Intrinsic Performance Ratings of top programs minus Rybka,Houdini,Stockfish (and Critter,Komodo,Naum...) in the 2011 and 2013 World Computer Chess Championships (WCCC), and the 2013 World Chess Software Championship (WCSC). Plus IPrs from some famous earlier Human-Computer matches. As with all IPRs through Sept. 2013, analysis is (only) with Rybka 3 in 50-PV mode to depth 13. Columns on the right give results omitting games with tailenders Woodpusher in 2011 and Merlin in 2013, each of which scored 0. Error bars are +-100 to 150. ---------------------------------------------------------------------------- WCCC2011 Comp. IPR OppIPR Diff Score, w/o W IPRnoW OppnoW DiffnoW Junior 3065 2995 +70 +4 +3 3061 3041 +20 Shredder 3086 3057 +29 +3 +2 3079 3108 -29 Hiarcs 2941 2789 +152 +3 +2 2912 2765 +147 Pandix 3075 2895 +180 +2 +1 3088 2873 +215 Jonny 3075 3069 +6 +2 +1 3072 3086 -16 The Baron 2727 2948 -221 +1 0 2709 2961 -252 Booot 2944 2873 +71 -2 -3 2944 2916 +28 Rookie 2985 3073 -88 -5 -6 3019 3115 +96 Woodpusher 2741 2996 -255 -8 WCCC2013 Comp. IPR OppIPR Diff Score, w/o M IPRnoM OppnoM DiffnoM Junior 2997 2924 +73 +5 +3 2975 2969 +6 Jonny 3199 3083 +116 +4 +2 3181 3186 -5 Hiarcs 3083 3073 +10 +1 -1 3082 3129 -47 Pandix 3089 2955 +134 +1 -1 3058 2964 +92 Shredder 3014 3009 +5 -1 -3 2995 3055 -60 Merlin 2661 3204 -543 -10 WCSC2013 Comp. IPR OppIPR Diff Score, w/o M IPRnoM OppnoM DiffnoM Hiarcs 3073 2995 +78 +4 +2 3064 3035 +29 Pandix 3149 2892 +257 +3 +1 3133 2918 +215 Junior 2962 3055 -93 +3 +1 2949 3110 -161 Jonny 2965 2955 +10 +1 -1 2935 2983 -48 Shredder 3041 2991 +50 -1 -3 3002 3024 -22 Merlin 2688 3219 -531 -10 WCCC2015---Rybka 3: 2995 +- 40; Houdini 4: 2965; Komodo 9: 2915; Stockfish 6: 3035 Comp. IPR OppIPR Diff Score Houdini 4 Komodo 9 Stockfish 6 Fridolin 2785 +- 165 3230 -445 -8 2650 v 3185 2730 v 3145 2845 v 3225 Ginkgo 3065 +- 80 3075 - 10 0 3080 v 2950 3065 v 2630! 3205 v 3060 Hiarcs 3080 +- 100 2865 +215 +2 2985 v 2925 2730 v 2905 3020 v 2960 Jonny 2970 +- 115 2970 0 +6 2985 v 2805 2865 v 2925 3005 v 2975 Komodo 2910 +- 110 2895 + 15 +5 2920 v 2865 2905 v 2805 2980 v 2955 Maverick 2930 +- 180 3105 -175 -6 2840 v 3035 2830 v 3035 2875 v 3140 Protector 3165 +- 85 2975 +190 +2 3165 v 3015 3105 v 2935 3215 v 3060 Shredder 2955 +- 115 2980 - 25 +1 2940 v 3000 2955 v 2940 3020 v 2965 The Baron 3005 +- 125 3030 - 25 -2 3035 v 3085 2975 v 2975 3070 v 3145 WCSC2015---Rybka 3: 3005 +- 45; Houdini 4: 3029; Komodo 9: 2965; Stockfish 6: 3015 Comp. IPR OppIPR Diff Score Houdini 4 Komodo 9 Stockfish 6 Fridolin 2915 +- 175 3160 -245 -7 2915 v 3110 2825 v 