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Houdini (chess)

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Maintenance update with minor bug corrections and new analysis options. MultiPV_cp option to limit multi-PV analysis to moves within a range of the best move. FiftyMoveDistance option to make the 50-move rule kick in earlier. UCI_Elo and UCI_LimitStrength options as UCI standard-compliant alternative
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First commercial release. Improved analysis capabilities, enhanced search and evaluation. Houdini Pro version for high-end users with powerful hardware (multi-core support). Chess960 support. Strength limit feature. Position learning. Save hash to file, load hash from file, never clear hash.
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revoking Houdini's championship results, and disallowing Houdini from competing. Leaked source code has seemingly been shown to produce almost identical play to Houdini 5.0 and Houdini 6.0, while containing direct references to Stockfish in the code documentation.
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Houdini 5.0 and Houdini 6.0 have been alleged to be Stockfish 8 derivatives without providing the sources on request, and thus, violating the GPL license. This has resulted in
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Major new version. Improved search and evaluation (+50 Elo), Tactical Mode, Scorpio bitbases, accelerated Principal Variation Search "Smart Fail-High", optimized hash usage.
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Major new version. Improved search and evaluation (+50 Elo), 6-men Syzygy table bases (coding provided by Ronald de Man)
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only supports up to 8 processor cores, 4 GB of hash and is not NUMA-aware. As with many other
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Houdini has had a history of allegations against it that it contains code from other engines.
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Correction for incorrect detection of stalemate in positions with white pawn capture moves.
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Major new version. Improved search and evaluation (+50-60 Elo), enhanced multi-threading.
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Major new version, about 200 Elo stronger. Rewritten evaluation function, deeper search.
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Maintenance update with work-arounds for Fritz GUI and other minor improvements.
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TCEC Houdini - Rybka Match 2011 · Queen Pawn Game: London System (D02) · 1–0
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Multi-PV, searchmove and large page support. Improved evaluation function.
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Maintenance update with minor bug corrections and Nalimov EGTB support.
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Maintenance update with Nalimov EGTB correction and new output option.
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Maintenance update with some interface corrections and improvements.
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On 20 July 2021, the Stockfish team announced legal action against
