N°6 Gatti Daniele Guglielmo (Italy)

Section D2 – h#3
3 solutions
1.O-O g3 2.Kh7 Qf3 3.Kh6 Qxh5#
Castling on first Black move
1.e2 Kf2 2.O-O-O Qa1 3.Bb8 Qa6#
Castling in second Black move
1.Qe5 Nxd5 2.Qxh2+ Qxh2 3.O-O-O Qxc7#
Castling on third Black move