1.Kg2-f2 ? but 1...f5-f4 !

1.Qg7-f6! threat: 2.Qf6-e7+ Ke4-f4 3.Rc3*c4 #

2...Ke4-d4 3.Qe7-e3#

1...Ke4-f4 2.Qf6-d4+ Kf4-g5 3.Rc3-g3#

1...f5-f4 2.Rc3-f3! threat: 3.Qf6*f4#

1...d7-d5 2.Sb6-d7! threat: 3.Qf6-e5#

2...Ke4-f4 3.Qf6-h4#