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alleging that Houdini 6 and Fat Fritz 2 were in violation of the
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SMP and hash collision bug fixes. Work-around for Shredder GUI.
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Tryfon Gavriel compared Houdini's playing style to that of the
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The latest stable release of Houdini comes in two versions:
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Improved search and evaluation. Gaviota Table Base Support.
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Houdini used to be one of the most successful engines in
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to Strength option. Exit on detection with GUI exit.
3122: 1172:"Free Houdini beats commercial Rybka 23.5-16.5" 956:Maintenance update with Polyglot book support. 1326:about the genesis and strengths of his program 1174:. Chessvibes. 10 February 2010. Archived from 1345: 1258:"Settlement Reached in Stockfish v ChessBase" 1166: 1164: 583: 1352: 1338: 1161: 1151: 1149: 1092:Houdini plays a pawn sacrifice on move 43. 590: 576: 1033:derivative, and to have plagiarized from 1146: 3123: 1067: 1029:Houdini 1.0 has been alleged to be an 607:Chess commentator and video annotator 1333: 1272:"Houdini is TCEC Season 10 champion!" 672:Bug fixes, improved search algorithm 252:Efficiently updatable neural networks 181:This article is part of the series on 159:Robert Houdart. It is influenced by 13: 1077: 622: 14: 3147: 1308: 1274:. 7 December 2017. Archived from 1230:"Engines and authors - TCEC wiki" 3098: 2769:List of strong chess tournaments 1083: 1021: 602: 257:Handcrafted evaluation functions 193: 63:6.03 / November 20, 2017 1742:Gökyay Association Chess Museum 1290: 1264: 1244:"Our lawsuit against ChessBase" 1014:engines, Houdini comes with no 1250: 1236: 1222: 1208: 1190: 1120: 1103: 1: 2867:Computer chess championships 1096: 994:supports up to 128 processor 1218:. chess24. 22 February 2021. 925:September 24, 2017 905:September 15, 2017 7: 2644:Bishop and knight checkmate 965:November 20, 2017 885:November 15, 2016 845:November 25, 2013 807:November 20, 2011 770:September 1, 2011 734:December 15, 2010 626: 272:Stochastic gradient descent 10: 3152: 2812:Other world championships 1062:GNU General Public License 865:November 7, 2016 826:October 15, 2012 789:November 7, 2011 752:January 15, 2011 322:Principal variation search 3093: 3003: 2906: 2759: 2654:Opposite-coloured bishops 2634: 2580: 2443: 2285: 2225: 2216: 2127: 1995: 1856: 1757: 1593: 1497: 1367: 1359: 945:October 1, 2017 118: 106: 94: 82: 78: 56: 52: 34: 24: 2786:World Chess Championship 1747:World Chess Hall of Fame 1298:"TCEC Season 18 Engines" 1158:, Retrieved 16 June 2012 3080:Simultaneous exhibition 2990:Chess newspaper columns 2679:Rook and bishop vs rook 2664:Queen and pawn vs queen 716:July 17, 2010 698:July 15, 2010 680:June 18, 2010 332:Monte Carlo tree search 2530:Richter–Veresov Attack 2518:Queen's Indian Defence 1324:Interview with Houdart 662:June 1, 2010 644:May 15, 2010 442:Dragon by Komodo Chess 267:Reinforcement learning 40:; 14 years ago 2796:Candidates Tournament 2684:Rook and pawn vs rook 2649:King and pawn vs king 2600:List