Correct answer: Re21...Ng5/Nf4 2.Q:g1# 1...Nf2 2.Qh8# 1...b6 2.Qa8# 1.Nc3?? (2.Ra2#) but 1...b:c3! 1.Nc7?? zz 1...Ng5/Nf4 2.Q:g1# 1...N