Correct answer: c8R1...Rb6+ 2.a:b6# 1...Rb8 2.c:b8N# 1...R:c7 2.N:c7# 1.N:b7?? (2.N:c5#) but 1...K:b7! 1.c8N?? zz 1...Rb6+ 2.a:b6# 1...Rb8/R
