1. Bd4+		Kh7 or (A)
2. Bf5+		Kg8
3. Be6+		Kh7
4. Nf8+		Rxf8
5. exf8=N#
1. ...		Kg8 (A)
2. Be6+		Kh7
3. Nf8+		Rxf8
4. exf8=N#