Your move. You are O, pick a square.
X | 2 | 3 ---+---+--- O | X | 6 ---+---+--- 7 | 8 | 9
Moves: X5 O4 X1
New game | Computer goes first | Undo
Play the recursive version ↻
No JavaScript. Every square is a link. Works in curl, lynx, or a browser.