This
problem, a famous Benko endgame composition,
sees White down an Exchange but (according to
Benko) able to force a win. Do you see how White
claims victory?
WHITE TO MOVE AND WIN
1.Bc4+! (1.b7? Kxb7! 2.Bd5+ Kb8 3.Be4 a5
4.Bxa8 a4!, =) 1…Ka5 2.b7 Rf8 (2…Rb8?
3.Bb5) 3.Bd3 Rg8 4.b4+ Ka4 5.Bc2+ Ka3 6.b5 Rf8
7.Bd1 Rg8 8.Bg4 Rb8 9.Kc6 Kb4 10.Be2 Re8 11.Kd7
Rf8 12.Kc7 Rf7+ 13.Kb8, 1-0.
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