class=\"coup\"><span class=\"cps\">12.Ff5<\/span> <b>12.Ff5&nbsp;?<\/b> La faute strat\u00e9gique de la partie. Le Fou s&#8217;aventure en f5 et laisse passer le pion e. Stockfish passe de +0,3 \u00e0 \u22121,3 pour les Blancs&nbsp;; il fallait <b>12.e4<\/b>. The King, lui, se croit encore \u00e0 +0,47.<\/p>\n<p class=\"coup\"><span class=\"cps\">12\u2026e4<\/span> <b>12\u2026e4.<\/b> Le pion chasse le Cavalier f3, le meilleur d\u00e9fenseur du Roi blanc. Toute la suite d\u00e9coule de ce coup&nbsp;: les Blancs n&#8217;auront plus jamais de pi\u00e8ce solide en f3.<\/p>\n<figure class=\"diag\"><div class=\"r2d\" data-f=\"r1b1k2r\/ppbnqpp1\/2p4p\/2Pp1B2\/3Pp3\/2N1PN2\/PPQ2PPP\/R4RK1 w kq - 0 13\" data-u=\"e5e4\"><\/div><figcaption>Apr\u00e8s 12\u2026e4&nbsp;: le pion e4 coupe le Roi blanc de ses d\u00e9fenseurs.<\/figcaption><\/figure>\n<p class=\"coup\"><span class=\"cps\">13.Cd2 O-O 14.Tfe1 Dg5<\/span> <b>14\u2026Dg5.<\/b> La Dame rejoint l&#8217;aile roi. Elle n&#8217;en repartira plus.<\/p>\n<p class=\"coup\"><span class=\"cps\">15.Fh3 Cf6 16.Fxc8<\/span> The King \u00e9change son dernier Fou. Il se d\u00e9barrasse du Fou c8, mais il n&#8217;aura plus aucune pi\u00e8ce pour couvrir les cases blanches autour de son Roi.<\/p>\n<p class=\"coup\"><span class=\"cps\">16\u2026Taxc8 17.Da4 a6 18.h3<\/span> <b>18.h3&nbsp;?!<\/b> Un affaiblissement de plus&nbsp;: la case g3 devient un trou. Stockfish pr\u00e9f\u00e9rait 18.f4.<\/p>\n<p class=\"coup\"><span class=\"cps\">18\u2026Tfe8 19.Db4 Tb8 20.Ca4<\/span> <b>20.Ca4&nbsp;?<\/b> Le Cavalier part \u00e0 l&#8217;autre bout de l&#8217;\u00e9chiquier, vers b6. Stockfish&nbsp;: \u22123,5 pour les Blancs.<\/p>\n<p class=\"coup\"><span class=\"cps\">20\u2026a5<\/span> <b>20\u2026a5.<\/b> Prudent. Stockfish pr\u00e9f\u00e9rait <b>20\u2026Ch5<\/b>, en route vers f4&nbsp;: le RISC&nbsp;II n&#8217;est pas parfait, il rend pr\u00e8s d&#8217;un pion d&#8217;\u00e9valuation.<\/p>\n<p class=\"coup\"><span class=\"cps\">21.Db3 Cd7 22.Tac1 Te6<\/span> <b>22\u2026Te6.<\/b> La Tour se pr\u00e9pare \u00e0 basculer sur la 6<sup>e<\/sup> rang\u00e9e, vers g6 ou f6.<\/p>\n<p class=\"coup\"><span class=\"cps\">23.f4<\/span> <b>23.f4&nbsp;?<\/b> The King veut chasser le pion e4 \u00e0 tout prix. Mais apr\u00e8s la prise en passant, la colonne f s&#8217;ouvre devant son propre Roi.<\/p>\n<p class=\"coup\"><span class=\"cps\">23\u2026exf3<\/span> Prise en passant&nbsp;: le pion e4 dispara\u00eet, mais il a fait son travail.<\/p>\n<p class=\"coup\"><span class=\"cps\">24.Cxf3 Dg3<\/span> <b>24\u2026Dg3&nbsp;!<\/b> La Dame s&#8217;installe dans le trou cr\u00e9\u00e9 par 18.h3, \u00e0 deux cases du Roi blanc. The King, lui, n&#8217;\u00e9value sa position qu&#8217;\u00e0 \u22121,5.<\/p>\n<figure class=\"diag\"><div class=\"r2d\" data-f=\"1r4k1\/1pbn1pp1\/2p1r2p\/p1Pp4\/N2P4\/1Q2PNqP\/PP4P1\/2R1R1K1 w - - 1 25\" data-u=\"g5g3\"><\/div><figcaption>Apr\u00e8s 24\u2026Dg3&nbsp;!&nbsp;: la Dame noire est install\u00e9e dans le trou de g3.<\/figcaption><\/figure>\n<p class=\"coup\"><span class=\"cps\">25.Tc2 Cf6 26.Tce2<\/span> <b>26.Tce2.<\/b> Les Tours blanches tournent en rond. Stockfish&nbsp;: \u22125,4 pour les Blancs, The King&nbsp;: \u22121,36. L&#8217;\u00e9cart entre les deux montre tout ce que The King ne voit pas.<\/p>\n<p class=\"coup\"><span class=\"cps\">26\u2026Ce4<\/span> Le Cavalier entre en e4, d&#8217;o\u00f9 il menace de sauter en g5.<\/p>\n<p class=\"coup\"><span class=\"cps\">27.Cc3 Cg5<\/span> <b>27\u2026Cg5&nbsp;!<\/b> Le Cavalier vise f3 et h3. Toute la d\u00e9fense blanche repose d\u00e9sormais sur le Cavalier f3. Le RISC&nbsp;II passe \u00e0 +2,45.<\/p>\n<p class=\"coup\"><span class=\"cps\">28.Tf1 Tf6<\/span> <b>28\u2026Tf6&nbsp;!<\/b> La Tour arrive par la 6<sup>e<\/sup> rang\u00e9e, en batterie contre f3&nbsp;: le Cavalier f3 est attaqu\u00e9 deux fois. Le RISC&nbsp;II annonce +4,34.<\/p>\n<figure class=\"diag\"><div class=\"r2d\" data-f=\"1r4k1\/1pb2pp1\/2p2r1p\/p1Pp2n1\/3P4\/1QN1PNqP\/PP2R1P1\/5RK1 w - - 9 29\" data-u=\"e6f6\"><\/div><figcaption>Apr\u00e8s 28\u2026Tf6&nbsp;!&nbsp;: la Tour et le Cavalier g5 visent tous deux f3.<\/figcaption><\/figure>\n<p class=\"coup\"><span class=\"cps\">29.Cxd5<\/span> <b>29.Cxd5.<\/b> The King prend un pion en mena\u00e7ant la Tour f6 et le Fou c7&nbsp;: c&#8217;est le meilleur coup selon Stockfish, mais la position est d\u00e9j\u00e0 perdue.<\/p>\n<p class=\"coup\"><span class=\"cps\">29\u2026Txf3<\/span> <b>29\u2026Txf3&nbsp;!!<\/b> Le RISC&nbsp;II rend la qualit\u00e9 (la Tour contre le Cavalier) pour \u00e9liminer le dernier d\u00e9fenseur du Roi blanc. Il annonce +5,12&nbsp;; Stockfish confirme \u22129 pour les Blancs.<\/p>\n<p class=\"coup\"><span class=\"cps\">30.Txf3<\/span> Reprise forc\u00e9e. The King, \u00e0 43&nbsp;secondes de r\u00e9flexion, ne voit que \u22125,78.<\/p>\n<p class=\"coup\"><span class=\"cps\">30\u2026Dh2+<\/span> <b>30\u2026Dh2+&nbsp;!<\/b> La Dame entre dans le roque. Commence une chasse au Roi qui va traverser tout l&#8217;\u00e9chiquier, de g1 \u00e0 c1.<\/p>\n<figure class=\"diag\"><div class=\"r2d\" data-f=\"1r4k1\/1pb2pp1\/2p4p\/p1PN2n1\/3P4\/1Q2PR1P\/PP2R1Pq\/6K1 w - - 1 31\" data-u=\"g3h2\"><\/div><figcaption>Apr\u00e8s 29\u2026Txf3&nbsp;!! 30.Txf3 Dh2+&nbsp;: la chasse au Roi commence.<\/figcaption><\/figure>\n<p class=\"coup\"><span class=\"cps\">31.Rf2 Ce4+<\/span> <b>31\u2026Ce4+.<\/b> Le Cavalier revient au centre avec \u00e9chec.<\/p>\n<p class=\"coup\"><span class=\"cps\">32.Re1 Dg1+<\/span> <b>32\u2026Dg1+.<\/b> Le Roi blanc est sorti de son roque&nbsp;; la Dame noire est derri\u00e8re lui.<\/p>\n<p class=\"coup\"><span class=\"cps\">33.Tf1 Fg3+<\/span> <b>33\u2026Fg3+&nbsp;!