Correct answer: O-O-O1...f:e2 2.R:c3# 1...c2 2.R:f3# 1.Rg3?? zz 1...c2 2.R:f3# 1...f:e2 2.R:c3# but 1...f:g3! 1.e4?? zz 1...c2 2.R:f3# but 1...f:e3 e.p.! 1.Rb1?? zz
