195:
3095:
817:
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
780:
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.
1052:
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.
1048:
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
836:
Major new version. Improved search and evaluation (+50 Elo), Tactical Mode, Scorpio bitbases, accelerated
Principal Variation Search "Smart Fail-High", optimized hash usage.
1018:, so a chess GUI is needed for running the engine. Houdini 5 uses calibrated evaluations in which engine scores correlate directly with the win expectancy in the position.
1646:
589:
1171:
1064:. As part of the settlement agreement, ChessBase has conceded the allegations. Houdini 6.0 is also no longer available on ChessBase's website as a result.
615:, where an attacking, sacrificial style was predominant. According to Robert Houdart, Houdini's advantage against other top engines is in its handling of
2875:
2432:
240:
2890:
2850:
2870:
582:
2865:
204:
2422:
251:
1271:
2810:
2673:
2663:
2427:
2948:
2418:
2413:
1741:
2885:
2785:
2678:
2648:
575:
1403:
2855:
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2763:
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1398:
1215:
2840:
2830:
1351:
2835:
2825:
2820:
1488:
1450:
1076:, with three championship wins to date, but since season 18 it no longer participates in TCEC due to plagiarized code (see
2970:
2880:
2815:
2396:
2158:
1709:
1127:
376:
856:
Major new version. Improved search and evaluation (+50 Elo), 6-men Syzygy table bases (coding provided by Ronald de Man)
2234:
1714:
1257:
246:
2984:
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2643:
271:
57:
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321:
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1111:"Houdini with Black pieces in the Thoresen Chess Engines Competition. Game shows Houdini playing style from 6:23"
1011:
1003:
391:
146:
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2502:
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331:
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506:
441:
266:
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1981:
1704:
1663:
1445:
351:
286:
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1243:
175:. Versions up to 1.5a are available for non-commercial use, while 2.0 and later are commercial only.
2507:
2444:
2403:
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2146:
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2066:
1880:
1811:
1736:
1621:
1420:
999:
995:
551:
160:
156:
112:
1010:
only supports up to 8 processor cores, 4 GB of hash and is not NUMA-aware. As with many other
2955:
2735:
2497:
2487:
2374:
2344:
2314:
2286:
2259:
2202:
2103:
2071:
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1986:
1699:
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1344:
531:
276:
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229:
95:
281:
3062:
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2703:
2512:
2153:
2041:
1653:
1521:
316:
261:
1026:
Houdini has had a history of allegations against it that it contains code from other engines.
3045:
2918:
2730:
2688:
2619:
2571:
2554:
2534:
2386:
2324:
2264:
2239:
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2026:
2014:
1857:
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546:
326:
168:
88:
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976:
Correction for incorrect detection of stalemate in positions with white pawn capture moves.
616:
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107:
83:
3005:
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2800:
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2009:
1971:
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1498:
916:
Major new version. Improved search and evaluation (+50-60 Elo), enhanced multi-threading.
299:
2274:
2185:
1229:
876:
Major new version, about 200 Elo stronger. Rewritten evaluation function, deeper search.
3104:
3020:
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2614:
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1393:
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612:
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344:
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216:
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2217:
2180:
2113:
2036:
2021:
1976:
1959:
1954:
1944:
1776:
1538:
1476:
561:
536:
521:
451:
386:
3099:
3025:
3010:
2740:
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2457:
2391:
2334:
2329:
2061:
2056:
1996:
1939:
1830:
1786:
1558:
1543:
1533:
1469:
1435:
1408:
1376:
1297:
1037:, which initially lead to Houdini 1.0 to not be tested in any rating lists such as
516:
409:
356:
149:
100:
762:
Maintenance update with work-arounds for Fritz GUI and other minor improvements.
2379:
2369:
2118:
2081:
1964:
1575:
1570:
1528:
1381:
1090:
TCEC Houdini - Rybka Match 2011 · Queen Pawn Game: London System (D02) · 1–0
431:
421:
194:
3015:
2076:
1912:
1902:
1835:
1819:
1511:
501:
436:
366:
25:
3030:
2359:
2319:
1922:
1917:
1806:
1781:
1506:
1201:
1057:
556:
541:
486:
461:
446:
416:
2908:
708:
Multi-PV, searchmove and large page support. Improved evaluation function.
1316:
1155:
123:
2718:
2004:
1766:
361:
799:
Maintenance update with minor bug corrections and
Nalimov EGTB support.
1440:
1030:
936:
Maintenance update with
Nalimov EGTB correction and new output option.
619:, which is why it "favors aggressive play that tries to win the game".
311:
164:
153:
1582:
1907:
896:
Maintenance update with some interface corrections and improvements.
