Correct answer: Bc51...a4 2.Kb4# 1...e4 2.K:d4# 1...Ng4/Nh1/Nh3/Ne4/Nd1/Nd3 2.Kd3# 1...f5 2.Qe7# 1...d3 2.Kc3# 1.Ba3?? zz 1...f5 2.Qe7#