Correct answer: Nb:d31...Ndc4 2.Qc3# 1.N:d5?? (2.Qb4#) 1...Ndc4 2.Qc3# 1...Nbc4 2.Q:a1# but 1...e:d5! 1.Nb:d3! (2.Qb4#) 1...Ndc4 2.Qc3#
