Correct answer: Rc21...K:d3 2.Rd1# 1...e:d3 2.Ra4# 1.b4?? zz 1...K:d3 2.Rd1# but 1...e:d3! 1.Ra2?? zz 1...e:d3 2.Ra4# but 1...K:d3! 1.Ra3?? zz 1...e:d3