Correct answer: Rg51...K:f3 2.O-O# 1.Be4?? (2.Rh4#/Rg4#) 1...g5 2.Rg4# but 1...d:e4! 1.h6?? zz 1...K:f3 2.O-O# but 1...g:h6! 1.Rf2?? zz 1...Kg5 2.B:e3#
