Game Rules:

The game "Tic-Tac-Toe" is played by two players on a 3x3 rectangle board with square tiling. 
Player one plays with Discs. Player two plays with Crosses.
Players take turns moving.
Rules: 
     Add one of your pieces to the set of empty cells.
Aim: 
     If a player places 3 of their pieces in an adjacent direction line, the moving player wins.

Game Heuristics:

All Players:

corner proximity
Sum of owned pieces, weighted by proximity to nearest corner.
You should try to move your piece(s) towards the corners of the board (very high importance)

Board Setup:

Game Endings:

Game won by Player 1.

Game won by Player 2.

Moves:

Player: 1

Piece: Disc

Move: Add one of your pieces to the set of empty cells

Player: 2

Piece: Cross

Move: Add one of your pieces to the set of empty cells