occurred. Advantageous with positional considerations As stated above, in endgames with opposite-colored bishops, positional factors may be more important than material differences. John Nunn makes two points: usually the number of passed pawns is more important than the total number of pawns small changes in the pawn structure may have a large effect. Against weak pawns In some cases with more pawns on the board, if one side has weak pawns then it is actually advantageous to the other side to have the bishops on opposite colors. In the 1925 game of Efim Bogoljubov versus Max Blümich, White wins because of the bishops being on opposite colors making Black weak on the black squares, the weakness of Black's isolated pawns on the , and the weak doubled pawns on the . The game continued: 29. Kd2 Ke7 30. Kc3 f6 31. Kd4 Be6 32. Kc5 Kd7 33. Kb6 g5 34. Kxa6 Kc7 35. Bb6+ Kc8 36. Bc5 Kc7 37. Bf8 f5 38. Bxg7 f4 39. Bf6 f3 40. gxf3 exf3 41. Bxg5 Bxh3 42. Bf4+ Positional advantages Although endgames with opposite-colored bishops tend to be drawish, even with a material advantage, in some cases positional advantages can be enough to win with the same material on both sides. In this position from a 1956 game between Reinhart Fuchs and Ratmir Kholmov, Black's positional advantages enabled him to win. In this 1976 game between Bojan Kurajica and Anatoly Karpov, the material is even but Black has pinned down White's pawns and is preparing to break through. Black needs to create another weakness or passed pawn to win. White resigned after move 57. As a defensive resource Occasionally opposite-colored bishops endings offer a defender better prospects for a draw than same-colored bishops endings. The weaker side can set up a color-blockade, so the side with the extra material or exchange cannot attack. Liem vs. Svidler Smyslov vs. Vaganian Additional pieces If both sides have an additional matching piece, the situation is much more complex and cannot be easily codified. Generally, the presence of the additional pieces gives the stronger side more winning chances. Glenn Flear calls these "NQE"s ("Not Quite Endgames"). The initiative is important in these types of endgames. Knight With each side having a knight in addition to the bishops, the main idea is for the stronger side to create two passed pawns. If this can be done then the