White to move. White’s Queen is Pinned against the King by the Black Queen and can’t move. But the White Rook and Bishop are still on the loose. The Rook has a nasty plan (see Fig 9, above):
1. R h7 + !
K e8
2. B b5 (See Fig 10)
Black to move. Suddenly, White’s Queen is no longer threatened by the Black Queen. The Black Queen is Pinned against the King by the White Bishop and can’t move. White will win the Queen, thanks to the deadly Pin (see Fig 10, above).