of chess gambits 2503:King's Indian Defence 2181:Isolated Queen's Pawn 1705:List of chess players 1647:Top player comparison 1446:Internet chess server 726:Bug fix for Multi-PV 613:Romantic Era of chess 287:Unsupervised learning 205:Board representations 65:; 6 years ago 2508:Nimzo-Indian Defence 2404:Scandinavian Defense 2365:Semi-Italian Opening 2270:King's Indian Attack 2159:first-move advantage 1812:Threefold repetition 1737:Bobby Fischer Center 1622:Charlemagne chessmen 1616:Göttingen manuscript 1580: 1421:Correspondence chess 237:Deep neural networks 230:Evaluation functions 2741:Two knights endgame 2488:Bogo-Indian Defence 2375:Two Knights Defense 2315:Nimzowitsch Defence 2005:Artificial castling 1642:Soviet chess school 1517:Dubrovnik chess set 1260:. 21 November 2022. 1204:. 25 February 2021. 1134:. November 23, 2017 1068:Competition results 277:Supervised learning 262:Piece-square tables 21: 2971:endgame literature 2513:Old Indian Defense 2423:Accelerated Dragon 2295:Alekhine's Defence 2027:Checkmate patterns 1896:symbols in Unicode 1891:annotation symbols 1654:Geography of chess 1522:Staunton chess set 1278:on 6 November 2020 1008:Houdini 5 Standard 984:Houdini 6 Standard 317:Alpha-beta pruning 19: 3118: 3117: 2995:Chess periodicals 2924:Chess in the arts 2856:Chess composition 2694:Philidor position 2630: 2629: 2572:Trompowsky Attack 2555:Semi-Slav Defence 2445:Queen's Pawn Game 2325:Four Knights Game 2300:Caro–Kann Defence 2265:Zukertort Opening 2052:Discovered attack 1772:Cheating in chess 1609:Versus de scachis 998:, 128 GB of 980: 979: 600: 599: 327:Quiescence search 306:search algorithms 187:Chess programming 140: 139: 89:Microsoft Windows 38:May 15, 2010 3143: 3105:Chess portal 3103: 3102: 3046:Leela Chess Zero 2977:Oxford Companion 2929:early literature 2919:Chess aesthetics 2659:Pawnless endgame 2610:Bongcloud Attack 2588:List of openings 2560:Chigorin Defense 2498:GrĂĽnfeld Defence 2409:Sicilian Defence 2355:Ponziani Opening 2350:Philidor Defence 2345:Petrov's Defence 2287:King's Pawn Game 2260:Larsen's Opening 2223: 2222: 1584: 1354: 1347: 1340: 1331: 1330: 1320: 1319: 1317:Official website 1302: 1301: 1294: 1288: 1287: 1285: 1283: 1268: 1262: 1261: 1254: 1248: 1247: 1240: 1234: 1233: 1226: 1220: 1219: 1212: 1206: 1205: 1194: 1188: 1187: 1185: 1183: 1178:on 10 April 2014 1168: 1159: 1153: 1144: 1143: 1141: 1139: 1124: 1118: 1112: 1107: 972: 970: 952: 950: 932: 930: 912: 910: 892: 890: 872: 870: 852: 850: 833: 831: 814: 812: 796: 794: 777: 775: 759: 757: 741: 739: 723: 721: 705: 703: 687: 685: 669: 667: 651: 649: 627: 592: 585: 578: 497:Leela Chess Zero 197: 178: 177: 136: 133: 131: 129: 127: 125: 84:Operating system 73: 71: 66: 48: 46: 41: 22: 18: 16:UCI chess engine 3151: 3150: 3146: 3145: 3144: 3142: 3141: 3140: 3121: 3120: 3119: 3114: 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2573: 2570: 2568: 2565: 2561: 2558: 2556: 2553: 2551: 2548: 2546: 2543: 2541: 2538: 2537: 2536: 2533: 2531: 2528: 2526: 2525:London System 2523: 2519: 2516: 2514: 2511: 2509: 2506: 2504: 2501: 2499: 2496: 2494: 2491: 2489: 2486: 2484: 2483:Modern Benoni 2481: 2479: 2476: 2475: 2474: 2471: 2469: 2466: 2464: 2463:Dutch Defence 2461: 2459: 2456: 2454: 2451: 2450: 2448: 2446: 2442: 2434: 2431: 2429: 2426: 2424: 2420: 2417: 2415: 2412: 