Correct answer: Ne31...Bc3 2.f3# 1.Rb2+?? 1...Bc3 2.f3#/Qe3#/N:a1# but 1...b4! 1.Rc4+?? 1...b4 2.Qe3# 1...Bc3 2.f3# but 1...Qc3! 1.f3+?? 1...K