Komodo 12.3 Plays The Ruy Lopez

Komodo is a UCI chess engine developed by Don Dailey and Mark Lefler, and supported by chess author and evaluation expert GM Larry Kaufman. Komodo is a commercial chess engine but older versions (9 and older) are free for non-commercial use. It is consistently ranked near the top of most major chess engine rating lists, along with Stockfish, Rybka and Houdini. The official website for Komodo can be found here. Komodo on Chess.Com can be found here.

Komodo heavily relies on evaluation rather than depth, and thus has a distinctive positional style. Its forte is to play when there is nothing to play. Komodo author Don Dailey described it as such: "In positions that most engines would likely struggle or find it impossible to make progress, Komodo quietly prepares a break and ends up with the victory."

The newly launched Komodo 12.3 MCTS thinks like no other chess engine in the world. Inspired by the ideas of AlphaZero and Leela, Larry and Mark set out to reinvent the Komodo chess engine. What they came up with was Komodo 12.3 MCTS - a engine which searches for candidate moves in an incredible new way, and finds moves no other engine can!?

Here is a game played by Komodo 12.3 (Black) against Strelka 5.5 (White) :

The game is again presented, with the board reversed :

Trivia : In 2013 Stockfish finished runner-up at both TCEC Seasons 4 and 5, with Superfinal scores of 23–25 first against Houdini 3 and later against Komodo 1142. Season 5 was notable for the winning Komodo team as they accepted the award posthumously for the program's creator Don Dailey, who succumbed to an illness during the final stage of the event. In his honor, the version of Stockfish that was released shortly after that season was named "Stockfish DD"