Correct answer: Re41...Ne4 2.f:e4# 1...e6/e5 2.N:f6# 1...B:b4/Bc7 2.Nc7# 1...c4 2.Rd4# 1.B:c5?? (2.Rd4#) 1...e5 2.N:f6# 1...Bc7 2.N:c7# 1...N