Komodo (chess)

Komodo and Dragon by Komodo Chess (also known as Dragon or Komodo Dragon) are UCI chess engines developed by Komodo Chess,[1] which is a part of Chess.com.[2] The engines were originally authored by Don Dailey and GM Larry Kaufman. Dragon is a commercial chess engine, but Komodo is free for non-commercial use.[3] Dragon is consistently ranked near the top of most major chess engine rating lists, along with Stockfish and Leela Chess Zero.[4][5][6][7][8]

Komodo
Original author(s)
Developer(s)Komodo Chess, Chess.com
Initial releaseJanuary 2010 (2010-01)
Stable release
Komodo 14.1 / November 2, 2020 (2020-11-02)
Written inC, C++
Operating systemLinux, Microsoft Windows, Mac OS X, Android
PredecessorDoch
SuccessorDragon
TypeChess engine
LicenseProprietary
Websitekomodochess.com
Dragon by Komodo Chess
Developer(s)Komodo Chess, Chess.com
Initial releaseNovember 9, 2020 (2020-11-09)
Stable release
Dragon 3.2 / December 17, 2022 (2022-12-17)
Written inC, C++
Operating systemLinux, Microsoft Windows, Mac OS X, Android
PredecessorKomodo
TypeChess engine
LicenseProprietary
Websitekomodochess.com

History

Komodo

Komodo logo

Komodo was derived from Don Dailey's former engine Doch in January 2010.[9] The first multiprocessor version of Komodo was released in June 2013 as Komodo 5.1 MP.[10] This version was a major rewrite and a port of Komodo to C++11. A single-processor version of Komodo (which won the CCT15 tournament in February earlier that year) was released as a stand-alone product shortly before the 5.1 MP release. This version, named Komodo CCT, was still based on the older C code, and was approximately 30 Elo stronger than the 5.1 MP version, as the latter was still undergoing massive code-cleanup work.[11]

With the release of Komodo 6 on October 4, 2013, Don Dailey announced that he was suffering from an acute form of leukaemia, and would no longer contribute to the future development of Komodo.[12] On October 8, Don made an announcement on the Talkchess forum that Mark Lefler would be joining the Komodo team and would continue its development.[13]

Komodo TCEC was released on December 4, 2013. This was the same version that had won TCEC Season 5, and was the last with input from Don Dailey, to whom it was dedicated.[14] Komodo 7 was released on May 21, 2014, adding Syzygy tablebase support.[15]

On May 24, 2018, Chess.com announced that it has acquired Komodo and that the Komodo team have joined Chess.com.[2] The Komodo team is now called Komodo Chess.[1]

On December 17, 2018, Komodo Chess released Komodo 12.3 MCTS, a version of the Komodo 12.3 engine that uses Monte Carlo tree search instead of alpha–beta pruning/minimax.[16]

The latest version, Komodo 14.1, was released on November 2, 2020.[17]

Dragon

On November 9, 2020, Komodo Chess released Dragon by Komodo Chess 1.0, which features the use of efficiently updatable neural networks in its evaluation function. Dragon is derived from Komodo in the same way that Komodo was derived from Doch.[18][19] Dragon is also called Komodo Dragon in certain tournaments such as the Top Chess Engine Championship and the World Computer Chess Championship (WCCC) but not in the Chess.com Computer Chess Championship (CCC). A Chess.com staff member named Dmitry Pervov joined the Dragon development team to write the NNUE code for Dragon, and Dietrich Kappe joined the Dragon development team to help Larry Kaufman and Mark Lefter train Dragon's neural networks.[20]

The latest version, Dragon 3.2, was released on December 17, 2022.[21] On March 17, 2023, Larry Kaufman announced that he and Mark Lefter have stepped down from Dragon development and from ownership of Komodo Chess, and that Chess.com have taken full control of Komodo Chess. As of March 17, 2023, Dietrich Kappe is the only person responsible for the development of Dragon, but Chess.com are looking for more programmers to help with Dragon development.[22]

