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Step 1 / 2
Black's queen on d8 is the only guard of both the knight on d7 and the back rank. Take the knight: after Rxd7 Qxd7, the queen has abandoned the eighth rank, and Rb8+ forces mate.
Step 1 / 2
Black's queen on d8 is the only guard of both the knight on d7 and the back rank. Take the knight: after Rxd7 Qxd7, the queen has abandoned the eighth rank, and Rb8+ forces mate.