Zappa (chess)

Zappa
Developer(s) Anthony Cozzie, Zach Wegner (since 2010)
Initial release February 2, 2005 (2005-02-02)
Stable release Zappa Mexico II / 2009 (2009)
Development status Discontinued
Operating system Microsoft Windows, Linux
Type Chess engine
License Proprietary
Website Official website

Zappa, Zap!Chess or Zappa Mexico, is a UCI chess engine written by Anthony Cozzie, a graduate student at the University of Illinois at Urbana-Champaign. The program emphasizes sound search and a good use of multiple processors. Earlier versions of Zappa are free (though not open-source software) and the current version (Zappa Mexico) is available at Shredder Computer Chess.[1]

History

Zappa scored an upset victory at the World Computer Chess Championship in August, 2005, in Reykjavík, Iceland where it won with a score of 10½ out of 11,[2][3][4] and beat both Junior and Shredder, programs that had won the championship many times.[5][6] In the speed chess portion of the tournament Zappa placed second, after Shredder.[7] Zappa's other tournament successes include winning CCT7 on the Internet Chess Club[8] (ICC) and defeating Grandmaster Jaan Ehlvest 3-1.[9]

In Mexico in September 2007 Zappa won a match against Rybka by a score of 5½ - 4½.[10] Many commentators had predicted a slew of draws based on the strength of the engines, but the differences in style provided an interesting match with several decisive games and many fighting draws. For some time, Zappa was considered one of the two strongest commercially available chess programs; see engine rating lists like CCRL[11] for current rankings. Some speculate that Zappa's more efficient SMP parallel search could make it stronger on enough processors.

In March 2008 Anthony Cozzie announced that "the Zappa project is 100% finished", which includes both tournaments and future releases.[12]

In June 2010, Zach Wegner announced that he had acquired the rights to maintain and improve the Zappa engine. The improved engine competed in the 2010 WCCC under the name Rondo, achieving second place behind Rybka before the latter's disqualification.[13][14][15]

Commercialization

Immediately after the successful WCCC 2005, there were plans to commercialize Zappa, but the first attempts with Vincent Diepeveen failed.[16] In April 2006,[17] a commercial version dubbed Zap!Chess running under the Fritz GUI was released by ChessBase.[18]

The version of Zappa that won the Zappa-Rybka match, Zappa Mexico, is sold by Shredder Computer Chess,[1] is compatible with Windows and Linux computers with up to 512 CPU cores and supports multipv analysis and Nalimov tablebases.

Notable games

Zappa vs Crafty, WCCC 2005
abcdefgh
8
e8 black rook
g8 black king
d7 white rook
h7 black pawn
a6 black pawn
g6 black pawn
a5 black knight
e5 black rook
g5 black queen
a3 white pawn
c3 white queen
b2 white pawn
a1 white king
b1 white bishop
d1 white rook
8
77
66
55
44
33
22
11
abcdefgh
Here Zappa played Re1, threatening Qxa5 Rxa5 Rxe8#; the game continued 43... Qf6 (if Rxe1 then Qg7#) 44. Rxe5 Qxe5 45. Ba2+ Kh8 46. Rd8 1–0.[19]

References

  1. 1 2 "Zappa Mexico". Retrieved 26 October 2013.
  2. ↑ "13th World Computer Chess Championship". IGCA. Retrieved 26 October 2013.
  3. 1 2 Cozzie, Anthony. "WCCC 2005 Photojournal". Archived from the original on 22 March 2012. Retrieved 26 October 2013.
  4. ↑ "WCCC 2005 Reykjavik". rpijl.home.xs4all.nl/. Archived from the original on 25 October 2013. Retrieved 26 October 2013.
  5. ↑ "Shredder". IGCA. Retrieved 26 October 2013.
  6. ↑ "Junior". IGCA. Retrieved 26 October 2013.
  7. ↑ "13th World Computer Chess Championship (Blitz)". IGCA. Retrieved 26 October 2013.
  8. ↑ "CCT Results". Retrieved 26 October 2013.
  9. ↑ "Report". Retrieved 26 October 2013.
  10. ↑ Cozzie, Anthony. "Match vs Rybka - Mexico 2007". Retrieved 26 October 2013.
  11. ↑ CCRL engine ratings: http://computerchess.org.uk/ccrl/4040/
  12. ↑ "Anthony Cozzie". Netfiles.uiuc.edu. Retrieved 2012-06-20.
  13. ↑ Rybka placed first but the program was found to have plagiarized Crafty and Fruit(the GPL'ed runner-up in 2005), and was stripped of its title. (Doggers, Peter. "Rybka disqualified and banned from World Computer Chess Championships". Chess Vibes. Retrieved 29 June 2011.)
  14. ↑ "Zach, is this true?". Retrieved 26 October 2013.
  15. ↑ "Zappa". ICGA.
  16. ↑ Cozzie, Anthony. "Re: Zappa Retail: No UCI?". Retrieved 26 October 2013.
  17. ↑ "World Computer Chess Champion: Zap!Chess". ChessBase. Retrieved 26 October 2013.
  18. ↑ "Zap!Chess". ChessBase. Retrieved 26 October 2013.
  19. ↑ Cozzie, Anthony. "Great moves". Retrieved 27 October 2013.

Sources

External links

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