Step by Step: Calculation #28
By Mark Donlan
Step by Step: Calculation is designed to improve your visualization and calculation skills. The premise is simple: find the winning move in the first diagram and then calculate the win from the second diagram and determine how it relates to the first. On occasion follow-up questions will be asked relating to various sidelines. For best results, set the position up on the board and think for as long as you need without moving the pieces.
White to move and win
Calculate a win for White
Peng,Zhaoqin (2433) – Hamelink,Desiree (2187)
NED-ch (Women) Leeuwarden (4), 28.06.2003
Slav Defense [D18]
1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.Nf3 dxc4 5.a4 Bf5 6.Nh4 e6 7.Nxf5 exf5 8.e3 Bb4 9.Bxc4 0–0 10.0–0 Nbd7 11.Bd2 g6 12.Qb3 a5 13.Rad1 Nb6 14.Bd3 Rc8 15.Bc1 Qe7 16.Na2 Nfd5 17.Bb1 Rfe8 18.h3 c5 19.dxc5 Qxc5 20.Bd3 Re5 21.Bb5 Qc2 22.Qxc2 Rxc2 23.Nxb4 Nxb4 24.Rd8+ Kg7 25.b3 N6d5 26.Ba3 Re7 27.Rd1 Nc3 28.R1d2 Rxd2 29.Rxd2 Nxb5 30.axb5 Rc7 31.Bb2+ Kh6 32.Bf6 Rc5 33.Rd4 g5 34.g4 Rd5 35.Rc4 Kg6 36.Bd4 fxg4 37.hxg4 Rxb5 38.Rc8 Nd5
39.Rg8+ Kh6 40.Bg7+ Kg6 41.Be5+ Kh6
42.Bd6! 1-0 Mate is unstoppable.
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