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In September 2007, Zappa defeated Rybka in a match, 5 + 1 ⁄ 2 – 4 + 1 ⁄ 2. Two famous games were played in this match. The first was the 180-move fourth game, [36] 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 ...