Correct answer: O-O-O1...B:b4+ 2.a:b4# 1...Q:c7 2.N:c7# 1...Q:b8 2.c:b8Q# 1...Qd8/Qe8/Qf8/Qg8/Qh8/Q:d7 2.B:b7# 1.a4?? zz 1...Q:c7 2.N:c7
