King of the Hill
The game follows the usual rules of chess, with one more way to win.
Winning
You win if your king legally moves onto one of the four central squares: d4, e4, d5 or e5. The game ends at once. Checkmate and stalemate work as usual.
Draws and time
There is no draw for insufficient material: even a lone king can walk to the centre. A player who runs out of time loses.