Correct answer: Nb51...R:f1/Rf5 2.Bb2# 1.Be3?? (2.Bd4#/Nf4#/Nf8#/Ng5#/N:g7#/Nd4#/Nd8#/Nc7#) 1...Bf2/Rf4 2.Nf4#/Nf8#/Ng5#/
