 The game Donner – Tal, Zurich 1959, was a classic demonstration of the power of Black's queenside pawn advance, backed up by the bishop on g7. After Black's 20 ... Qb4! White was unable to exchange queens, as 21.Qxb4 cxb4 22.Nd1 Nc5 would fork the pawns on a4 and e4. However, the actual game did not last long after Donner's 21.Qf1: Tal set his pawns in motion with 21 ... c4 22.Re2 b5 23.axb5 axb5 24.Kh1, created a passed c-pawn with 24 ... Bxc3! 25.bxc3 Qxc3 26.Rxb5 Qd3 27.Qe1 c3 28.Rb1, and forced Donner's resignation with 28 ... Nc5! when White could neither save his e-pawn nor stop Black's c-pawn from queening. According to Donner, while he spent over two hours on the game, Tal used only fifteen minutes.
