Step by Step: Test #23
By Mark Donlan
Step by Step: Test is designed to test and improve your chess skills. For best results, set the position up on the board and think for as long as you need without moving the pieces.
How should White respond to 40…Rf3?
Morozevich,A (2762) – Vitiugov,N (2729)
54th Reggio Emilia ITA (5), 31.12.2011
Nimzo-Indian Defense [E39]
1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 0-0 6.a3 Bxc5 7.Nf3 b6 8.e4 Nc6 9.b4 Nd4 10.Qd2 Nxf3+ 11.gxf3 Be7 12.Rg1 Kh8 13.Bb2 a5 14.b5 d6 15.0-0-0 Rg8 16.Kb1 Bb7 17.h4 Qc7 18.h5 h6 19.Na4 e5 20.Qe3 Bd8 21.Bd3 Nd7 22.f4 Bf6 23.fxe5 Bxe5 24.Bxe5 Nxe5 25.Nxb6 Rae8 26.Nd5 Bxd5 27.exd5 Nxd3 28.Qxd3 Re5 29.Rde1 Rxh5 30.Qd4 Qc8 31.Kb2 Kh7 32.Re7 Rf5 33.f4 g5 34.fxg5 Rgxg5 35.Rge1 Rg4 36.Qd3 Kg7 37.Qc3+ Kg6 38.b6 Qc5 39.b7 Rg2+ 40.Ka1
40…Rf3 41.b8Q! 1-0
If 41.Qxf3 Qd4+ and Black checkmates. 41.b8Q leads to mate in sixteen; and if 41…Rxc3 it is mate in four beginning with 42.Qg8+.
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