Correct answer: Rg11...Bg5 2.Ng4# 1...Nf5 2.Ne4# 1...Ng6/Ng8/Nd5/Nc6/Nc8 2.R:g6# 1...g6 2.Rf7# 1...g5 2.Ng4#/Rf7# 1.Rh:g7?? (2.Rf7#)