Correct answer: a41...b5 2.Na5# 1...Bg3/Bd2/Bc7/Bb8 2.Nfd2#/Nbd2# 1...Be5 2.Nfd2# 1...Bd6 2.Nbd2# 1.Nfd4?? (2.Bb5#) but 1...Bd6! 1.