<\/b> Le Fou c7, immobile depuis le 10<sup>e<\/sup> coup, traverse enfin la diagonale b8-h2.<\/p>\n<p class=\"coup\"><span class=\"cps\">34.Tf2 Fxf2+<\/span> <b>34\u2026Fxf2+.<\/b> Le Fou reprend la Tour&nbsp;: les Noirs passent devant au mat\u00e9riel, et le Roi blanc est toujours \u00e0 d\u00e9couvert.<\/p>\n<p class=\"coup\"><span class=\"cps\">35.Re2 Cg3+<\/span> <b>35\u2026Cg3+.<\/b> Le Roi blanc doit choisir entre f3 et l&#8217;aile dame.<\/p>\n<figure class=\"diag\"><div class=\"r2d\" data-f=\"1r4k1\/1p3pp1\/2p4p\/p1PN4\/3P4\/1Q2P1nP\/PP2KbP1\/5Rq1 w - - 2 36\" data-u=\"e4g3\"><\/div><figcaption>Apr\u00e8s 35\u2026Cg3+&nbsp;: le Roi blanc, sorti de son roque, est pris entre la Dame g1, le Fou f2 et le Cavalier g3.<\/figcaption><\/figure>\n<p class=\"coup\"><span class=\"cps\">36.Rf3<\/span> <b>36.Rf3&nbsp;?<\/b> Le Roi s&#8217;avance vers ses assaillants&nbsp;: apr\u00e8s 36\u2026Dxf1, Stockfish annonce un mat forc\u00e9. <b>36.Rd2<\/b> durait plus longtemps.<\/p>\n<p class=\"coup\"><span class=\"cps\">36\u2026Dxf1<\/span> <b>36\u2026Dxf1.<\/b> La Dame ramasse la derni\u00e8re Tour blanche&nbsp;: les Noirs ont sept points de mat\u00e9riel d&#8217;avance, et le mat approche.<\/p>\n<p class=\"coup\"><span class=\"cps\">37.Cf4 Fxe3+<\/span> <b>37\u2026Fxe3+&nbsp;!<\/b> Le Fou se sacrifie pour ouvrir la colonne e. Stockfish pr\u00e9f\u00e9rait 37\u2026Te8, qui mate un peu plus vite&nbsp;; les deux gagnent.<\/p>\n<p class=\"coup\"><span class=\"cps\">38.Rxe3 Te8+<\/span> <b>38\u2026Te8+.<\/b> La Tour b8 arrive sur la colonne ouverte.<\/p>\n<p class=\"coup\"><span class=\"cps\">39.De6<\/span> <b>39.De6.<\/b> The King donne sa Dame pour retarder le mat.<\/p>\n<p class=\"coup\"><span class=\"cps\">39\u2026Txe6+<\/span> Le RISC&nbsp;II reprend la Dame avec \u00e9chec.<\/p>\n<p class=\"coup\"><span class=\"cps\">40.Rd2 Ce4+<\/span> Le Cavalier revient en e4 avec \u00e9chec. Le Roi blanc est pouss\u00e9 vers l&#8217;aile dame.<\/p>\n<p class=\"coup\"><span class=\"cps\">41.Rc2 Dc4+ 42.Rd1 Cf2+ 43.Rd2 Dxd4+<\/span> <b>43\u2026Dxd4+.<\/b> Le pion d4 tombe avec \u00e9chec.<\/p>\n<p class=\"coup\"><span class=\"cps\">44.Rc2 Te2+<\/span> <b>44\u2026Te2+&nbsp;!<\/b> Encore un sacrifice&nbsp;: la Tour se donne pour d\u00e9vier le Cavalier f4, qui gardait la case d3.<\/p>\n<p class=\"coup\"><span class=\"cps\">45.Cxe2 Dd3+ 46.Rc1 Dd1#<\/span> <b>46\u2026Dd1#.<\/b> Mat. Le Roi blanc, chass\u00e9 de g1 \u00e0 c1 \u00e0 travers tout l&#8217;\u00e9chiquier, tombe sous la Dame noire, prot\u00e9g\u00e9e par le Cavalier f2. Partie jou\u00e9e en 16&nbsp;minutes.<\/p>\n<figure class=\"diag\"><div class=\"r2d\" data-f=\"6k1\/1p3pp1\/2p4p\/p1P5\/8\/7P\/PP2NnP1\/2Kq4 w - - 3 47\" data-u=\"d3d1\"><\/div><figcaption>Position finale&nbsp;: 46\u2026Dd1#.<\/figcaption><\/figure>\n\n<h3 class=\"ssect\">Rejouer la partie<\/h3>\n<div class=\"rejeu\" id=\"r2-rejeu\">\n<div>\n<div id=\"r2-board\"><\/div>\n<div class=\"rj-ctrl\">\n<button type=\"button\" id=\"r2-deb\" aria-label=\"D\u00e9but\">\u23ee<\/button>\n<button type=\"button\" id=\"r2-prec\" aria-label=\"Coup pr\u00e9c\u00e9dent\">\u25c0<\/button>\n<button type=\"button\" id=\"r2-suiv\" aria-label=\"Coup suivant\">\u25b6<\/button>\n<button type=\"button\" id=\"r2-fin\" aria-label=\"Fin\">\u23ed<\/button>\n<span class=\"rj-pos\" id=\"r2-pos\"><\/span>\n<\/div>\n<\/div>\n<div>\n<div class=\"rj-com\" id=\"r2-com\" aria-live=\"polite\"><\/div>\n<div class=\"rj-liste\" id=\"r2-liste\"><\/div>\n<\/div>\n<\/div>\n<p class=\"legende\">Cliquez un coup, ou utilisez les fl\u00e8ches \u2190 \u2192 du clavier une fois l&#8217;\u00e9chiquier survol\u00e9. Les coups en gras sont comment\u00e9s. Sous chaque commentaire&nbsp;: l&#8217;\u00e9valuation affich\u00e9e par la machine qui vient de jouer, et celle de Stockfish du point de vue du RISC II.<\/p>\n\n<h2 class=\"sect\">5. Observations notables<\/h2>\n<h3 class=\"ssect\">75 % contre lui-m\u00eame<\/h3>\n<p>Face au RISC II d&#8217;origine, la version acc\u00e9l\u00e9r\u00e9e marque 13,5\/18 (perf 2414). C&#8217;est le m\u00eame programme, le m\u00eame livre et la m\u00eame ROM&nbsp;: seul le temps de calcul change, multipli\u00e9 par quatre.<\/p>\n<h3 class=\"ssect\">Les PC \u00e9mul\u00e9s \u00e0 90 MHz r\u00e9sistent mieux que les 486<\/h3>\n<p>Le RISC II \u00e9crase la plupart des programmes DOS sur 486 \u00e0 33&nbsp;MHz&nbsp;: 6\/6 contre Fritz&nbsp;2, 6\/6 contre Rebel&nbsp;9, 5,5\/6 contre Fritz&nbsp;3 (MChess Pro&nbsp;6 fait exception, 9\/17). Sur Pentium 90, la r\u00e9sistance est plus forte&nbsp;: le RISC II ne fait que 9\/18 contre Fritz&nbsp;2, 11\/18 contre Fritz&nbsp;1 et 1\/6 contre MChess Pro&nbsp;6, son pire r\u00e9sultat du gauntlet.<\/p>\n<h3 class=\"ssect\">Face aux ChessMachine<\/h3>\n<p>Contre The King 2.54 \u00e0 14&nbsp;MHz, il fait 10\/17 (59&nbsp;%), et 3,5\/6 (58&nbsp;%) contre son propre programme sur la carte \u00e0 32&nbsp;MHz. Le Gideon 3.1 \u00e0 56&nbsp;MHz ne bat donc que de peu le Gideon 3.1 \u00e0 32&nbsp;MHz, ce qui est coh\u00e9rent avec la courbe de la section&nbsp;2.<\/p>\n<h3 class=\"ssect\">Des parties en double<\/h3>\n<p>Les deux machines jouent leur propre livre et ne tirent rien au hasard&nbsp;: 19&nbsp;parties sont identiques coup pour coup \u00e0 une autre. Sans elles, la performance passe de 2373 \u00e0 environ 2369 sur 162&nbsp;parties. L&#8217;effet est n\u00e9gligeable, et Ordo garde toutes les parties.