
Solution

1… Nh2 is a fork against the white queen and rook.
The point is that the black knight is defended through the X-ray effect of the black bishop. Ie. 2. Bxh2 Qxh2#
1… Nh2 is a fork against the white queen and rook.
The point is that the black knight is defended through the X-ray effect of the black bishop. Ie. 2. Bxh2 Qxh2#