Correct answer: Kd11...N:h3 2.O-O-O# 1...N:e2 2.K:e2# 1.e:f3?? zz 1...N:h3 2.Ke2#/O-O-O# 1...N:f3+/Ne2 2.Ke2# but 1...e2! 1.Rb1?? zz 1...N:e2 2.K