3075 2910 v 3080 Ginkgo 2990 +- 110 2950 + 40 +3 2975 v 3015 2995 v 2940 3090 v 3020 Hiarcs 2910 +- 170 3040 -130 +1 3020 v 3015 3005 v 2870 3055 v 2995 Jonny 3085 +- 105 3035 + 50 0 3050 v 3055 2960 v 2925 3010 v 2985 Komodo 2990 +- 155 3025 - 35 +2 3150 v 3145 2920 v 3080 2980 v 3110 Maverick 2920 +- 175 2890 + 30 -4 3015 v 3045 2975 v 2885 2955 v 2900 Protector 3125 +- 145 3030 + 95 +2 3140 v 2970 3055 v 2910 3035 v 2985 Shredder 3075 +- 85 2990 + 85 +3 3060 v 2970 2990 v 3000 3045 v 3020 ---------------------------------------------------------------------------- It is possible that these numbers are mainly a "Rybka similarity metric". It is noteworthy that most of the numbers are below ones obtained for games by Houdini versions and by certain players accused of cheating since December 2012. To compare, here are IPR's in some famous Human-Computer events, with error bars. 1978: Chess 4.7 2120 +- 490 (159 turns), vs. David Levy 2280 +- 415 (159 turns) 1983: Belle 2180 +- 300 (279 turns), vs. US Open oppts. 2175 +- 320 (280 turns) 1983: Belle 2070 +- 415 (126 turns) vs. WCCC 1983 oppts. 2130 +- 420 (131 turns) 1983: Cray Blitz 2265 +- 350 (144 turns) vs. WCCC 1983 oppts. 2065 +- 405 (152 turns) 1986: Cray Blitz 2605 +- 315 (153 turns) vs. WCCC 1986 oppts. 2135 +- 395 (155 turns) 1986: Hitech 1975 +- 625 (111 turns) vs. WCCC 1986 oppts. 1805 +- 660 (115 turns) 1988: Hitech 2495 +- 270 (188 turns) vs. avail. Open oppts. 2165 +- 385 (194 turns) 1989: Hitech 3085 +- 275 (97 turns) vs. Denker 2100 +- 555 (98 turns) 1989: Hitech 2445 +- 325 (146 turns) vs. WCCC 1989 oppts. 2485 +- 245 (149 turns) 1989: Bebe 2415 +- 420 (141 turns) vs. WCCC1989 oppts. 1910 +- 505 (144 turns) 1989: Cray Blitz 2470 +- 375 (195 turns) vs. WCCC 1989 oppts. 2255 +- 360 (196 turns) 1989: Chiptest 2540 +- 285 (185 turns) vs. The Hague oppts. 2545 +- 250 9181 turns) 1989: Deep Thought 2600 +- 255 (126 turns) vs. WCCC 1989 oppts. 1890 +- 445 (132 turns) 1988: Deep Thought 2780 +- 230 (269 turns) vs. Long Beach oppts. 2400 +- 265 (270 turns) 1989: Deep Thought 2885 +- 325 (74 turns) vs. David Levy 1820 +- 560 (79 turns) 1989: Deep Thought 2325 +- 400 (85 turns) vs. Byrne 2215 +- 690 (83 turns) 1989: Deep Thought 2955 +- 245 (131 turns) vs. Miles/Renet/Valvo 2585 +- 275 (131 turns) 1989: Deep Thought 2830 +- 290 (130 turns) vs. American Open oppts. 