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Four rooks are facing each other on the d-file. White gets the advantage if he finds the right way to deal with Black's knight on d4. How?
A) 19.Ne7+ Kd7 20.Nxg6 fxg6 21.c3
B) 19.c3 (Nc6)
C) 19.b4
Do you like these lessons? There are plenty more by tactic expert Oliver Reeh in ChessBase Magazine, where you will also find openings articles and surveys, endgames, and of course annotations by the world's top grandmasters.