<\/p>\n\n<h2 class=\"sect\">6. M\u00e9thodologie<\/h2>\n<h3 class=\"ssect\">\u00c9mulation<\/h3>\n<p>Pilote MAME <code>mrisc2<\/code> sous MessChess, avec le greffon chessengine de CB-Emu et le relais UCI du laboratoire. La vitesse maximale du RISC II sur le Ryzen 9 7950X3D est de \u00d74,99 (m\u00e9diane de 9&nbsp;mesures de 60&nbsp;s, 8&nbsp;\u00e9mulations en parall\u00e8le, 28\/09\/2026). La version acc\u00e9l\u00e9r\u00e9e tourne \u00e0 80&nbsp;% de ce maximum, \u00d73,99&nbsp;: d&#8217;o\u00f9 les 56&nbsp;MHz (14&nbsp;\u00d7 3,99). La machine r\u00e9fl\u00e9chit en analyse infinie et le relais l&#8217;arr\u00eate au bout du temps allou\u00e9 par la pendule.<\/p>\n<h3 class=\"ssect\">Gauntlet<\/h3>\n<p>\u00c9chelle d&#8217;adversaires de la liste maison, 6&nbsp;parties par marche en alternant les couleurs, arr\u00eat de l&#8217;\u00e9chelle au premier score sous 25&nbsp;%, puis compl\u00e9ment contre les adversaires entre 25 et 75&nbsp;%. Cadence 60&nbsp;coups en 15&nbsp;minutes, livres propres de chaque machine, cutechess-cli, plusieurs parties en m\u00eame temps.<\/p>\n<div class=\"box alerte\"><span class=\"box-titre\">Vitesse tenue&nbsp;: non v\u00e9rifi\u00e9e pour ce gauntlet<\/span>\n<p>Les journaux du relais \u00e9taient coup\u00e9s pendant ce gauntlet&nbsp;: ils remplissaient le disque. On ne peut donc pas certifier que les \u00d73,99 ont \u00e9t\u00e9 tenus \u00e0 chaque coup. La marge de 20&nbsp;% sous le maximum mesur\u00e9, les r\u00e9glages Windows (mode Haute performance, priorit\u00e9 au-dessus de la normale, minuterie fine) et le bon r\u00e9sultat contre le RISC II d&#8217;origine plaident pour, sans le prouver. Depuis le 1<sup>er<\/sup>&nbsp;novembre, le relais \u00e9crit une ligne de vitesse par partie, m\u00eame journaux coup\u00e9s&nbsp;: les prochains gauntlets acc\u00e9l\u00e9r\u00e9s seront contr\u00f4l\u00e9s.<\/p>\n<\/div>\n\n<h2 class=\"sect\">7. Conclusion<\/h2>\n<div class=\"box\"><span class=\"box-titre\">R\u00e9sultat d\u00e9finitif<\/span>\n<p><strong>Mephisto RISC II \u00e0 56&nbsp;MHz&nbsp;: 2374 \u00b114 Elo<\/strong> (Ordo, 181&nbsp;parties), 150&nbsp;points au-dessus du module d&#8217;origine. Quadrupler la fr\u00e9quence rapporte 75&nbsp;points par doublement, bien plus qu&#8217;au Genius 68030. \u00c0 56&nbsp;MHz, le module d\u00e9di\u00e9 rejoint la courbe de la carte ChessMachine&nbsp;: le Gideon 3.1 approche de son plafond, autour de 2425.<\/p>\n<\/div>\n\n<hr>\n<h3 class=\"ssect\">Sources<\/h3>\n<ul class=\"sources\">\n<li>Liste maison&nbsp;: <a href=\"https:\/\/www.chess.lumn.eu\/wordpress\/2026\/10\/22\/performance-elo\/\">Performance Elo, tournois maison<\/a> (Ordo, 2&nbsp;novembre 2026).<\/li>\n<li>Wiki-Elo-Liste, schach-computer.info, \u00e9tat de d\u00e9cembre 2025&nbsp;: <a href=\"https:\/\/www.schach-computer.info\/wiki\/index.php\/Wiki-Elo-Liste\">Wiki-Elo-Liste<\/a>.<\/li>\n<li>Articles du laboratoire&nbsp;: <a href=\"https:\/\/www.chess.lumn.eu\/wordpress\/2026\/10\/18\/gideon-3-1-chessmachine-14-32-150-mhz\/\">Gideon 3.1 sur ChessMachine<\/a>, <a href=\"https:\/\/www.chess.lumn.eu\/wordpress\/2026\/10\/18\/the-king-2-54-chessmachine-14-32-140-mhz\/\">The King 2.54 sur ChessMachine<\/a>, <a href=\"https:\/\/www.chess.lumn.eu\/wordpress\/2026\/10\/25\/chess-genius-68030-240mhz\/\">Genius 68030 \u00e0 240 MHz<\/a>, <a href=\"https:\/\/www.chess.lumn.eu\/wordpress\/2026\/10\/26\/mephisto-berlin-pro-230mhz\/\">Berlin Pro \u00e0 230 MHz<\/a>.<\/li>\n<li>Partie&nbsp;: PGN du gauntlet (cutechess-cli). Analyses de contr\u00f4le&nbsp;: Stockfish 16.<\/li>\n<\/ul>\n<p class=\"sig\">chess.lumn.eu \u00b7 laboratoire \u00b7 novembre 2026<\/p>\n<\/div>\n<script>\n(function(){\nvar R = [{\"f\": \"rnbqkbnr\/pppppppp\/8\/8\/2P5\/8\/PP1PPPPP\/RNBQKBNR b KQkq - 0 1\", \"s\": \"c4\", \"u\": \"c2c4\", \"w\": true, \"n\": 1, \"c\": \"Les deux programmes de la carte ChessMachine face \u00e0 face&nbsp;: The King de Johan de Koning (Blancs, carte \u00e0 14&nbsp;MHz) contre le Gideon&nbsp;3.1 d'Ed Schr\u00f6der, ici dans le module Mephisto RISC&nbsp;II pouss\u00e9 \u00e0 56&nbsp;MHz. 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0 7\", \"s\": \"Dxf6\", \"u\": \"d8f6\", \"w\": false, \"n\": 6, \"c\": \"Le Fou g5 a disparu contre le Cavalier f6&nbsp;: les Noirs gardent la paire de Fous, les Blancs un l\u00e9ger avantage de d\u00e9veloppement.\", \"m\": \"0,00 (prof. 1, 1,4 s)\", \"sf\": \"\u22120,27\"}, {\"f\": \"rnb1kb1r\/pp3pp1\/2p1pq1p\/3p4\/2PP4\/2N1PN2\/PP3PPP\/R2QKB1R b KQkq - 0 7\", \"s\": \"e3\", \"u\": \"e2e3\", \"w\": true, \"n\": 7, \"c\": \"\", \"m\": \"livre\", \"sf\": \"\u22120,20\"}, {\"f\": \"rnb1k2r\/pp3pp1\/2pbpq1p\/3p4\/2PP4\/2N1PN2\/PP3PPP\/R2QKB1R w KQkq - 1 8\", \"s\": \"Fd6\", \"u\": \"f8d6\", \"w\": false, \"n\": 7, \"c\": \"\", \"m\": \"0,00 (prof. 1, 1,4 s)\", \"sf\": \"\u22120,32\"}, {\"f\": \"rnb1k2r\/pp3pp1\/2pbpq1p\/3p4\/2PP4\/2NBPN2\/PP3PPP\/R2QK2R b KQkq - 2 8\", \"s\": \"Fd3\", \"u\": \"f1d3\", \"w\": true, \"n\": 8, \"c\": \"The King quitte son livre et commence \u00e0 calculer.\", \"m\": \"+0,63 (prof. 5, 14 s)\", \"sf\": \"\u22120,32\"}, {\"f\": \"rnb1k2r\/pp2qpp1\/2pbp2p\/3p4\/2PP4\/2NBPN2\/PP3PPP\/R2QK2R w KQkq - 3 9\", \"s\": \"De7\", \"u\": \"f6e7\", \"w\": false, \"n\": 8, \"c\": \"\", \"m\": \"0,00 (prof. 1, 0,8 s)\", \"sf\": \"\u22120,49\"}, {\"f\": \"rnb1k2r\/pp2qpp1\/2pbp2p\/3p4\/2PP4\/2NBPN2\/PP3PPP\/R2Q1RK1 b kq - 4 9\", \"s\": \"O-O\", \"u\": \"e1g1\", \"w\": true, \"n\": 9, \"c\": \"\", \"m\": \"+0,72 (prof. 6, 18 s)\", \"sf\": \"\u22120,27\"}, {\"f\": \"r1b1k2r\/pp1nqpp1\/2pbp2p\/3p4\/2PP4\/2NBPN2\/PP3PPP\/R2Q1RK1 w kq - 5 10\", \"s\": \"Cd7\", \"u\": \"b8d7\", \"w\": false, \"n\": 9, \"c\": \"Dernier coup du livre du RISC&nbsp;II, jou\u00e9 en une seconde.\", \"m\": \"livre ou coup imm\u00e9diat (1,2 s)\", \"sf\": \"\u22120,50\"}, {\"f\": \"r1b1k2r\/pp1nqpp1\/2pbp2p\/2Pp4\/3P4\/2NBPN2\/PP3PPP\/R2Q1RK1 b kq - 0 10\", \"s\": \"c5\", \"u\": \"c4c5\", \"w\": true, \"n\": 10, \"c\": \"The King ferme le centre et prend de l'espace \u00e0 l'aile dame.