Step by Step: Calculation #30
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
[FEN “r2r4/2q1b2Q/p1P1k1p1/6B1/6P1/2p5/PPP4P/1K1R4 w – – 0 27”]
Calculate a win for White
[FEN “r2rk3/2q1b2p/p1P3p1/6B1/2B3P1/2p4Q/PPP4P/1K1R4 w – – 0 25”]
Calculate a win for White
[FEN “r3r1k1/2q1bp1p/p1bp1Rp1/6B1/4P1P1/2pB3Q/PPP4P/1K1R4 w – – 0 21”]
Berg,Emanuel (2496) – Buhr,Carl Christian (2394)
Bundesliga Germany (4.5), 25.11.2001
Sicilian Scheveningen [B82]
1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be3 e6 7.f4 Be7 8.Qf3 a6 9.Bd3 Qc7 10.0-0-0 0-0 11.Kb1 Bd7 12.g4 Nxd4 13.Bxd4 Bc6 14.Qh3 e5 15.Be3 exf4 16.Bxf4 g6 17.Rhf1 b5 18.Bh6 Rfe8 19.Bg5 b4 20.Rxf6 bxc3
Diagram Three
21.Rxf7!! Kxf7 22.Bc4+! d5 23.exd5 Red8 [23…Bxg5 24.Qxh7+ and 25.Qxc7] 24.dxc6+ Ke8
Diagram Two
25.Bf7+!! Kxf7 26.Qxh7+ Ke6 [Or 26…Ke8 27.Qxg6+ Kf8 28.Bh6#]
Diagram One
27.Qxg6+ 1-0 [27…Ke5 (27…Bf6 28.Qxf6#) 28.Qf5#]
Download Step By Step: Calculation #30 in PDF format.
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