[Event "K+R+2P vs K+R+3P"] [Site "www.masterchessopen.com"] [Date "1978.01.01"] [Round "0"] [White "Diagram #47: G. Hamann"] [Black "Mortensen"] [Result "0-1"] [EventType "team"] [EventCountry "GER"] [FEN "8/6p1/7p/3k4/2r5/4K3/2p3PP/2R5 b - - 0 1"] { A rook actively posted behind its pawn creates additional problems for the opponent. Defending against such an augmented passed pawn can lead to new weaknesses in other areas. Black has a positional advantage (more active pieces), even though his extra pawn will be lost. Black uses the right to move, and the activity of his pieces, to surrender the pawn in a way that gives him a different, decisive advantage. } 1...Rc3+! { Nothing is gained by 1...g5 2. Kd3, and after 3.Rxc2 Black's king will get no access to White's pawns. } (1...g5 2.Kd3 -- 3.Rxc2) 2.Kd2 Kd4 3.Rxc2 Rxc2+ 4.Kxc2 Ke3 { The rest is clear - White's pawns are easy prey: } 5.g3 g5 6.Kc3 g4 7.Kc4 Kf3 8.Kd4 Kg2 {#R} 0-1