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Is it a good idea for Black to trade his d-pawn against White's c-pawn in the diagram position - i.e. by playing 24...Qf7 25.Rxd6 Bxc4?
A) Yes, the c-file matters more - Black wins
B) No, the d-file matters more - White wins
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.