Correct answer: Nb21...Re3 2.d:e3# 1.Nb2! (2.Nf3#/Nf7#/Ng4#/Ng6#/Ned3#/Nd7#/Nec4#/Nc6#) 1...Ng4 2.Nf3#/N:g4#/Nc6# 1...Nd3 2.
