Chess

The dark-square weakness around the black king is the key to how white, next to play, delivers the decisive blow. See if you can work out how?

O’Toole – Haria Hastings 2009

1. Qf4! Black is forced to take the white rook else 2. Rh8+! Kxh8, 3. Qh6+ mating. But after 1…gxh5. 2. Qg5+ still mates.