Summer chess school lesson 17. As with the last puzzle, White is a pawn up, but Black is about to eat the b4 pawn and have a passed pawn of his own. The white king and rook are actively placed, and the black rook might try a rear-guard action. However, White has a surprise in store! The position is from Dolmatov-Sosonko, Cannes, 1994.
1.Rf6 [The natural looking 1.Rb6 leads to solvable problems for White in winning after 1...Rxb4 2.f5 gxf5 3.gxf5 Rd4 4.Rb7+ Rd7 5.Rxb5 Ra7 6.Rb6 Rc7 7.f6+ Kd8 8.e6 Rc5+ 9.Kh6 fxe6 10.f7 Ke7 11.Kg6 Rc8 12.Kg7 e5 13.Rf6 Rf8 14.Rf5 Rxf7+ 15.Rxf7+ Ke6 16.Kg6 e4 17.Rf5 e3 18.Rf3 e2 19.Re3+] 1...Rxb4 2.Kh6!! [This king move, however, ends the game more quickly.] 2...Ke8 [2...Re4 3.Kg7 b4 4.g5! b3 5.Rxf7+ Ke6 6.Rf6+ Ke7 7.Rb6 Rxf4 8.Rxb3 Re4 9.Kxg6 Rxe5 10.Rb7+ Kf8 11.Rb8+ Ke7 12.Kh6 Kd7 (12...Kf7 13.g6+) 13.g6 Re6 14.Kh7 Re1 15.g7 Rh1+ 16.Kg6 Rg1+ 17.Kf5! The distance of the white pawn from the black king makes the pawn invulnerable because of Rb7+. 17...Rf1+ 18.Ke4 and the checks soon run out as the king runs right up to the rook and the pawn queens.]3.Kg7 g5 4.f5 Rxg4 5.Rxf7 Rf4 6.f6 g4 7.e6 Kd8 8.Ra7 g3 9.e7+ Ke8 10.Ra8+ Kd7 11.e8Q+ 1–0