Correct answer: Ng51...Kd6/g:f6/e:f6 2.Bg3# 1.Rf3?? (2.Bg3#) but 1...Kd6! 1.Rf2?? (2.Bg3#) but 1...Kd6! 1.Rf1?? (2.Bg3#) but 1...Kd6! 1.Rf7?