It's fairly easy to play against my applet. By default, you are black, and you have the first move. By moving the cursor over the board, you see a purple disc appear on each square where you can make a legal move. By clicking on that square, you make the move, the applet will make its countermove, and so on. If you're not satisfied with your move, simply press .

My Reversi-Othello applet offers the following additional functions:

• Select playing level and maximal search time, by clicking on . The applet offers the following levels:

  Playing level	Search depth	Default max. search time
  Novice	1	30 seconds
  Amateur	2	1 minute
  Specialist	4	2 minutes
  Expert	6	5 minutes
  Master	8	30 minutes

The maximal search time of the applet is not guaranteed: when the applet concludes it's in a losing position, it will try to keep on searching until it (hopefully) finds a move that will not result in a loss. Also, when the maximal search time is set to a lower value than the default value, the applet will probably play weaker. Therefore, it is advised not to change the default maximal search time.

• Select variational play: you can specify whether you want the applet to play a game opening at random, or that it should always choose the first 'opening continuation' that it finds instead. If you choose yes, the computer will show more variation in its game playing, and will not always choose the same move sequence.
• Move take back: you can take back your moves, by clicking . This will take you back to your previous move.
• Switch to the opposite color: you can switch colors with the applet by clicking . By repeatingly clicking this symbol, you can make the applet play against itself!!
• Sound on/off: you can put the sound on or off by clicking .
• New game: you can start a new game by clicking .
• Analysis mode: you can view some performance figures, observe the evaluations of the applet, and obtain some more interesting information on the game in progress by clicking . 
• Switch board: when starting a new game, you can flip the white and black discs by clicking . This is a handy feature for playing against other applets that use such an opening.
• Win-lose endgame: when starting a new game, you can instruct the applet to perform a win-lose endgame search, instead of a perfect endgame search. In a win-lose endgame search, the applet is satisfied when a winning move has been found. It won't try to find the best move that will beat its opponent with maximal disc difference. You can select win-lose endgame search by clicking in the opening position.