"Clash of the Computer Titans"

Press release of match Rybka Zappa

From 20 th to 27 th of September Mexico will host a Computer match between the two strongest chess programs of the world, played during the Final of the World Chess Championship among humans. The program Rybka ( World Computer Chess Champion 2007) will play against Zappa ( World Computer Chess Champion 2005, and vice champion in 2007).
Both programs are well-known worldwide and head rating-lists of all independent agencies of chess programs CCRL and CEGT. The match will consist of 10 games with time control 60 minutes per game plus 20 seconds per move.

The match will consist of 10 games, with a time control 60 minutes per game plus 20 seconds per move.

The schedule of the games:

20th Sep Game 1
21st Sep Game 2
22nd Sep Games 3 and 4
23rd Sep Game 5
24th Sep Game 6
25th Sep Game 7
26th Sep Games 8 and 9
27th Sep Game 10

The event will take place in Hotel Centro Historico Sheraton in Mexico City . The match will be played on two identical 8-cores computers. The prize fund of the match is 10, 000 USD (the winner takes all). In case of a tied match the prize fund will be shared equally.


Rybka leads every major rating list by at least 60 Elo and has taken unshared first place in ten out of the eleven major international tournaments in which she has participated, including the 2007 ICGA World Computer Chess Championship and the 2007 Livingston World Computer Chess960 Championship. In addition, she has won three matches giving handicaps to prominent grandmasters.

She most commonly plays her games in a natural, classical style, logically and consistently exploiting positional trumps and leaving the viewer with the impression that chess really is quite simple.

The US international master Vasik Rajlich is the inventor and main developer. He has been joined by another US international master, Larry Kaufman, himself a former computer chess author, who has taken over work on Rybka's evaluation function. The Rybka opening book effort is headed by the long-time Dutch computer chess opening specialist Jeroen Noomen, who is assisted by the Danish opening and computer chess specialist Dagh Nielsen.

Vasik Rajlich
Vasik Rajlich


Zappa is a chess engine, or a program that plays chess. It is similar to Deep Blue - only much better - and is best known for its good parallel speedup. It has competed in many computer chess tournaments with its best result coming at the World Computer Chess Championship in 2005, where it took first place with the score of 10.5/11, the best result in the history of that competition. Written by Anthony Cozzie (the USA ), a PhD student in computer science, Zappa contains many advanced techniques from the fields of artificial intelligence and parallel programming.

Anthony Cozzie
Anthony Cozzie