Step by Step: Calculation #33
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.
Evaluate the position with Black to move. Is Bxc3 safe?
[FEN “2q4k/p5bp/6p1/5p2/5P1P/1BP2QP1/Pr6/3R2K1 b – – 0 37”]
Fischer,Robert James – Bennett,JS
USA-ch Juniors USA, 1957
Sicilian Richter-Rauzer [B60]
1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 g6 7.Bxf6 exf6 8.Bc4 Bg7 9.0-0 0-0 10.Ndb5 f5 11.exf5 Bxf5 12.Nxd6 Ne5 13.Bb3 Qd7 14.Nxf5 Qxf5 15.Nd5 Nc6 16.Ne3 Qc5 17.c3 Rad8 18.Qf3 Rd7 19.Rad1 Rd6 20.Rxd6 Qxd6 21.Rd1 Qc5 22.h3 b5 23.Rd5 Qb6 24.Rd6 Ne5 25.Qd5 Qc7 26.f4 Nc4 27.Nxc4 bxc4 28.Bxc4 Kh8 29.Bb3 f5 30.g3 Re8 31.Qc6 Qb8 32.Rd7 Re1+ 33.Kf2 Qe8 34.Qf3 Rb1 35.Rd1 Rxb2+ 36.Kg1 Qc8 37.h4
37…Bxc3? 38.Rd8+! Qxd8 39.Qxc3+ Qf6 40.Qxf6# 1-0
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