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In fact, 15.d6! is the first step to activate White's queen d1.
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.
Strike like the world champions
88 times, IM Oliver Reeh leads you step by step through the most brillant game conclusions of the world champions - in interactive Fritztrainer format, enabling you to enter the winning moves yourself.