2411: 2410: 2407: 2405: 2402: 2398: 2395: 2394: 2393: 2390: 2388: 2385: 2381: 2378: 2376: 2373: 2371: 2368: 2366: 2363: 2361: 2358: 2356: 2353: 2351: 2348: 2346: 2343: 2341: 2340:King's Gambit 2338: 2336: 2333: 2331: 2328: 2326: 2323: 2322: 2321: 2318: 2316: 2313: 2311: 2308: 2306: 2303: 2301: 2298: 2296: 2293: 2292: 2290: 2288: 2284: 2276: 2273: 2271: 2268: 2267: 2266: 2263: 2261: 2258: 2256: 2255:Grob's Attack 2253: 2251: 2248: 2246: 2245:Dunst Opening 2243: 2241: 2238: 2236: 2235:Benko Opening 2233: 2232: 2230: 2228: 2227:Flank opening 2224: 2221: 2219: 2215: 2209: 2206: 2204: 2201: 2199: 2196: 2192: 2189: 2187: 2184: 2182: 2179: 2177: 2174: 2173: 2172: 2169: 2167: 2164: 2160: 2157: 2156: 2155: 2152: 2148: 2145: 2144: 2143: 2140: 2138: 2135: 2134: 2132: 2130: 2126: 2120: 2117: 2115: 2112: 2110: 2107: 2105: 2102: 2100: 2097: 2093: 2090: 2089: 2088: 2085: 2083: 2080: 2078: 2075: 2073: 2070: 2068: 2065: 2063: 2060: 2058: 2055: 2053: 2050: 2048: 2045: 2043: 2040: 2038: 2035: 2033: 2030: 2028: 2025: 2023: 2020: 2016: 2013: 2012: 2011: 2008: 2006: 2003: 2002: 2000: 1998: 1994: 1988: 1985: 1983: 1982:Transposition 1980: 1978: 1975: 1973: 1970: 1966: 1963: 1961: 1958: 1956: 1953: 1951: 1948: 1946: 1943: 1942: 1941: 1938: 1936: 1933: 1929: 1926: 1925: 1924: 1921: 1919: 1916: 1914: 1911: 1909: 1906: 1904: 1901: 1897: 1894: 1892: 1889: 1887: 1884: 1882: 1879: 1877: 1874: 1873: 1872: 1869: 1867: 1864: 1863: 1861: 1859: 1855: 1849: 1846: 1844: 1841: 1837: 1834: 1833: 1832: 1829: 1827: 1824: 1822: 1821: 1817: 1813: 1810: 1808: 1805: 1803: 1800: 1798: 1795: 1793: 1790: 1789: 1788: 1785: 1783: 1780: 1778: 1775: 1773: 1770: 1768: 1765: 1764: 1762: 1760: 1756: 1748: 1745: 1743: 1740: 1738: 1735: 1734: 1733: 1732:Chess museums 1730: 1728: 1725: 1721: 1718: 1716: 1713: 1711: 1708: 1707: 1706: 1703: 1701: 1700:Notable games 1698: 1694: 1691: 1687: 1684: 1682: 1679: 1678: 1677: 1674: 1672: 1669: 1665: 1662: 1661: 1660: 1657: 1656: 1655: 1652: 1648: 1645: 1643: 1640: 1638: 1635: 1633: 1630: 1628: 1625: 1623: 1620: 1618: 1617: 1613: 1611: 1610: 1606: 1605: 1604: 1601: 1600: 1598: 1596: 1592: 1585: 1579: 1577: 1574: 1572: 1569: 1565: 1562: 1560: 1557: 1555: 1552: 1550: 1547: 1545: 1542: 1540: 1537: 1535: 1532: 1531: 1530: 1527: 1523: 1520: 1518: 1515: 1513: 1510: 1509: 1508: 1505: 1504: 1502: 1500: 1496: 1490: 1489:World records 1487: 1483: 1480: 1479: 1478: 1475: 1471: 1468: 1466: 1463: 1462: 1461: 1460:Rating system 1458: 1452: 1449: 1448: 1447: 1444: 1442: 1439: 1438: 1437: 1434: 1432: 1429: 1427: 1424: 1422: 1419: 1415: 1412: 1410: 1407: 1405: 1402: 1400: 1397: 1396: 1395: 1392: 1388: 1385: 1384: 1383: 1380: 1378: 1375: 1374: 1372: 1370: 1366: 1362: 1355: 1350: 1348: 1343: 1341: 1336: 1335: 1332: 1325: 1322: 1318: 1313: 1312: 1299: 1293: 1277: 1273: 1267: 1259: 1253: 1245: 1239: 1231: 1225: 1217: 1211: 1203: 1199: 1193: 1177: 1173: 1167: 1165: 1157: 1152: 1150: 1133: 1129: 1123: 1117: 1113: 1106: 1102: 1091: 1088: 1087: 1084:Notable games 1081: 1079: 1078:Controversies 1075: 1065: 1063: 1059: 1054: 1051: 1046: 1044: 1040: 1036: 1032: 1027: 1022:Controversies 1019: 1017: 1013: 1009: 1005: 1001: 997: 993: 992:Houdini 6 Pro 989: 988:Houdini 6 Pro 985: 975: 973: 963: 960: 959: 955: 953: 943: 940: 939: 935: 933: 923: 920: 919: 915: 913: 903: 900: 899: 895: 893: 883: 