Gosix

Gosix is an abstract strategy game played on a 7 hexagons board. You're trying to control 4 of the 7 hexagons. The trick is: whenever you get control over a hexagon, you lose some of the pawns that made you win.

Players take turns placing a pawn on the board. You must discover how to win while losing as few pawns as possible, or "help" your opponent to win and have him lose as many pawns as possible.