Every disc you flank changes sides for good — until it doesn't.
pearl (you) — your move.
How to play: You're pearl. Click a marked square to place a disc — any straight line (across, up-down, or diagonal) of the AI's discs trapped between your new disc and another pearl disc flips to your side. A move must flip at least one disc to be legal; if you have no legal move, your turn passes automatically. The game ends when neither side can move, and whoever holds more discs wins.