Correct answer: Nc21...c2 2.O-O# 1.B:c3?? (2.O-O#/Bd2#/B:b2#/Q:b2#) but 1...d:c3! 1.Bd6?? (2.Bf4#) but 1...c2! 1.Be7?? (2.Bg5#) but 1...c2! 1.Bf8?? (2.Bh6