\", \"m\": \"+0,73 (prof. 5, 13 s)\", \"sf\": \"\u22120,45\"}, {\"f\": \"r1b1k2r\/ppbnqpp1\/2p1p2p\/2Pp4\/3P4\/2NBPN2\/PP3PPP\/R2Q1RK1 w kq - 1 11\", \"s\": \"Fc7\", \"u\": \"d6c7\", \"w\": false, \"n\": 10, \"c\": \"Le Fou noir recule en c7, sur la diagonale b8-h2 qui m\u00e8ne droit au roque blanc&nbsp;: il y restera vingt-trois coups avant de frapper.\", \"m\": \"\u22120,14 (prof. 3, 17 s)\", \"sf\": \"\u22120,47\"}, {\"f\": \"r1b1k2r\/ppbnqpp1\/2p1p2p\/2Pp4\/3P4\/2NBPN2\/PPQ2PPP\/R4RK1 b kq - 2 11\", \"s\": \"Dc2\", \"u\": \"d1c2\", \"w\": true, \"n\": 11, \"c\": \"\", \"m\": \"+0,56 (prof. 5, 16 s)\", \"sf\": \"\u22120,32\"}, {\"f\": \"r1b1k2r\/ppbnqpp1\/2p4p\/2Ppp3\/3P4\/2NBPN2\/PPQ2PPP\/R4RK1 w kq - 0 12\", \"s\": \"e5\", \"u\": \"e6e5\", \"w\": false, \"n\": 11, \"c\": \"<b>11\u2026e5&nbsp;!<\/b> La pouss\u00e9e lib\u00e9ratrice. Le RISC&nbsp;II s'estime d\u00e9j\u00e0 l\u00e9g\u00e8rement mieux (+0,25).\", \"m\": \"+0,25 (prof. 3, 16 s)\", \"sf\": \"\u22120,37\"}, {\"f\": \"r1b1k2r\/ppbnqpp1\/2p4p\/2PppB2\/3P4\/2N1PN2\/PPQ2PPP\/R4RK1 b kq - 1 12\", \"s\": \"Ff5\", \"u\": \"d3f5\", \"w\": true, \"n\": 12, \"c\": \"<b>12.Ff5&nbsp;?<\/b> La faute strat\u00e9gique de la partie. Le Fou s'aventure en f5 et laisse passer le pion e. Stockfish passe de +0,3 \u00e0 \u22121,3 pour les Blancs&nbsp;; il fallait <b>12.e4<\/b>. The King, lui, se croit encore \u00e0 +0,47.\", \"m\": \"+0,47 (prof. 5, 14 s)\", \"sf\": \"+1,35\"}, {\"f\": \"r1b1k2r\/ppbnqpp1\/2p4p\/2Pp1B2\/3Pp3\/2N1PN2\/PPQ2PPP\/R4RK1 w kq - 0 13\", \"s\": \"e4\", \"u\": \"e5e4\", \"w\": false, \"n\": 12, \"c\": \"<b>12\u2026e4.<\/b> Le pion chasse le Cavalier f3, le meilleur d\u00e9fenseur du Roi blanc. Toute la suite d\u00e9coule de ce coup&nbsp;: les Blancs n'auront plus jamais de pi\u00e8ce solide en f3.\", \"m\": \"+0,29 (prof. 3, 17 s)\", \"sf\": \"+1,27\"}, {\"f\": \"r1b1k2r\/ppbnqpp1\/2p4p\/2Pp1B2\/3Pp3\/2N1P3\/PPQN1PPP\/R4RK1 b kq - 1 13\", \"s\": \"Cd2\", \"u\": \"f3d2\", \"w\": true, \"n\": 13, \"c\": \"\", \"m\": \"+0,06 (prof. 5, 14 s)\", \"sf\": \"+1,65\"}, {\"f\": \"r1b2rk1\/ppbnqpp1\/2p4p\/2Pp1B2\/3Pp3\/2N1P3\/PPQN1PPP\/R4RK1 w - - 2 14\", \"s\": \"O-O\", \"u\": \"e8g8\", \"w\": false, \"n\": 13, \"c\": \"\", \"m\": \"+0,32 (prof. 3, 17 s)\", \"sf\": \"+1,15\"}, {\"f\": \"r1b2rk1\/ppbnqpp1\/2p4p\/2Pp1B2\/3Pp3\/2N1P3\/PPQN1PPP\/R3R1K1 b - - 3 14\", \"s\": \"Tfe1\", \"u\": \"f1e1\", \"w\": true, \"n\": 14, \"c\": \"\", \"m\": \"+0,02 (prof. 5, 15 s)\", \"sf\": \"+1,75\"}, {\"f\": \"r1b2rk1\/ppbn1pp1\/2p4p\/2Pp1Bq1\/3Pp3\/2N1P3\/PPQN1PPP\/R3R1K1 w - - 4 15\", \"s\": \"Dg5\", \"u\": \"e7g5\", \"w\": false, \"n\": 14, \"c\": \"<b>14\u2026Dg5.<\/b> La Dame rejoint l'aile roi. Elle n'en repartira plus.\", \"m\": \"+0,35 (prof. 3, 17 s)\", \"sf\": \"+1,50\"}, {\"f\": \"r1b2rk1\/ppbn1pp1\/2p4p\/2Pp2q1\/3Pp3\/2N1P2B\/PPQN1PPP\/R3R1K1 b - - 5 15\", \"s\": \"Fh3\", \"u\": \"f5h3\", \"w\": true, \"n\": 15, \"c\": \"\", \"m\": \"\u22121,04 (prof. 6, 16 s)\", \"sf\": \"+2,21\"}, {\"f\": \"r1b2rk1\/ppb2pp1\/2p2n1p\/2Pp2q1\/3Pp3\/2N1P2B\/PPQN1PPP\/R3R1K1 w - - 6 16\", \"s\": \"Cf6\", \"u\": \"d7f6\", \"w\": false, \"n\": 15, \"c\": \"\", \"m\": \"+0,34 (prof. 3, 17 s)\", \"sf\": \"+1,38\"}, {\"f\": \"r1B2rk1\/ppb2pp1\/2p2n1p\/2Pp2q1\/3Pp3\/2N1P3\/PPQN1PPP\/R3R1K1 b - - 0 16\", \"s\": \"Fxc8\", \"u\": \"h3c8\", \"w\": true, \"n\": 16, \"c\": \"The King \u00e9change son dernier Fou. Il se d\u00e9barrasse du Fou c8, mais il n'aura plus aucune pi\u00e8ce pour couvrir les cases blanches autour de son Roi.\", \"m\": \"\u22121,03 (prof. 6, 16 s)\", \"sf\": \"+1,57\"}, {\"f\": \"2r2rk1\/ppb2pp1\/2p2n1p\/2Pp2q1\/3Pp3\/2N1P3\/PPQN1PPP\/R3R1K1 w - - 0 17\", \"s\": \"Taxc8\", \"u\": \"a8c8\", \"w\": false, \"n\": 16, \"c\": \"\", \"m\": \"+0,34 (prof. 3, 16 s)\", \"sf\": \"+1,43\"}, {\"f\": \"2r2rk1\/ppb2pp1\/2p2n1p\/2Pp2q1\/Q2Pp3\/2N1P3\/PP1N1PPP\/R3R1K1 b - - 1 17\", \"s\": \"Da4\", \"u\": \"c2a4\", \"w\": true, \"n\": 17, \"c\": \"\", \"m\": \"\u22121,03 (prof. 5, 12 s)\", \"sf\": \"+2,08\"}, {\"f\": \"2r2rk1\/1pb2pp1\/p1p2n1p\/2Pp2q1\/Q2Pp3\/2N1P3\/PP1N1PPP\/R3R1K1 w - - 0 18\", \"s\": \"a6\", \"u\": \"a7a6\", \"w\": false, \"n\": 17, \"c\": \"\", \"m\": \"+0,40 (prof. 3, 17 s)\", \"sf\": \"+1,60\"}, {\"f\": \"2r2rk1\/1pb2pp1\/p1p2n1p\/2Pp2q1\/Q2Pp3\/2N1P2P\/PP1N1PP1\/R3R1K1 b - - 0 18\", \"s\": \"h3\", \"u\": \"h2h3\", \"w\": true, \"n\": 18, \"c\": \"<b>18.h3&nbsp;?!<\/b> Un affaiblissement de plus&nbsp;: la case g3 devient un trou. Stockfish pr\u00e9f\u00e9rait 18.f4.\", \"m\": \"+0,19 (prof. 5, 16 s)\", \"sf\": \"+2,47\"}, {\"f\": \"2r1r1k1\/1pb2pp1\/p1p2n1p\/2Pp2q1\/Q2Pp3\/2N1P2P\/PP1N1PP1\/R3R1K1 w - - 1 19\", \"s\": \"Tfe8\", \"u\": \"f8e8\", \"w\": false, \"n\": 18, \"c\": \"\", \"m\": \"+0,41 (prof. 3, 17 s)\", \"sf\": \"+2,02\"}, {\"f\": \"2r1r1k1\/1pb2pp1\/p1p2n1p\/2Pp2q1\/1Q1Pp3\/2N1P2P\/PP1N1PP1\/R3R1K1 b - - 2 19\", \"s\": \"Db4\", \"u\": \"a4b4\", \"w\": true, \"n\": 19, \"c\": \"\", \"m\": \"+0,08 (prof. 6, 18 s)\", \"sf\": \"+2,22\"}, {\"f\": \"1r2r1k1\/1pb2pp1\/p1p2n1p\/2Pp2q1\/1Q1Pp3\/2N1P2P\/PP1N1PP1\/R3R1K1 w - - 3 20\", \"s\": \"Tb8\", \"u\": \"c8b8\", \"w\": false, \"n\": 19, \"c\": \"\", \"m\": \"+0,47 (prof. 3, 17 s)\", \"sf\": \"+2,17\"}, {\"f\": \"1r2r1k1\/1pb2pp1\/p1p2n1p\/2Pp2q1\/NQ1Pp3\/4P2P\/PP1N1PP1\/R3R1K1 b - - 4 20\", \"s\": \"Ca4\", \"u\": \"c3a4\", \"w\": true, \"n\": 20, \"c\": \"<b>20.Ca4&nbsp;?<\/b> Le Cavalier part \u00e0 l'autre bout de l'\u00e9chiquier, vers b6. Stockfish&nbsp;: \u22123,5 pour les Blancs.