Correct answer: Nb11...d4 2.Qg3# 1.Nf3?? (2.Qd4#) but 1...Kc4! 1.Nb3?? (2.Qd4#) but 1...Kc4! 1.Qf4?? zz 1...d4 2.Qf3#/Qg3# but 1...Kc3! 1.Q