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 ocassion 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
[FEN “4Q1nr/2p2ppp/3bpk2/1B4q1/6Pn/2N5/1P3P1P/3R2K1 w – – 0 21”]
Calculate a win for White
![[FEN "3q1knr/1Qp2ppp/3bp3/1B6/6Pn/2N5/1P3P1P/2BR2K1 w - - 0 18"]](https://chesscafe.com/wp-content/uploads/2014/10/sbscalc25b.gif)
[FEN “3q1knr/1Qp2ppp/3bp3/1B6/6Pn/2N5/1P3P1P/2BR2K1 w – – 0 18”]
Krasenkow,Michal (2505) – Westerinen,Heikki MJ (2435)
GMA Baleares op Palma de Mallorca (1), 1989
Queen’s Gambit Accepted [D21]
1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e4 b5 5.a4 Bb7 6.axb5 axb5 7.Rxa8 Bxa8 8.Nc3 e6 9.Nxb5 Bxe4 10.Bxc4 Bb4+ 11.Nc3 Nc6 12.0-0 Bxf3 13.Qxf3 Nxd4 14.Qb7 Bd6 15.Rd1 Nf5 16.g4 Nh4 17.Bb5+ Kf8 (Diagram Two) 18.Bg5 f6 [18…Qxg5 19.Qc8+ Ke7 20.Qe8+ Kf6 (Diagram One) 21.Ne4+] 19.Bxh4 h5 20.Bg3 e5 21.gxh5 Rxh5 22.Ne4 g6 23.Nxd6 cxd6 24.Ra1 1-0
Download Step By Step: Calculation #25 in PDF format.
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