Calculation: three moves deep is lesson 5 of 9 in Real-game tactics 8: Deep combinations, a tactics course suited to players rated around 2000 (strong club players). Combinations of three moves or more. See the whole line, with the opponent's best replies, before you play. It has 7 interactive exercises: 7 calculated lines from real positions. You play every move on a board and get feedback straight away. The lesson is free.
What you practise
Black to move and win. (2 positions)
White to move and win. (5 positions)
Worked examples
Black to move and win. 1...Qxd3 2.Qxd3 cxd3 3.Rxc7 d2. The queen sacrifice on d3 dragged the queen away from its duty. The position is winning.
White to move and win. 1.Rxd7 Bxd7 2.Qd8+ Nf8 3.Bc5 Qxc3 4.Qxf8+. The invasion on the 7th rank decided it. The position is winning.
chessGM