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Answer keyBack-rank mates11. Qf7+ Kh8 2. Qf8+ Rxf8 3. Rxf8#White to move21... Qf1+ 2. Rxf1 Rxf1#Black to move31. Qc7+ Ka8 2. Qc8+ Rxc8 3. Rxc8#White to move41... Qe2+ 2. Kg1 Qe1+ 3. Nxe1 Rxe1#Black to move51. Qf7+ Kh8 2. Qf8+ Rxf8 3. Rxf8#White to move61... Qf2+ 2. Kh1 Qf1+ 3. Rxf1 Rxf1#Black to moveSolve these on screen at chessboost.orgPage 2