Correct answer: Ndb21...Nf4/Bd2/Bg7 2.Qd2# 1...a2 2.Bb2# 1.Nc5?? (2.Nb3#) 1...Bd2 2.Q:d2# but 1...Nd4! 1.Qd3?? (2.Qc2#/Qb1#) 1...N