\", \"m\": \"+0,09 (prof. 5, 14 s)\", \"sf\": \"+3,50\"}, {\"f\": \"1r2r1k1\/1pb2pp1\/2p2n1p\/p1Pp2q1\/NQ1Pp3\/4P2P\/PP1N1PP1\/R3R1K1 w - - 0 21\", \"s\": \"a5\", \"u\": \"a6a5\", \"w\": false, \"n\": 20, \"c\": \"<b>20\u2026a5.<\/b> Prudent. Stockfish pr\u00e9f\u00e9rait <b>20\u2026Ch5<\/b>, en route vers f4&nbsp;: le RISC&nbsp;II n'est pas parfait, il rend pr\u00e8s d'un pion d'\u00e9valuation.\", \"m\": \"+0,43 (prof. 3, 16 s)\", \"sf\": \"+2,71\"}, {\"f\": \"1r2r1k1\/1pb2pp1\/2p2n1p\/p1Pp2q1\/N2Pp3\/1Q2P2P\/PP1N1PP1\/R3R1K1 b - - 1 21\", \"s\": \"Db3\", \"u\": \"b4b3\", \"w\": true, \"n\": 21, \"c\": \"\", \"m\": \"+0,05 (prof. 6, 11 s)\", \"sf\": \"+3,05\"}, {\"f\": \"1r2r1k1\/1pbn1pp1\/2p4p\/p1Pp2q1\/N2Pp3\/1Q2P2P\/PP1N1PP1\/R3R1K1 w - - 2 22\", \"s\": \"Cd7\", \"u\": \"f6d7\", \"w\": false, \"n\": 21, \"c\": \"\", \"m\": \"+0,42 (prof. 3, 17 s)\", \"sf\": \"+2,06\"}, {\"f\": \"1r2r1k1\/1pbn1pp1\/2p4p\/p1Pp2q1\/N2Pp3\/1Q2P2P\/PP1N1PP1\/2R1R1K1 b - - 3 22\", \"s\": \"Tac1\", \"u\": \"a1c1\", \"w\": true, \"n\": 22, \"c\": \"\", \"m\": \"\u22121,07 (prof. 6, 16 s)\", \"sf\": \"+2,66\"}, {\"f\": \"1r4k1\/1pbn1pp1\/2p1r2p\/p1Pp2q1\/N2Pp3\/1Q2P2P\/PP1N1PP1\/2R1R1K1 w - - 4 23\", \"s\": \"Te6\", \"u\": \"e8e6\", \"w\": false, \"n\": 22, \"c\": \"<b>22\u2026Te6.<\/b> La Tour se pr\u00e9pare \u00e0 basculer sur la 6<sup>e<\/sup> rang\u00e9e, vers g6 ou f6.\", \"m\": \"+0,55 (prof. 3, 17 s)\", \"sf\": \"+2,61\"}, {\"f\": \"1r4k1\/1pbn1pp1\/2p1r2p\/p1Pp2q1\/N2PpP2\/1Q2P2P\/PP1N2P1\/2R1R1K1 b - f3 0 23\", \"s\": \"f4\", \"u\": \"f2f4\", \"w\": true, \"n\": 23, \"c\": \"<b>23.f4&nbsp;?<\/b> The King veut chasser le pion e4 \u00e0 tout prix. Mais apr\u00e8s la prise en passant, la colonne f s'ouvre devant son propre Roi.\", \"m\": \"\u22121,26 (prof. 6, 26 s)\", \"sf\": \"+3,05\"}, {\"f\": \"1r4k1\/1pbn1pp1\/2p1r2p\/p1Pp2q1\/N2P4\/1Q2Pp1P\/PP1N2P1\/2R1R1K1 w - - 0 24\", \"s\": \"exf3\", \"u\": \"e4f3\", \"w\": false, \"n\": 23, \"c\": \"Prise en passant&nbsp;: le pion e4 dispara\u00eet, mais il a fait son travail.\", \"m\": \"+0,63 (prof. 3, 17 s)\", \"sf\": \"+2,73\"}, {\"f\": \"1r4k1\/1pbn1pp1\/2p1r2p\/p1Pp2q1\/N2P4\/1Q2PN1P\/PP4P1\/2R1R1K1 b - - 0 24\", \"s\": \"Cxf3\", \"u\": \"d2f3\", \"w\": true, \"n\": 24, \"c\": \"\", \"m\": \"\u22121,26 (prof. 5, 4,0 s)\", \"sf\": \"+3,27\"}, {\"f\": \"1r4k1\/1pbn1pp1\/2p1r2p\/p1Pp4\/N2P4\/1Q2PNqP\/PP4P1\/2R1R1K1 w - - 1 25\", \"s\": \"Dg3\", \"u\": \"g5g3\", \"w\": false, \"n\": 24, \"c\": \"<b>24\u2026Dg3&nbsp;!<\/b> La Dame s'installe dans le trou cr\u00e9\u00e9 par 18.h3, \u00e0 deux cases du Roi blanc. The King, lui, n'\u00e9value sa position qu'\u00e0 \u22121,5.\", \"m\": \"+0,67 (prof. 3, 17 s)\", \"sf\": \"+3,03\"}, {\"f\": \"1r4k1\/1pbn1pp1\/2p1r2p\/p1Pp4\/N2P4\/1Q2PNqP\/PPR3P1\/4R1K1 b - - 2 25\", \"s\": \"Tc2\", \"u\": \"c1c2\", \"w\": true, \"n\": 25, \"c\": \"\", \"m\": \"\u22121,49 (prof. 5, 21 s)\", \"sf\": \"+3,90\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p1rn1p\/p1Pp4\/N2P4\/1Q2PNqP\/PPR3P1\/4R1K1 w - - 3 26\", \"s\": \"Cf6\", \"u\": \"d7f6\", \"w\": false, \"n\": 25, \"c\": \"\", \"m\": \"+0,67 (prof. 3, 17 s)\", \"sf\": \"+3,79\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p1rn1p\/p1Pp4\/N2P4\/1Q2PNqP\/PP2R1P1\/4R1K1 b - - 4 26\", \"s\": \"Tce2\", \"u\": \"c2e2\", \"w\": true, \"n\": 26, \"c\": \"<b>26.Tce2.<\/b> Les Tours blanches tournent en rond. Stockfish&nbsp;: \u22125,4 pour les Blancs, The King&nbsp;: \u22121,36. L'\u00e9cart entre les deux montre tout ce que The King ne voit pas.\", \"m\": \"\u22121,36 (prof. 5, 13 s)\", \"sf\": \"+5,37\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p1r2p\/p1Pp4\/N2Pn3\/1Q2PNqP\/PP2R1P1\/4R1K1 w - - 5 27\", \"s\": \"Ce4\", \"u\": \"f6e4\", \"w\": false, \"n\": 26, \"c\": \"Le Cavalier entre en e4, d'o\u00f9 il menace de sauter en g5.\", \"m\": \"+0,75 (prof. 3, 17 s)\", \"sf\": \"+5,39\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p1r2p\/p1Pp4\/3Pn3\/1QN1PNqP\/PP2R1P1\/4R1K1 b - - 6 27\", \"s\": \"Cc3\", \"u\": \"a4c3\", \"w\": true, \"n\": 27, \"c\": \"\", \"m\": \"\u22121,82 (prof. 5, 11 s)\", \"sf\": \"+6,63\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p1r2p\/p1Pp2n1\/3P4\/1QN1PNqP\/PP2R1P1\/4R1K1 w - - 7 28\", \"s\": \"Cg5\", \"u\": \"e4g5\", \"w\": false, \"n\": 27, \"c\": \"<b>27\u2026Cg5&nbsp;!<\/b> Le Cavalier vise f3 et h3. Toute la d\u00e9fense blanche repose d\u00e9sormais sur le Cavalier f3. Le RISC&nbsp;II passe \u00e0 +2,45.\", \"m\": \"+2,45 (prof. 3, 17 s)\", \"sf\": \"+6,57\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p1r2p\/p1Pp2n1\/3P4\/1QN1PNqP\/PP2R1P1\/5RK1 b - - 8 28\", \"s\": \"Tf1\", \"u\": \"e1f1\", \"w\": true, \"n\": 28, \"c\": \"\", \"m\": \"\u22121,65 (prof. 4, 4,4 s)\", \"sf\": \"+6,79\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p2r1p\/p1Pp2n1\/3P4\/1QN1PNqP\/PP2R1P1\/5RK1 w - - 9 29\", \"s\": \"Tf6\", \"u\": \"e6f6\", \"w\": false, \"n\": 28, \"c\": \"<b>28\u2026Tf6&nbsp;!<\/b> La Tour arrive par la 6<sup>e<\/sup> rang\u00e9e, en batterie contre f3&nbsp;: le Cavalier f3 est attaqu\u00e9 deux fois. Le RISC&nbsp;II annonce +4,34.\", \"m\": \"+4,34 (prof. 3, 17 s)\", \"sf\": \"+6,66\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p2r1p\/p1PN2n1\/3P4\/1Q2PNqP\/PP2R1P1\/5RK1 b - - 0 29\", \"s\": \"Cxd5\", \"u\": \"c3d5\", \"w\": true, \"n\": 29, \"c\": \"<b>29.Cxd5.<\/b> The King prend un pion en mena\u00e7ant la Tour f6 et le Fou c7&nbsp;: c'est le meilleur coup selon Stockfish, mais la position est d\u00e9j\u00e0 perdue.\", \"m\": \"\u22123,11 (prof. 5, 33 s)\", \"sf\": \"+7,20\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p4p\/p1PN2n1\/3P4\/1Q2PrqP\/PP2R1P1\/5RK1 w - - 0 30\", \"s\": \"Txf3\", \"u\": \"f6f3\", \"w\": false, \"n\": 29, \"c\": \"<b>29\u2026Txf3&nbsp;!!