511:
466:
426:
396:
381:
172:
1056:
On 20 July 2021, the
Stockfish team announced legal action against
1360:
1034:
526:
1128:"Interview with Robert Houdart, Mark Lefler and GM Larry Kaufman"
1060:
alleging that
Houdini 6 and Fat Fritz 2 were in violation of the
3094:
1425:
1216:"ChessBase's Fat Fritz 2 condemned as 'rip-off' Stockfish clone"
1073:
1049:
1042:
1038:
690:
SMP and hash collision bug fixes. Work-around for
Shredder GUI.
1333:
611:
Tryfon
Gavriel compared Houdini's playing style to that of the
982:
The latest stable release of
Houdini comes in two versions:
744:
Improved search and evaluation. Gaviota Table Base Support.
211:
1198:"Open Source Community Critical Of Chessbase, Fat Fritz 2"
1072:
Houdini used to be one of the most successful engines in
1329:
818:
to Strength option. Exit on detection with GUI exit.
2998:
2901:
2754:
2634:
2580:
2443:
2285:
2225:
2216:
2127:
1995:
1856:
1757:
1593:
1497:
1367:
626:
118:
106:
94:
82:
56:
34:
24:
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:
8:
19:
2222:
1352:
1338:
1330:
1151:
1149:
1092:Houdini plays a pawn sacrifice on move 43.
590:
576:
177:
18:
1033:derivative, and to have plagiarized from
1102:
185:
1029:Houdini 1.0 has been alleged to be an
607:Chess commentator and video annotator
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
7:
159:Robert Houdart. It is influenced by
1077:
14:
1274:. 7 December 2017. Archived from
1230:"Engines and authors - TCEC wiki"
3093:
2764:List of strong chess tournaments
257:Handcrafted evaluation functions
193:
63:6.03 / November 20, 2017
1742:Gökyay Association Chess Museum
1244:"Our lawsuit against ChessBase"
1014:engines, Houdini comes with no
1:
2862:Computer chess championships
994:supports up to 128 processor
1218:. chess24. 22 February 2021.
925:September 24, 2017
905:September 15, 2017
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
272:Stochastic gradient descent
3147:
2807: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
3088:
2654:Opposite-coloured bishops
945:October 1, 2017
78:
52:
2781:World Chess Championship
1747:World Chess Hall of Fame
1298:"TCEC Season 18 Engines"
1158:, Retrieved 16 June 2012
3075:Simultaneous exhibition
2985:Chess newspaper columns
2674: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
2791:Candidates Tournament
2679: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
1421:Correspondence chess
237:Deep neural networks
230:Evaluation functions
2736: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:
2966: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
3113:
3112:
2990:Chess periodicals
2919:Chess in the arts
2851:Chess composition
2689: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
3138:
3100:Chess portal
3098:
3097:
3041:Leela Chess Zero
2972:Oxford Companion
2924:early literature
2914: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:
1584:
1354:
1347:
1340:
1331:
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:
136:
133:
131:
129:
127:
125:
84:Operating system
73:
71:
66:
48:
46:
41:
22:
16:UCI chess engine
3146:
3145:
3141:
3140:
3139:
3137:
3136:
3135:
3116:
3115:
3114:
3109:
3092:
3084:
2994:
2980:Chess libraries
2897:
2801:FIDE Grand Prix
2796:Chess World Cup
2750:
2746:Wrong rook pawn
2684:Lucena position
2626:
2576:
2493:Catalan Opening
2468:English Defence
2453:Budapest Gambit
2439:
2397:Austrian Attack
2281:
2250:English Opening
2212:
2208:School of chess
2191:Minority attack
2123:
2092:Queen sacrifice
1991:
1852:
1848:White and Black
1843:Touch-move rule
1802:Perpetual check
1797:Fifty-move rule
1753:
1589:
1586:
1493:
1363:
1358:
1315:
1314:
1311:
1306:
1305:
1296:
1295:
1291:
1281:
1279:
1270:
1269:
1265:
1256:
1255:
1251:
1246:. 20 July 2021.
