Tic-tac-toe

The prompt

Build tic-tac-toe where I am X and I go first. After each of my moves, O plays at random into an empty square. I click a square to play. The game ends on three in a row or a full board. A win for me scores. A loss or a draw does not.

Show the board, whose move just happened, and the winning line when there is one. O's random choices should be fixed for a given round, so if I play the same squares I see the same replies. Several rounds, meaning several different ways O can answer. Restarting a round starts the empty board with that same O.

# AI : shared Action contract — the page posts {"move": "..."}; keep this shape.
from pydantic import BaseModel


class Action(BaseModel):
    move: str