<\/b> Le RISC&nbsp;II rend la qualit\u00e9 (la Tour contre le Cavalier) pour \u00e9liminer le dernier d\u00e9fenseur du Roi blanc. Il annonce +5,12&nbsp;; Stockfish confirme \u22129 pour les Blancs.\", \"m\": \"+5,12 (prof. 3, 17 s)\", \"sf\": \"+8,97\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p4p\/p1PN2n1\/3P4\/1Q2PRqP\/PP2R1P1\/6K1 b - - 0 30\", \"s\": \"Txf3\", \"u\": \"f1f3\", \"w\": true, \"n\": 30, \"c\": \"Reprise forc\u00e9e. The King, \u00e0 43&nbsp;secondes de r\u00e9flexion, ne voit que \u22125,78.\", \"m\": \"\u22125,78 (prof. 5, 43 s)\", \"sf\": \"+10,62\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p4p\/p1PN2n1\/3P4\/1Q2PR1P\/PP2R1Pq\/6K1 w - - 1 31\", \"s\": \"Dh2+\", \"u\": \"g3h2\", \"w\": false, \"n\": 30, \"c\": \"<b>30\u2026Dh2+&nbsp;!<\/b> La Dame entre dans le roque. Commence une chasse au Roi qui va traverser tout l'\u00e9chiquier, de g1 \u00e0 c1.\", \"m\": \"+9,92 (prof. 3, 17 s)\", \"sf\": \"+10,43\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p4p\/p1PN2n1\/3P4\/1Q2PR1P\/PP2RKPq\/8 b - - 2 31\", \"s\": \"Rf2\", \"u\": \"g1f2\", \"w\": true, \"n\": 31, \"c\": \"\", \"m\": \"\u22121,95 (prof. 2, 0,2 s)\", \"sf\": \"+11,44\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p4p\/p1PN4\/3Pn3\/1Q2PR1P\/PP2RKPq\/8 w - - 3 32\", \"s\": \"Ce4+\", \"u\": \"g5e4\", \"w\": false, \"n\": 31, \"c\": \"<b>31\u2026Ce4+.<\/b> Le Cavalier revient au centre avec \u00e9chec.\", \"m\": \"+10,04 (prof. 3, 17 s)\", \"sf\": \"+10,98\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p4p\/p1PN4\/3Pn3\/1Q2PR1P\/PP2R1Pq\/4K3 b - - 4 32\", \"s\": \"Re1\", \"u\": \"f2e1\", \"w\": true, \"n\": 32, \"c\": \"\", \"m\": \"+0,44 (prof. 2, 0,2 s)\", \"sf\": \"+11,62\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p4p\/p1PN4\/3Pn3\/1Q2PR1P\/PP2R1P1\/4K1q1 w - - 5 33\", \"s\": \"Dg1+\", \"u\": \"h2g1\", \"w\": false, \"n\": 32, \"c\": \"<b>32\u2026Dg1+.<\/b> Le Roi blanc est sorti de son roque&nbsp;; la Dame noire est derri\u00e8re lui.\", \"m\": \"+11,69 (prof. 3, 17 s)\", \"sf\": \"+11,30\"}, {\"f\": \"1r4k1\/1pb2pp1\/2p4p\/p1PN4\/3Pn3\/1Q2P2P\/PP2R1P1\/4KRq1 b - - 6 33\", \"s\": \"Tf1\", \"u\": \"f3f1\", \"w\": true, \"n\": 33, \"c\": \"\", \"m\": \"\u22121,39 (prof. 2, 0,2 s)\", \"sf\": \"+11,77\"}, {\"f\": \"1r4k1\/1p3pp1\/2p4p\/p1PN4\/3Pn3\/1Q2P1bP\/PP2R1P1\/4KRq1 w - - 7 34\", \"s\": \"Fg3+\", \"u\": \"c7g3\", \"w\": false, \"n\": 33, \"c\": \"<b>33\u2026Fg3+&nbsp;!<\/b> Le Fou c7, immobile depuis le 10<sup>e<\/sup> coup, traverse enfin la diagonale b8-h2.\", \"m\": \"+11,99 (prof. 4, 17 s)\", \"sf\": \"+11,53\"}, {\"f\": \"1r4k1\/1p3pp1\/2p4p\/p1PN4\/3Pn3\/1Q2P1bP\/PP3RP1\/4KRq1 b - - 8 34\", \"s\": \"Tf2\", \"u\": \"e2f2\", \"w\": true, \"n\": 34, \"c\": \"\", \"m\": \"\u22125,20 (prof. 7, 13 s)\", \"sf\": \"+12,04\"}, {\"f\": \"1r4k1\/1p3pp1\/2p4p\/p1PN4\/3Pn3\/1Q2P2P\/PP3bP1\/4KRq1 w - - 0 35\", \"s\": \"Fxf2+\", \"u\": \"g3f2\", \"w\": false, \"n\": 34, \"c\": \"<b>34\u2026Fxf2+.<\/b> Le Fou reprend la Tour&nbsp;: les Noirs passent devant au mat\u00e9riel, et le Roi blanc est toujours \u00e0 d\u00e9couvert.\", \"m\": \"+11,78 (prof. 3, 17 s)\", \"sf\": \"+11,95\"}, {\"f\": \"1r4k1\/1p3pp1\/2p4p\/p1PN4\/3Pn3\/1Q2P2P\/PP2KbP1\/5Rq1 b - - 1 35\", \"s\": \"Re2\", \"u\": \"e1e2\", \"w\": true, \"n\": 35, \"c\": \"\", \"m\": \"\u22125,19 (prof. 6, 6,3 s)\", \"sf\": \"+12,29\"}, {\"f\": \"1r4k1\/1p3pp1\/2p4p\/p1PN4\/3P4\/1Q2P1nP\/PP2KbP1\/5Rq1 w - - 2 36\", \"s\": \"Cg3+\", \"u\": \"e4g3\", \"w\": false, \"n\": 35, \"c\": \"<b>35\u2026Cg3+.<\/b> Le Roi blanc doit choisir entre f3 et l'aile dame.\", \"m\": \"+12,45 (prof. 3, 17 s)\", \"sf\": \"+12,01\"}, {\"f\": \"1r4k1\/1p3pp1\/2p4p\/p1PN4\/3P4\/1Q2PKnP\/PP3bP1\/5Rq1 b - - 3 36\", \"s\": \"Rf3\", \"u\": \"e2f3\", \"w\": true, \"n\": 36, \"c\": \"<b>36.Rf3&nbsp;?<\/b> Le Roi s'avance vers ses assaillants&nbsp;: apr\u00e8s 36\u2026Dxf1, Stockfish annonce un mat forc\u00e9. <b>36.Rd2<\/b> durait plus longtemps.\", \"m\": \"\u22125,19 (prof. 5, 5,1 s)\", \"sf\": \"+15,14\"}, {\"f\": \"1r4k1\/1p3pp1\/2p4p\/p1PN4\/3P4\/1Q2PKnP\/PP3bP1\/5q2 w - - 0 37\", \"s\": \"Dxf1\", \"u\": \"g1f1\", \"w\": false, \"n\": 36, \"c\": \"<b>36\u2026Dxf1.<\/b> La Dame ramasse la derni\u00e8re Tour blanche&nbsp;: les Noirs ont sept points de mat\u00e9riel d'avance, et le mat approche.\", \"m\": \"+14,13 (prof. 3, 17 s)\", \"sf\": \"mat en 15 pour le RISC II\"}, {\"f\": \"1r4k1\/1p3pp1\/2p4p\/p1P5\/3P1N2\/1Q2PKnP\/PP3bP1\/5q2 b - - 1 37\", \"s\": \"Cf4\", \"u\": \"d5f4\", \"w\": true, \"n\": 37, \"c\": \"\", \"m\": \"\u22129,21 (prof. 5, 32 s)\", \"sf\": \"mat en 7 pour le RISC II\"}, {\"f\": \"1r4k1\/1p3pp1\/2p4p\/p1P5\/3P1N2\/1Q2bKnP\/PP4P1\/5q2 w - - 0 38\", \"s\": \"Fxe3+\", \"u\": \"f2e3\", \"w\": false, \"n\": 37, \"c\": \"<b>37\u2026Fxe3+&nbsp;!<\/b> Le Fou se sacrifie pour ouvrir la colonne e. Stockfish pr\u00e9f\u00e9rait 37\u2026Te8, qui mate un peu plus vite&nbsp;; les deux gagnent.\", \"m\": \"+42,00 (prof. 2, 16 s)\", \"sf\": \"mat en 7 pour le RISC II\"}, {\"f\": \"1r4k1\/1p3pp1\/2p4p\/p1P5\/3P1N2\/1Q2K1nP\/PP4P1\/5q2 b - - 0 38\", \"s\": \"Rxe3\", \"u\": \"f3e3\", \"w\": true, \"n\": 38, \"c\": \"\", \"m\": \"\u22125,30 (prof. 2, 0,2 s)\", \"sf\": \"mat en 6 pour le RISC II\"}, {\"f\": \"4r1k1\/1p3pp1\/2p4p\/p1P5\/3P1N2\/1Q2K1nP\/PP4P1\/5q2 w - - 1 39\", \"s\": \"Te8+\", \"u\": \"b8e8\", \"w\": false, \"n\": 38, \"c\": \"<b>38\u2026Te8+.<\/b> La Tour b8 arrive sur la colonne ouverte.\", \"m\": \"+50,00 (prof. 2, 15 s)\", \"sf\": \"mat en 5 pour le RISC II\"}, {\"f\": \"4r1k1\/1p3pp1\/2p1Q2p\/p1P5\/3P1N2\/4K1nP\/PP4P1\/5q2 b - - 2 39\", \"s\": \"De6\", \"u\": \"b3e6\", \"w\": true, \"n\": 39, \"c\": \"<b>39.De6.