1242:
1241:
1237:
1228:
1227:
1223:
1214:
1213:
1209:
1196:
1195:
1191:
1181:
1179:
1170:
1169:
1162:
1154:
1147:
1137:
1135:
1126:
1125:
1121:
1110:
1108:
1104:
1099:
1086:
1070:
1024:
968:
966:
948:
946:
928:
926:
908:
906:
888:
886:
868:
866:
848:
846:
829:
827:
810:
808:
792:
790:
773:
771:
755:
753:
737:
735:
719:
717:
701:
699:
683:
681:
665:
663:
647:
645:
625:
623:Version history
605:
596:
567:
566:
412:
402:
401:
347:
345:Chess computers
337:
336:
307:
292:
291:
232:
222:
221:
207:
122:
74:
69:
67:
64:
44:
42:
39:
35:Initial release
17:
12:
11:
5:
3144:
3142:
3134:
3133:
3128:
3118:
3117:
3111:
3110:
3108:
3107:
3102:
3089:
3086:
3085:
3083:
3082:
3077:
3072:
3067:
3066:
3065:
3060:
3050:
3049:
3048:
3043:
3038:
3033:
3023:
3021:Chess composer
3018:
3013:
3008:
3002:
3000:
2996:
2995:
2993:
2992:
2987:
2982:
2977:
2976:
2975:
2968:
2963:
2953:
2952:
2951:
2946:
2941:
2936:
2931:
2926:
2916:
2911:
2905:
2903:
2899:
2898:
2896:
2895:
2894:
2893:
2888:
2883:
2878:
2876:North American
2873:
2868:
2860:
2859:
2858:
2853:
2848:
2843:
2838:
2833:
2828:
2823:
2818:
2813:
2805:
2804:
2803:
2798:
2793:
2788:
2778:
2777:
2776:
2769:Chess Olympiad
2766:
2760:
2758:
2752:
2751:
2749:
2748:
2743:
2738:
2733:
2728:
2723:
2722:
2721:
2716:
2711:
2706:
2701:
2693:
2692:
2691:
2686:
2676:
2671:
2666:
2661:
2656:
2651:
2646:
2640:
2638:
2632:
2631:
2628:
2627:
2625:
2624:
2623:
2622:
2620:Scholar's mate
2617:
2612:
2602:
2597:
2596:
2595:
2584:
2582:
2578:
2577:
2575:
2574:
2569:
2564:
2563:
2562:
2557:
2552:
2547:
2542:
2535:Queen's Gambit
2532:
2527:
2522:
2521:
2520:
2515:
2510:
2505:
2500:
2495:
2490:
2485:
2480:
2478:Benoni Defence
2473:Indian Defence
2470:
2465:
2460:
2455:
2449:
2447:
2441:
2440:
2438:
2437:
2436:
2435:
2430:
2425:
2416:
2406:
2401:
2400:
2399:
2389:
2387:Owen's Defence
2384:
2383:
2382:
2377:
2372:
2367:
2362:
2357:
2352:
2347:
2342:
2337:
2332:
2327:
2317:
2312:
2310:Modern Defence
2307:
2305:French Defence
2302:
2297:
2291:
2289:
2283:
2282:
2280:
2279:
2278:
2277:
2272:
2262:
2257:
2252:
2247:
2242:
2240:Bird's Opening
2237:
2231:
2229:
2220:
2214:
2213:
2211:
2210:
2205:
2200:
2195:
2194:
2193:
2188:
2183:
2178:
2171:Pawn structure
2168:
2163:
2162:
2161:
2151:
2150:
2149:
2139:
2133:
2131:
2125:
2124:
2122:
2121:
2116:
2111:
2106:
2101:
2096:
2095:
2094:
2084:
2079:
2074:
2069:
2064:
2059:
2054:
2049:
2044:
2039:
2034:
2029:
2024:
2019:
2018:
2017:
2015:Alekhine's gun
2007:
2001:
1999:
1993:
1992:
1990:
1989:
1984:
1979:
1974:
1969:
1968:
1967:
1962:
1957:
1952:
1947:
1937:
1932:
1931:
1930:
1928:Half-open file
1920:
1915:
1910:
1905:
1900:
1899:
1898:
1893:
1888:
1883:
1878:
1871:Chess notation
1868:
1862:
1860:
1854:
1853:
1851:
1850:
1845:
1840:
1839:
1838:
1828:
1826:Pawn promotion
1823:
1816:
1815:
1814:
1809:
1804:
1799:
1794:
1784:
1779:
1774:
1769:
1763:
1761:
1755:
1754:
1752:
1751:
1750:
1749:
1744:
1739:
1729:
1727:Women in chess
1724:
1723:
1722:
1717:
1712:
1702:
1697:
1696:
1695:
1690:
1689:
1688:
1683:
1673:
1668:
1667:
1666:
1651:
1650:
1649:
1644:
1639:
1637:Hypermodernism
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992:Houdini 6 Pro
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988:Houdini 6 Pro
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3026:Chess engine
3011:Chess boxing
2971:
2741: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:
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1007:
991:
987:
983:
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944:
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844:
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471:
377:Deep Thought
357:ChessMachine
282:Texel tuning
241:Transformers
167:/RobboLito,
150:chess engine
142:
141:
101:Chess engine
26:Developer(s)
2956:Chess books
2756: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
3120:Categories
3063:joke chess
3016:Chess club
2704: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
3046:Stockfish
3036:Deep Blue
3031:AlphaZero
2939:paintings
2731:Tablebase
2695: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
3105:Category
3058:glossary
2719:Zugzwang
2699: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
3006:Arbiter
2999:Related
2856:Solving
2846: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: (
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