880: 879: 875: 873: 863: 860: 859: 855: 853: 843: 840: 839: 835: 825: 822: 821: 816: 806: 803: 802: 798: 788: 785: 784: 779: 769: 766: 765: 761: 751: 748: 747: 743: 733: 730: 729: 725: 715: 712: 711: 707: 697: 694: 693: 689: 679: 676: 675: 671: 661: 658: 657: 653: 643: 640: 639: 635: 633:Release date 632: 629: 628: 620: 618: 614: 610: 603:Playing style 593: 588: 586: 581: 579: 574: 573: 571: 570: 563: 560: 558: 555: 553: 550: 548: 545: 543: 540: 538: 535: 533: 530: 528: 525: 523: 520: 518: 515: 513: 510: 508: 505: 503: 500: 498: 495: 493: 490: 488: 485: 483: 480: 478: 475: 473: 470: 468: 465: 463: 460: 458: 455: 453: 450: 448: 445: 443: 440: 438: 435: 433: 430: 428: 425: 423: 420: 418: 415: 414: 411: 410:Chess engines 406: 405: 398: 395: 393: 390: 388: 385: 383: 380: 378: 375: 373: 370: 368: 365: 363: 360: 358: 355: 353: 350: 349: 346: 341: 340: 333: 330: 328: 325: 323: 320: 318: 315: 313: 310: 309: 305: 301: 296: 295: 288: 285: 283: 280: 278: 275: 273: 270: 268: 265: 263: 260: 258: 255: 253: 250: 248: 245: 242: 238: 235: 234: 231: 226: 225: 218: 215: 213: 210: 209: 206: 201: 200: 196: 192: 191: 188: 185: 184: 180: 179: 176: 174: 170: 166: 162: 158: 155: 152:developed by 151: 148: 144: 135: 121: 117: 114: 111: 109: 105: 102: 99: 97: 93: 90: 87: 85: 81: 77: 61: 59: 55: 51: 37: 33: 29: 27: 23: 3031:Chess engine 3016:Chess boxing 2976: 2746:Wrong bishop 2593:theory table 2567:Torre Attack 2550:Slav Defence 2458:Colle System 2433:Scheveningen 2392:Pirc Defence 2335:Italian Game 2330:Giuoco Piano 2275:RĂ©ti Opening 2198:Piece values 2186:MarĂłczy Bind 2147:the exchange 2137:Compensation 2067:Interference 2057:Double check 1831:Time control 1818: 1792:by agreement 1720:grandmasters 1664:South Africa 1614: 1607: 1583:Score sheets 1529:Chess pieces 1436:Online chess 1382:Chess titles 1377:Chess theory 1292: 1280:. Retrieved 1276:the original 1266: 1252: 1238: 1224: 1210: 1192: 1180:. Retrieved 1176:the original 1138:November 24, 1136:. Retrieved 1132:chessdom.com 1131: 1122: 1105: 1071: 1055: 1047: 1028: 1025: 1007: 991: 987: 983: 981: 964: 944: 924: 904: 884: 864: 844: 606: 471: 377:Deep Thought 357:ChessMachine 282:Texel tuning 241:Transformers 167:/RobboLito, 150:chess engine 142: 141: 101:Chess engine 26:Developer(s) 2961:Chess books 2761:Tournaments 2615:Fool's mate 2380:Vienna Game 2370:Scotch Game 2203:Prophylaxis 2119:Zwischenzug 2104:Undermining 2072:Overloading 2032:Combination 1881:descriptive 1576:Chess table 1571:Chess clock 1387:Grandmaster 432:CuckooChess 422:Chess Tiger 161:open-source 113:Proprietary 3125:Categories 3068:joke chess 3021:Chess club 2709:opposition 2166:Middlegame 2154:Initiative 2077:Pawn storm 2042:Deflection 1913:Key square 1903:Fianchetto 1836:Fast chess 1820:En passant 1512:chessboard 1282:7 December 1182:25 October 1097:References 969:2017-11-20 949:2017-10-01 929:2017-09-24 909:2017-09-15 889:2016-11-15 869:2016-11-07 849:2013-11-25 830:2012-10-15 811:2011-11-20 793:2011-11-07 774:2011-09-01 756:2011-01-15 738:2010-12-15 720:2010-07-17 702:2010-07-15 684:2010-06-18 666:2010-06-01 648:2010-05-15 502:MChess Pro 437:Deep Fritz 367:Cray Blitz 157:programmer 70:2017-11-20 45:2010-05-15 3051:Stockfish 3041:Deep Blue 3036:AlphaZero 2944:paintings 2736:Tablebase 2700:Strategy 2605:Irregular 2360:Ruy Lopez 2320:Open