<\/b> The King donne sa Dame pour retarder le mat.\", \"m\": \"+8,00 (prof. 5, 7,7 s)\", \"sf\": \"mat en 5 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p1r2p\/p1P5\/3P1N2\/4K1nP\/PP4P1\/5q2 w - - 0 40\", \"s\": \"Txe6+\", \"u\": \"e8e6\", \"w\": false, \"n\": 39, \"c\": \"Le RISC&nbsp;II reprend la Dame avec \u00e9chec.\", \"m\": \"+46,00 (prof. 1, 1,2 s)\", \"sf\": \"mat en 4 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p1r2p\/p1P5\/3P1N2\/6nP\/PP1K2P1\/5q2 b - - 1 40\", \"s\": \"Rd2\", \"u\": \"e3d2\", \"w\": true, \"n\": 40, \"c\": \"\", \"m\": \"\u22129,93 (prof. 2, 0,2 s)\", \"sf\": \"mat en 4 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p1r2p\/p1P5\/3PnN2\/7P\/PP1K2P1\/5q2 w - - 2 41\", \"s\": \"Ce4+\", \"u\": \"g3e4\", \"w\": false, \"n\": 40, \"c\": \"Le Cavalier revient en e4 avec \u00e9chec. Le Roi blanc est pouss\u00e9 vers l'aile dame.\", \"m\": \"+48,00 (prof. 1, 1,7 s)\", \"sf\": \"mat en 5 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p1r2p\/p1P5\/3PnN2\/7P\/PPK3P1\/5q2 b - - 3 41\", \"s\": \"Rc2\", \"u\": \"d2c2\", \"w\": true, \"n\": 41, \"c\": \"\", \"m\": \"\u22129,93 (prof. 2, 0,2 s)\", \"sf\": \"mat en 5 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p1r2p\/p1P5\/2qPnN2\/7P\/PPK3P1\/8 w - - 4 42\", \"s\": \"Dc4+\", \"u\": \"f1c4\", \"w\": false, \"n\": 41, \"c\": \"\", \"m\": \"+50,00 (prof. 1, 1,4 s)\", \"sf\": \"mat en 4 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p1r2p\/p1P5\/2qPnN2\/7P\/PP4P1\/3K4 b - - 5 42\", \"s\": \"Rd1\", \"u\": \"c2d1\", \"w\": true, \"n\": 42, \"c\": \"\", \"m\": \"\u22129,87 (prof. 2, 0,2 s)\", \"sf\": \"mat en 4 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p1r2p\/p1P5\/2qP1N2\/7P\/PP3nP1\/3K4 w - - 6 43\", \"s\": \"Cf2+\", \"u\": \"e4f2\", \"w\": false, \"n\": 42, \"c\": \"\", \"m\": \"+54,00 (prof. 1, 1,8 s)\", \"sf\": \"mat en 4 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p1r2p\/p1P5\/2qP1N2\/7P\/PP1K1nP1\/8 b - - 7 43\", \"s\": \"Rd2\", \"u\": \"d1d2\", \"w\": true, \"n\": 43, \"c\": \"\", \"m\": \"\u221211,66 (prof. 2, 0,2 s)\", \"sf\": \"mat en 4 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p1r2p\/p1P5\/3q1N2\/7P\/PP1K1nP1\/8 w - - 0 44\", \"s\": \"Dxd4+\", \"u\": \"c4d4\", \"w\": false, \"n\": 43, \"c\": \"<b>43\u2026Dxd4+.<\/b> Le pion d4 tombe avec \u00e9chec.\", \"m\": \"+56,00 (prof. 1, 1,4 s)\", \"sf\": \"mat en 3 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p1r2p\/p1P5\/3q1N2\/7P\/PPK2nP1\/8 b - - 1 44\", \"s\": \"Rc2\", \"u\": \"d2c2\", \"w\": true, \"n\": 44, \"c\": \"\", \"m\": \"+2,00 (prof. 2, 0,2 s)\", \"sf\": \"mat en 3 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p4p\/p1P5\/3q1N2\/7P\/PPK1rnP1\/8 w - - 2 45\", \"s\": \"Te2+\", \"u\": \"e6e2\", \"w\": false, \"n\": 44, \"c\": \"<b>44\u2026Te2+&nbsp;!<\/b> Encore un sacrifice&nbsp;: la Tour se donne pour d\u00e9vier le Cavalier f4, qui gardait la case d3.\", \"m\": \"+58,00 (prof. 1, 1,6 s)\", \"sf\": \"mat en 2 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p4p\/p1P5\/3q4\/7P\/PPK1NnP1\/8 b - - 0 45\", \"s\": \"Cxe2\", \"u\": \"f4e2\", \"w\": true, \"n\": 45, \"c\": \"\", \"m\": \"+2,00 (prof. 2, 0,2 s)\", \"sf\": \"mat en 2 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p4p\/p1P5\/8\/3q3P\/PPK1NnP1\/8 w - - 1 46\", \"s\": \"Dd3+\", \"u\": \"d4d3\", \"w\": false, \"n\": 45, \"c\": \"\", \"m\": \"livre ou coup imm\u00e9diat (0,7 s)\", \"sf\": \"mat en 1 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p4p\/p1P5\/8\/3q3P\/PP2NnP1\/2K5 b - - 2 46\", \"s\": \"Rc1\", \"u\": \"c2c1\", \"w\": true, \"n\": 46, \"c\": \"\", \"m\": \"0,00 (prof. 2, 0,1 s)\", \"sf\": \"mat en 1 pour le RISC II\"}, {\"f\": \"6k1\/1p3pp1\/2p4p\/p1P5\/8\/7P\/PP2NnP1\/2Kq4 w - - 3 47\", \"s\": \"Dd1#\", \"u\": \"d3d1\", \"w\": false, \"n\": 46, \"c\": \"<b>46\u2026Dd1#.<\/b> Mat. Le Roi blanc, chass\u00e9 de g1 \u00e0 c1 \u00e0 travers tout l'\u00e9chiquier, tombe sous la Dame noire, prot\u00e9g\u00e9e par le Cavalier f2. Partie jou\u00e9e en 16&nbsp;minutes.\", \"m\": \"livre ou coup imm\u00e9diat (1,6 s)\", \"sf\": \"mat\"}], START = \"rnbqkbnr\/pppppppp\/8\/8\/8\/8\/PPPPPPPP\/RNBQKBNR w KQkq - 0 1\";\nvar PIECE = {P:\"white-pawn\",N:\"white-knight\",B:\"white-bishop\",R:\"white-rook\",Q:\"white-queen\",K:\"white-king\",\np:\"black-pawn\",n:\"black-knight\",b:\"black-bishop\",r:\"black-rook\",q:\"black-queen\",k:\"black-king\"};\nvar boardEl = document.getElementById(\"r2-board\"), com = document.getElementById(\"r2-com\"),\npos = document.getElementById(\"r2-pos\"), liste = document.getElementById(\"r2-liste\"),\nzone = document.getElementById(\"r2-rejeu\");\nif(!boardEl) return;\nvar cur = -1, btns = [];\nfunction svg(fen, last){\nvar s = '<svg class=\"bd\" viewBox=\"-14 -2 378 378\" role=\"img\" aria-label=\"\u00c9chiquier\">';\nvar r, c;\nfor(r = 0; r < 8; r++) for(c = 0; c < 8; c++){\ns += '<rect x=\"' + c*45 + '\" y=\"' + r*45 + '\" width=\"45\" height=\"45\" fill=\"' + ((r + c) % 2 ? \"#b58a5a\" : \"#efe6d2\") + '\"\/>';\n}\nif(last){\n[last.slice(0,2), last.slice(2,4)].forEach(function(q){\nvar cc = q.charCodeAt(0) - 97, rr = 8 - parseInt(q[1], 10);\ns += '<rect x=\"' + cc*45 + '\" y=\"' + rr*45 + '\" width=\"45\" height=\"45\" fill=\"#c0392b\" opacity=\".28\"\/>';\n});\n}\nvar rows = fen.split(\" \")[0].split(\"\/\");\nfor(r = 0; r < 8; r++){\nc = 0;\nfor(var k = 0; k < rows[r].length; k++){\nvar ch = rows[r][k];\nif(\/[1-8]\/.test(ch)){ c += parseInt(ch, 10); }\nelse { s += '<use href=\"#' + PIECE[ch] + '\" x=\"' + c*45 + '\" y=\"' + r*45 + '\"\/>'; c++; }\n}\n}\nfor(var i = 0; i < 8; i++){\ns += '<text x=\"' + (i*45 + 22) + '\" y=\"372\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"10\" fill=\"#6b665c\">' + \"abcdefgh\"[i] + '<\/text>';\ns += '<text x=\"-7\" y=\"' + (i*45 + 26) + '\" text-anchor=\"middle\" font-family=\"JetBrains Mono,monospace\" font-size=\"10\" fill=\"#6b665c\">' + (8 - i) + '<\/text>';\n}\nreturn s + '<\/svg>';\n}\nfunction label(i){ var m = R[i]; return m.w ? (m.n + \".