Anti-Grid

From BoardGameGeek:

Anti-Grid is an abstract strategy game for two players, each trying to eliminate the other's pieces through capture. The unique thing about the board is that each player plays on his/her own grid - they never follow the same paths to victory or defeat. Capture is made by flanking, or trapping an opponent's piece between two of your own, and players may set up “barricades” to impede their opponent's moves (momentarily, anyway). There are two boards included with a larger and a smaller grid, allowing shorter or longer, more challenging games.