Game 2087:Sacrifice 2047:Desperado 1950:connected 1923:Open file 1918:King walk 1876:algebraic 1807:Stalemate 1782:Checkmate 1507:Chess set 1499:Equipment 1202:chess.com 1058:ChessBase 636:Features 557:Turochamp 547:Stockfish 542:SmarThink 487:KnightCap 462:GNU Chess 447:Fairy-Max 417:AlphaZero 372:Deep Blue 247:Attention 217:Bitboards 169:Stockfish 3110:Category 3063:glossary 2724:Zugzwang 2704:fortress 2636:Endgames 2545:Declined 2540:Accepted 2218:Openings 2176:Hedgehog 2142:Exchange 2129:Strategy 2109:Windmill 1960:isolated 1945:backward 1767:Castling 1710:amateurs 1603:Timeline 1477:Variants 1431:Glossary 1414:software 1399:glossary 1006:-aware, 630:Version 532:Shredder 392:Mephisto 362:ChipTest 163:engines 132:/houdini 3011:Arbiter 3004:Related 2861:Solving 2851:Amateur 2428:Najdorf 2010:Battery 1997:Tactics 1972:Swindle 1955:doubled 1935:Outpost 1866:Blunder 1681:Armenia 1595:History 1441:Premove 1409:engines 1404:matches 1369:Outline 1116:YouTube 1031:IPPOLIT 967: ( 947: ( 927: ( 907: ( 887: ( 867: ( 847: ( 828: ( 809: ( 791: ( 772: ( 754: ( 736: ( 718: ( 700: ( 682: ( 664: ( 646: ( 507:Mittens 472:Houdini 312:Minimax 165:IPPOLIT 154:Belgian 143:Houdini 126:.cruxis 119:Website 108:License 68: ( 43: ( 20:Houdini 2949:poetry 2939:novels 2914:CaĂŻssa 2846:Senior 2836:Junior 2419:Dragon 2414:Alapin 2099:Skewer 1965:passed 1908:Gambit 1715:female 1676:Europe 1659:Africa 1554:Knight 1549:Bishop 1156:Cruxis 713:1.03a 512:MuZero 492:Komodo 482:Junior 477:Ikarus 467:HIARCS 427:Crafty 397:Saitek 382:HiTech 173:Crafty 171:, and 130:/chess 2896:WCSCC 2841:Youth 2831:Blitz 2826:Rapid 2816:Women 2779:Women 2731:Study 2581:Other 2114:X-ray 2037:Decoy 2022:Block 1977:Tempo 1940:Pawns 1858:Terms 1777:Check 1759:Rules 1693:India 1686:Spain 1671:China 1564:Fairy 1539:Queen 1470:norms 1361:Chess 1035:Rybka 996:cores 961:6.03 941:6.02 921:6.01 881:5.01 804:2.0c 786:2.0b 749:1.5a 695:1.03 677:1.02 659:1.01 562:Zappa 552:Torch 537:Sjeng 527:Rybka 522:REBEL 457:Fruit 452:Fritz 387:Hydra 352:Belle 300:Graph 145:is a 2934:film 2891:WCCC 2886:TCEC 2876:CSVN 2821:Team 2791:List 2062:Fork 1987:Trap 1787:Draw 1559:Pawn 1544:Rook 1534:King 1482:List 1451:list 1426:FIDE 1284:2017 1184:2013 1140:2017 1074:TCEC 1050:TCEC 1043:CEGT 1041:and 1039:CCRL 1004:NUMA 986:and 901:6.0 861:5.0 841:4.0 823:3.0 767:2.0 731:1.5 641:1.0 517:Naum 304:tree 302:and 212:0x88 134:.htm 128:.com 96:Type 2871:CCC 2082:Pin 1886:PGN 1114:on 1080:). 1016:GUI 1012:UCI 1000:RAM 147:UCI 124:www 3127:: 1200:. 1163:^ 1148:^ 1130:. 1045:. 990:. 609:CM 2421:/ 1353:e 1346:t 1339:v 1286:. 1232:. 1186:. 1142:. 971:) 951:) 931:) 911:) 891:) 871:) 851:) 832:) 813:) 795:) 776:) 758:) 740:) 722:) 704:) 686:) 668:) 650:) 591:e 584:t 577:v 243:) 239:( 72:) 47:)

Index

Developer(s)
Stable release
Operating system
Microsoft Windows
Type
Chess engine
License
Proprietary
www.cruxis.com/chess/houdini.htm
UCI
chess engine
Belgian
programmer
open-source
IPPOLIT
Stockfish
Crafty
Chess programming

Board representations
0x88
Bitboards
Evaluation functions
Deep neural networks
Transformers
Attention
Efficiently updatable neural networks
Handcrafted evaluation functions
Piece-square tables
Reinforcement learning

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.

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