[Event "Diagram 13"] [Site "?"] [Round "0"] [White "Alekhine"] [Black "Johner"] [Result "1-0"] [ECO "C70"] [Opening "Spanish: 4.Ba4"] {The Bishop and Open Diagonals: In order to obtain its full working force, a Bishop must be provided with open diagonals; here its long-range power can be put to good effect. The following game shows how the opening of an attacking diagonal can lead to an immediate decision.} 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.O-O Nf6 6.c3 Bd7 7.d4 Be7 8.d5 Nb8 9.Bc2 Bg4 10.c4 Nbd7 11.h3 Bh5 12.Nc3 O-O 13.g4 Bg6 14.Qe2 Ne8 15.Bd2 h6 16.Kg2 Bh7 17.Rh1 g5 18.h4 f6 19.Nd1 Rf7 20.Ne3 Nf8 21.Nf5 Bxf5 22.gxf5 Rh7 23.Rag1 Ng7 24.Kf1 Qe8 25.Nh2 Nh5 26.Ng4 Nf4 27.Qf3 Kg7 28.hxg5 hxg5 29.Rxh7+ Nxh7 30.Rh1 Kh8 31.Rh6 Qf7 32.Bd1 Rg8 33.Qb3 b6 34.Qa4 Bf8 35.Qxa6 Bxh6 36.Nxh6 Qg7 37.Nxg8 Kxg8 38.Qc8+ Nf8 39.Bxf4 exf4 40.Qe8 g4 41.Qh5 f3 42.Ba4 Nh7 43.Bc2 Nf8 44.e5!! dxe5 45.d6! c5 46.Be4 Qd7 47.Qh6 {The position is hopeless as there is no defense after 47...Kf2 48.Bd5#} {#r} 1-0