Competition results

Komodo

Komodo has played in the ICT 2010 in Leiden, and further in the CCT12 and CCT14. Komodo had its first tournament success in 1999, when it won the CCT15 with a score of 6½/7.[23] Komodo also fared very well in the TCEC competition, where in Season 4, it lost only eight out of its 53 games and managed to reach Stage 4 (Quarterfinals), against very strong competition which were running on eight cores (Komodo was running on a single processor).[24] In TCEC Season 5, it won the superfinal against Stockfish. It managed to reach the Superfinal in TCEC Season 6 again, but this time, it lost to Stockfish. Komodo regained the title in TCEC Season 7, defeating Stockfish in the superfinal. In TCEC Season 8, Komodo defeated Stockfish again in the superfinal.[25] Komodo won both the World Computer Chess Championship[26] and World Computer Software Championship[27] in 2016. Komodo once again won the World Computer Chess Championship[28] and World Blitz[29] in 2017. Komodo came third in TCEC Season 11 losing to Stockfish and Houdini, and came second in Season 12 losing to Stockfish.[30][31][32]

Chess.com Computer Chess Championship

Main Events
EventYearTime ControlsResultRef
CCC 1 2018 15+5 4th [33]
CCC 2 2018 5+2 2nd [34]
CCC 3 2019 30+5 3rd [35]
CCC 4 2019 1+2 4th [36]
CCC 5 2019 10+5 4th [37]
CCC 6 2019 10+10 7th [38]
CCC 7 2019 5+2 6th [39]
CCC 8 2019 15+5 6th [40]
CCC 9 2019 5+2 5th [41]
CCC 10 2019 10+3 4th [42]
CCC 11 2019 30+5 4th [43]
CCC 12 2020 1+1 4th [44]
CCC 13 2020 10+5 4th [45]
CCC 14 2020 10+3 5th [46]
CCC Blitz 2020 2020 5+5 9th [47]
CCC Blitz 2021 2021 5+5 10th [48]
CCC Chess 960 Blitz 2021 5+5 9th [49]

Chess.com Computer Chess Championship

Main Events
EventYearTime ControlsResultRef
CCC Blitz 2020 2020 5+5 3rd [50]
CCC Rapid 2021 2021 15+3 3rd [51]
CCC Blitz 2021 2021 5+5 3rd [52]
CCC Chess 960 Blitz 2021 5+5 2nd [53]
CCC 16: Rapid 2021 15+3 3rd [54]
CCC 16: Bullet 2021 2+1 2nd [55]
CCC 16: Blitz 2022 5+5 2nd [56]
CCC 17: Rapid 2022 15+3 2nd [57]
CCC 17: Bullet 2022 2+1 2nd [58]
CCC 17: Blitz 2022 5+5 3rd [59]
CCC 18: Rapid 2022 15+3 3rd [60]
CCC 19: Blitz 2022 5+5 2nd [61]
CCC 19: Rapid 2022 15+3 3rd [62]
CCC 19: Bullet 2023 1+1 2nd [63]
CCC 20: Blitz 2023 3+2 3rd [64]
CCC 20: Rapid 2023 10+3 3rd [65]
CCC 20: Bullet 2023 1+1 3rd [66]
CCC 21: Blitz 2023 3+2 4th [67]
CCC 21: Rapid 2023 10+3 4th [68]

Top Chess Engine Championship

Main Events
EventYearTime ControlsResultRef
Season 20 2020 60+7 3rd [69]
Season 21 2021 90+9 3rd [70]
Season 22 2022 120+12 2nd [71]
Season 23 2022 60+6 3rd [72]
Season 24 2023 60+6 3rd [73]
Cup
EventYearTime ControlsResultRef
Cup 8 2021 30+5 3rd [74]
Cup 9 2021 30+5 3rd [75]
Cup 10 2022 30+3 2nd [76]
Cup 11 2023 30+3 3rd [77]
Fischer random chess (FRC)
EventYearTime ControlsResultRef
FRC 3 2021 30+5 1st [78]
FRC 4 2022 30+5 3rd [79]
Swiss
EventYearTime ControlsResultRef
Swiss 1 2021 45+7 1st [80]
Swiss 2 2022 45+7 1st [81]
Swiss 3 2022 45+4.5 4th [82]
Swiss 4 2023 30+3 2nd [83]

Notable games

Komodo vs Hannibal
abcdefgh
8
a8 black rook
d7 black bishop
e7 black rook
g7 black king
h7 black pawn
c6 black pawn
f6 black pawn
g6 black pawn
b5 black pawn
c5 white rook
d5 black pawn
a4 black pawn
b4 white pawn
d4 white pawn
f4 white pawn
h4 white pawn
e3 white pawn
a2 white pawn
f2 white pawn
g2 white bishop
c1 white rook
g1 white king
8
77
66
55
44
33
22
11
abcdefgh
Komodo plays the exchange sacrifice 33. Rxc6 and goes on to win the game, proving the superiority of its pieces over Black's two rooks.

References

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