1.a4 Kb3 2.a5 Kc3 [2...Kc4 after this moves, white uses the skewer to win: 3.a6 Kd3 4.a7 f2 5.a8Q f1Q 6.Qa6+ wins] 3.Kg1! [3.Kg3? Kd4 4.a6 Ke3 5.a7 f2 6.Kg2 Ke2= ] 3...Kd4 4.a6 Ke3 5.Kf1! and the white pawn queens. 1-0