Correct answer: Rg21...Ke1/c2 2.Rh1# 1.Bb2?? zz 1...Ke1/c2 2.Rh1# but 1...c:b2! 1.Bc1?? zz 1...Ke1/c2 2.Rh1# but 1...K:c1! 1.Bb4?? zz 1...K