1...Bc3 (x) 2.Qxe3# (X)

1.Kg5! [2.Sf6#]

1...S6xd5 2.Qc4#

1...Bxd5 2.Bh7#

1...S4xd5 2.Qb1#

1...Kxd5 2.Kf4#

1...Bc3 (x) 2.Sxc3# (Y)

Defences on same square

Flight giving key

Sacrifice key

Changed mate