Correct answer: h8N1...d5 2.Ng6# 1.a8Q?? (2.Qa1#) 1...d5 2.Ng6# but 1...Ba2! 1.b8Q?? (2.Qb2#) 1...d5 2.c8Q#/c8R#/c8B#/c8N#/Ng6# but 1...B