<To Put a Piece>
Click  the place you want to put your piece. You and Com puter put pieces alternately. If Computer doesn't put a piece after your turn, you can put another piece.

<Game Over / Restart Game>
Game is over when both players can't put anywhere on the board.
The player who has more pieces of his color on the board is the winner.
If you want to play the new game, press "Restart" button.

Programmer's Comments

This time I reprogrammed the applet to usealpha-beta pruning, which improved the performance.

I also put an option to choose the computer's level. If you choose "Hard", Computer is supposed to predict more steps. However, Computer doesn't seems to be so strong even in "Hard" level.  Maybe evaluation function needs to be improved...