Your move. You are X, pick a square.
O | 2 | 3 ---+---+--- 4 | X | 6 ---+---+--- 7 | 8 | 9
Moves: X5 O1
New game | Computer goes first | Undo
Play the recursive version ↻
No JavaScript. Every square is a link. Works in curl, lynx, or a browser.