Step by Step: Calculation #29
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. Also, be sure to subscribe to our Daily Chess Puzzle email.
White to move and win
Calculate a win for White
Mecking,Henrique (2575) – Tan,Lian Ann (2365)
Petropolis Interzonal (4), 28.07.1973
English Opening [A29]
1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.g3 Bb4 5.Bg2 0-0 6.0-0 e4 7.Ng5 Bxc3 8.bxc3 Re8 9.d3 exd3 10.exd3 d6 11.Rb1 h6 12.Ne4 Nxe4 13.Bxe4 Ne5 14.f4 Nxc4 15.f5 d5 16.Bg2 Ne3 17.Bxe3 Rxe3 18.f6 g6 19.Qd2 Re6 20.Qxh6 Rxf6 21.Rxf6 Qxf6 22.Bxd5 Bf5 23.Rxb7 Rd8 24.Bc4 Qxc3
25.Bxf7+! Kxf7 26.Rxc7+!! Qxc7
27.Qh7+ Ke6 28.Qxc7 Rxd3 29.Qxa7 Rd1+ 30.Kf2 Rd2+ 31.Kf3 Rd3+ 32.Kf4 Kf6 33.Qa6+ 1-0
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