\" + m.s) : (m.n + \"\u2026\" + m.s); }\n\/\/ liste des coups\nvar h = \"\";\nfor(var i = 0; i < R.length; i += 2){\nh += '<div class=\"no\">' + R[i].n + '.<\/div>';\nh += '<button type=\"button\" data-i=\"' + i + '\"' + (R[i].c ? ' class=\"cm\"' : '') + '>' + R[i].s + '<\/button>';\nh += (i + 1 < R.length) ? '<button type=\"button\" data-i=\"' + (i+1) + '\"' + (R[i+1].c ? ' class=\"cm\"' : '') + '>' + R[i+1].s + '<\/button>' : '<div><\/div>';\n}\nliste.innerHTML = h;\n[].slice.call(liste.querySelectorAll(\"button\")).forEach(function(b){\nvar k = parseInt(b.getAttribute(\"data-i\"), 10); btns[k] = b;\nb.addEventListener(\"click\", function(){ aller(k); });\n});\nfunction aller(i){\ncur = Math.max(-1, Math.min(R.length - 1, i));\nvar fen = cur < 0 ? START : R[cur].f;\nboardEl.innerHTML = svg(fen, cur < 0 ? null : R[cur].u);\npos.textContent = cur < 0 ? \"position de d\u00e9part\" : label(cur);\nbtns.forEach(function(b, k){ if(b) b.className = (R[k].c ? \"cm\" : \"\") + (k === cur ? \" on\" : \"\"); });\nif(cur >= 0 && btns[cur]){\nvar b = btns[cur], top = b.offsetTop - liste.offsetTop;\nif(top < liste.scrollTop || top > liste.scrollTop + liste.clientHeight - 24) liste.scrollTop = top - 60;\n}\nif(cur < 0){\ncom.innerHTML = '<p>The King 2.54 ChessMachine 14&nbsp;MHz (Blancs) contre Mephisto RISC II 56&nbsp;MHz (Noirs). Avancez avec \u25b6 ou cliquez un coup&nbsp;; les coups en gras sont comment\u00e9s.<\/p>';\nreturn;\n}\nvar m = R[cur], qui = m.w ? \"The King\" : \"RISC II\";\nvar t = (m.c && m.c.indexOf('<b>') === 0) ? m.c : '<strong>' + label(cur) + '<\/strong> ' + (m.c || \"\");\nvar ev = [];\nif(m.m) ev.push(qui + \"&nbsp;: \" + m.m);\nif(m.sf) ev.push(\"Stockfish (point de vue du RISC II)&nbsp;: \" + m.sf);\ncom.innerHTML = '<p style=\"margin:0\">' + t + '<\/p>' + (ev.length ? 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d.getAttribute(\"data-u\"));\n});\naller(-1);\n})();\n\n<\/script>\n<\/article>\n\n","protected":false},"excerpt":{"rendered":"<p>Laboratoire \u00b7 acc\u00e9l\u00e9ration Mephisto RISC II \u00e0 56 MHz Gauntlet acc\u00e9l\u00e9r\u00e9 CB-Emu&nbsp;: le Gideon 3.1 d&#8217;Ed Schr\u00f6der, quatre fois plus vite MEPHISTO RISC II Txf3 Dh2+ Ce4+ Gideon 3.1 +5.12 ARM2 14 \u2192 56 ENT GIDEON 3.1 \u00b7 ED SCHR\u00d6DER \u00b7 \u00d74 2374 Elo \u00b114 \u00d74 14 \u2192 56 MHz 181 parties +150 gain vs&hellip;&nbsp;<a href=\"https:\/\/www.chess.lumn.eu\/wordpress\/2026\/11\/02\/mephisto-risc-ii-56mhz\/\" class=\"\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">Mephisto RISC II 56MHz<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":4640,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"categories":[70,72],"tags":[],"rttpg_featured_image_url":{"full":["https:\/\/www.chess.lumn.eu\/wordpress\/wp-content\/uploads\/2026\/11\/mephisto-risc-ii-56mhz-une.jpg",1080,1080,false],"landscape":["https:\/\/www.chess.lumn.eu\/wordpress\/wp-content\/uploads\/2026\/11\/mephisto-risc-ii-56mhz-une.jpg",1080,1080,false],"portraits":["https:\/\/www.chess.lumn.eu\/wordpress\/wp-content\/uploads\/2026\/11\/mephisto-risc-ii-56mhz-une.jpg",1080,1080,false],"thumbnail":["https:\/\/www.chess.lumn.eu\/wordpress\/wp-content\/uploads\/2026\/11\/mephisto-risc-ii-56mhz-une-150x150.jpg",150,150,true],"medium":["https:\/\/www.chess.lumn.eu\/wordpress\/wp-content\/uploads\/2026\/11\/mephisto-risc-ii-56mhz-une-300x300.jpg",300,300,true],"large":["https:\/\/www.chess.lumn.eu\/wordpress\/wp-content\/uploads\/2026\/11\/mephisto-risc-ii-56mhz-une-1024x1024.jpg",1024,1024,true],"1536x1536":["https:\/\/www.chess.lumn.eu\/wordpress\/wp-content\/uploads\/2026\/11\/mephisto-risc-ii-56mhz-une.jpg",1080,1080,false],"2048x2048":["https:\/\/www.chess.lumn.eu\/wordpress\/wp-content\/uploads\/2026\/11\/mephisto-risc-ii-56mhz-une.jpg",1080,1080,false],"neve-blog":["https:\/\/www.chess.lumn.eu\/wordpress\/wp-content\/uploads\/2026\/11\/mephisto-risc-ii-56mhz-une-930x620.jpg",930,620,true]},"rttpg_author":{"display_name":"valterd","author_link":"https:\/\/www.chess.lumn.eu\/wordpress\/author\/valterd\/"},"rttpg_comment":0,"rttpg_category":"<a 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vs&hellip;&nbsp;Read&hellip;","_links":{"self":[{"href":"https:\/\/www.chess.lumn.eu\/wordpress\/wp-json\/wp\/v2\/posts\/4641"}],"collection":[{"href":"https:\/\/www.chess.lumn.eu\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chess.lumn.eu\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chess.lumn.eu\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chess.lumn.eu\/wordpress\/wp-json\/wp\/v2\/comments?post=4641"}],"version-history":[{"count":1,"href":"https:\/\/www.chess.lumn.eu\/wordpress\/wp-json\/wp\/v2\/posts\/4641\/revisions"}],"predecessor-version":[{"id":4642,"href":"https:\/\/www.chess.lumn.eu\/wordpress\/wp-json\/wp\/v2\/posts\/4641\/revisions\/4642"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.chess.lumn.eu\/wordpress\/wp-json\/wp\/v2\/media\/4640"}],"wp:attachment":[{"href":"https:\/\/www.chess.lumn.eu\/wordpress\/wp-json\/wp\/v2\/media?parent=4641"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chess.lumn.eu\/wordpress\/wp-json\/wp\/v2\/categories?post=4641"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chess.lumn.eu\/wordpress\/wp-json\/wp\/v2\/tags?post=4641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}