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was a 10 game computer chess match between [[Zappa]] and [[Rybka]], held from September 20 to 27, [[Timeline#2007|2007]] as frame program during the final of the [https://en.wikipedia.org/wiki/World_Chess_Championship_2007 World Chess Championship 2007] in [https://en.wikipedia.org/wiki/Mexico_City Mexico City], [https://en.wikipedia.org/wiki/Mexico Mexico].
The match was scheduled after Rybka author [[Vasik Rajlich]] made a $100,000 publicity challenge in May 2007 to the [[FIDE]], to play the winner of the [[Deep Fritz versus Deep Junior 2007]] match, [[Fritz|Deep Fritz]] or [[Junior|Deep Junior]], even offering odds of a game in a 24 game match <ref>[http://www.talkchess.com/forum/viewtopic.php?t=14159 Open Letter & $100,000 challenge to FIDE] by [[Vasik Rajlich]], [[CCC]], May 31, 2007</ref> <ref>[http://www.rybkachess.com/docs/ChallengeToFIDE.htm An Open Letter and $100,000 challenge to FIDE President Kirsan N. Ilyumzhinov] by [[Vasik Rajlich]], May 31, 2007</ref>,
but negotiations between Rybka and Junior teams broke down due to disputes over on-site machines <ref>[http://www.chessninja.com/download/rybka-junior-nomatch-levy.pdf A Lost Opportunity] by [[David Levy]], hosted by [http://chessninja.com/ chessninja.com]</ref> <ref>[https://en.wikipedia.org/wiki/Rybka#Zappa_match Zappa match - from Rybka from Wikipedia]</ref>, organized by Paul J. German and sponsored by Jorge Saggiante <ref>[http://www.acoz.net/zappa/mexico/ Zappa fillets the Fish: Mexico 2007] by [[Anthony Cozzie]]</ref>, who was main organizer of the World Chess Championship <ref>[http://en.chessbase.com/post/mexico-countdown-preparations-and-technical-meeting Mexico countdown: preparations and technical meeting], [[ChessBase|ChessBase News]], September 12, 2007</ref>. [[David Levy]] served as arbiter. Zappa, operated by book author [[Erdogan Günes]] won by 5½–4½ and the prize money of $10,000. A key game was the 180-move [[#game4|fourth game]], where Erdogan, who smelled a weakness, insisted on playing on after a draw offer by the Rybka team. Due to the [[Fifty-move Rule|fifty-move rule]], Rybka gave a pawn to avoid an immediate draw, and later two more pawns to eventually lose the game and match.
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