1.Bd3? (2.Rd5#),1...Qxd4! (b),

1.gxf4+? gxf4 2.Se~#,1...Kxd4! (c).

1.Bg2! (2.Rd5#),

1...cxd4 (a) 2.Sac4#,

1...Qxd4 (b) 2.Sec4# ,

1...Kxd4 (c) 2.Qc3#.

(1...Qxe3+ 2.Qxe3#)

Same square refutations become defenses in solution.