Correct answer: Nb61.d8Q?? (2.Qdb8#/Qf6#/Qc7#) 1...f4/b6 2.Qf6# 1...Ne8 2.Qe7# 1...Qh4/Bg5 2.Qdb8#/Qc7# 1...B:d4 2.Qab8# but 1...N
