game and drew the second one. Then they played two games at the classical "pawn and move" handicap (f7 removed). The first game ended in an early draw by perpetual check, while the second was won by Milov. Finally they played four games at odds of the exchange (Rybka removed a1 rook, Milov b8 knight); here Rybka drew three times and lost once. The final score was 4.5–3.5 for Milov. Zappa match In September 2007, Zappa defeated Rybka in a match, –. Two famous games were played in this match. The first was the 180-move fourth game, which was approaching a draw under the 50-move rule. However, due to an incorrect evaluation by the Rybka engine, at move 109 it moved a pawn to avoid a draw (even though Zappa could, and did, immediately take the pawn), thus resetting the counter for that rule. The loss of the pawn eventually allowed Zappa to whittle away Rybka's defenses and win the game. Then in game 9, Rybka was 3 pawns up with a totally won position, but played a horrific blunder on move 71, "the worst blunder in modern computer chess", as it lacked sufficient knowledge to see a draw would ensue by opposite-color bishops. Zappa had this knowledge, took advantage, and drew the game. Anthony Cozzie thanked his operator Erdogan Gunes for having the wherewithal to stay until the end in these two games, rather than agree to a draw in game 4 or resign in game 9. The match came about after Vasik Rajlich made a $100,000 publicity challenge to the FIDE champion Fritz or Junior, even offering odds of a game in a 24-game match (13 points). But negotiations between Rybka and Junior broke down due to disputes over on-site machines. The match was changed to 10 games against Zappa, with $10,000 the amount eventually paid to the winner. Versions Version 3 Rybka 3 was released on August 6, 2008. While previous versions of Rybka were released exclusively by Convekta, Rybka 3 was released by both Chessbase and Convekta. Although still a UCI engine, Rybka 3 has extra features when run under the ChessBase and Convekta user interfaces. In an interview with Frank Quisinsky, Vasik Rajlich revealed plans for a future GUI that would "properly display chess knowledge to the user" most likely in the form of graphical evaluation of the pieces on the board. The GUI, named