Paint the grid one player at a time, painting 9 squares around your chosen point, if they're empty.
The player that paints the last square is the winner.

You can Play Obstruction in the Shoebox, under the One On One games section.

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What I Didn't Do

The game seems to work well enough, but the AI is, as usual, not 100% up to scratch.
There's been a few occasions where I've thought "Oh, silly AL!!", but ..
For the most part, he manages well enough.