initially a draw, but Karpov made a bad move which resulted in a lost position. Topalov later made a bad move, making the position a draw, but Karpov made another bad move, resulting in a lost position again. Wang versus Anand This position from a blindfold game between Wang Yue and Viswanathan Anand leads to an example with a forced win even though the pawn is past the Troitsky line. The game continued 61... Kc5, blocking the pawn with the wrong piece. Black should have played 61...Ne4 62. c4 Nc5!, blocking the pawn on the Troitsky line with a knight, with a forced win. The game continued: 62. c4 Ne4 63. Ka4 Nd4 64. Ka5. Black still has a theoretical forced win in this position, even after letting the pawn advance past the Troitsky line: 64... Nc6+ 65. Ka6 Kd6!! 66. c5+ Kc7 and Black has a forced checkmate in 58 more moves. However, the actual game was drawn. More pawns Two knights can win in some cases when the defender has more than one pawn. First the knights should blockade the pawns and then capture all except one. The knights cannot set up an effective blockade against four connected pawns, so the position generally results in a draw. Five or more pawns usually win against two knights. Example from game In this 1991 game between Paul Motwani and Ilya Gurevich, Black has blockaded the white pawns. In ten moves, Black won the pawn on d4. There were some inaccuracies on both sides, but White resigned on move 99. Position of mutual zugzwang There are positions of mutual zugzwang in the endgame with two knights versus one pawn. In this position, White to move draws but Black to move loses. With Black to move: 1... Kh7 2. Ne4 d2 3. Nf6+ Kh8 4. Ne7 (or 4.Nh4) d1=Q 5. Ng6# With White to move, Black draws with correct play. White cannot put Black in zugzwang: 1. Kf6 Kh7 2. Kf7 Kh8 3. Kg6 Kg8 4. Ng7 Kf8 5. Kf6 Kg8 6. Ne6 Kh7! (but not 6...Kh8? because White wins after 7.Kg6!, which puts Black to move) 7. Kg5 Kg8 8. Kg6 Kh8 and White has no way to force a win. Checkmate in problems The possible checkmate on the edge of the board is the basis of some composed chess problems, as well as variations of the checkmate with two knights