Correct answer: d71. d7! [2. Q:a6+ Kd5 3. Qd6, Bc4#] 1. ... Q:g4 2. d8=N+ B:d8 3. c:d8=N# 1. ... R:g4 2. c8=Q+ N:c8 3. d:c8=Q# 1. ... Kb7 2. Q:a