In this game from the 1978 World Championship between Victor Korchnoi and Anatoly Karpov, White's pawn is the wrong rook pawn. White went on to the black b-pawn on move 107, but was unable to force the black king far enough away from the a8-square to get to a winning position. The game ended in an intentional stalemate on move 124 (see Stalemate#Korchnoi versus Karpov for the final position). Some commentators thought that Korchnoi might have missed a win in this endgame, but Karpov defended well and White never had a theoretically won position. (However, Korchnoi did miss a win earlier in the game.) Black's pawn on b5 is actually a liability. If the black king is forced into a position where he cannot move, Black would have to move the pawn and White would win the game. As of 2008, this is the longest game of a world championship , . (Karpov retained his title by a score of six wins to five.)