1990 +- 440 (133 turns) 1989: Deep Thought 2265 +- 815 (53 turns) vs. Kasparov 2445 +- 340 (51 turns) Deep Thought 1989 human aggregate: 2715 +- 165 (473 turns) 1991: Deep Thought 2205 +- 430 (213 turns), seven Hannover opponents 2400 +- 265 (214 turns) 1993: Deep Blue 2820 +- 215 (173 turns) vs. Larsen 2800 +- 210 (172 turns) 1993: Deep Blue 2720 +- 210 (249 turns) vs. seven Copenhagen oppts. (besides Larsen) 2340 +- 295 (246 turns) 1995: Deep Blue 3080 +- 220 (100 turns) vs. ACM oppts. 2550 +- 420 (103 turns) 1995: Deep Blue 2695 +- 430 (119 turns) vs. WCCC 1995 oppts. 2420 +- 475 (120 turns) 1996: Deep Blue 2915 +- 200 (222 turns) vs. Kasparov 2610 +- 235 (220 turns) 1997: Deep Blue 2850 +- 190 (205 turns) vs. Kasparov 2585 +- 260 (205 turns) 1999: Rebel 10 2915 +- 590 (58 turns) vs. Anand 2660 +- 605 (58 turns) 2000: Deep Junior 2845 +- 165 (300 turns) vs. Dortmund oppts. 2605 +- 220 (298 turns) 2002: Deep Fritz 3055 +- 140 (221 turns) vs. Kramnik 2885 +- 155 (221 turns) 2003: Fritz X3D 2955 +- 175 (107 turns) vs. Kasparov 2475 +- 395 (108 turns) 2003: Deep Junior 2855 +- 275 (148 turns) vs. Kasparov 2750 +- 305 (148 turns) 2004: Fritz 2945 +- 255 (134 turns) vs. Bilbao HC oppts. 2530 +- 305 (136 turns) 2004: Hydra 3045 +- 230 (176 turns) vs. Bilbao HC oppts. 2510 +- 275 (176 turns) 2004: Junior 2835 +- 290 (124 turns) vs. Bilbao HC oppts. 2910 +- 155 (121 turns) 2004: Fritz+Hydra+Junior 2955 +- 150 (434 turns) vs. Bilbao HC oppts. 2630 +- 150 (433 turns) 2005: Fritz 2705 +- 350 (170 turns) vs. Bilbao HC oppts. 2740 +- 280 (170 turns) 2005: Hydra 3080 +- 190 (99 turns) vs. Bilbao HC oppts. 2600 +- 340 (101 turns) 2005: Junior 3085 +- 100 (251 turns) vs. Bilbao HC oppts. 2935 +- 115 (251 turns) 2005: Fritz+Hydra+Junior 2905 +- 120 (520 turns) vs. Bilbao HC oppts. 2775 +- 120 (522 turns) 2005: Shredder 2990 +- 165 (239 turns) vs. Vicente Lopez ITT oppts. 2265 +- 275 (243 turns) 2005: Hydra 3160 +- 115 (210 turns) vs. Adams 2825 +- 175 (208 turns) 2006: Deep Fritz 2985 +- 160 (208 turns) vs. Kramnik 2740 +- 265 (208 turns) 2009: Hiarcs (as Pocket Fritz) 2905 +- 165 (290 turns), Mercosur Cup oppts. 2250 +- 265 (292 turns) The high figure for Adams getting wiped out 5.5-0.5 is surprising, but at least it means my program doesn't simply punish people who lose a lot of games. 1991: Hitech 2165 +- 400 (204 turns) vs. AEGON oppts. 2480 +- 325 (203 turns) 1992: Hitech 2325 +- 265 (205 turns) vs. AEGON oppts. 2655 +- 225 (199 turns) 1993: Hitech 2165 +- 430 (182 turns) vs. AEGON oppts. 2360 +- 420 (180 turns) 1994: Hitech 2780 +- 270 (166 turns) vs. AEGON oppts. 2445 +- 355 (168 turns) 1995: Hitech 1605 +- 825 (116 turn s) vs. AEGON oppts. 1245 +- 630 (113 turns) (what happened there? High-error game vs. Nico Kuijf) 1996: Hitech 2515 +- 265 (262 turns) vs. AEGON oppts. 2195 +- 235 (258 turns)