Just a quick point,it may have been mentioned before but the three fold repetition doesn't work when playing against the computer.

oh ok thanks.

PerfectGent wrote: thats because under chess rules you have option to claim the draw or not. it is neither automatic nor mandatory.

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 In that case the program should recognize the three fold repetition and give you a popup asking if you want to claim a draw. 

I played against a computer but not in this site.... the computer automatically end the game when theres a 3 fold repetition made.

Against commercial chess software like Chessmaster, the computer automatically alerts the player that the game is a draw by three-fold repetition. However the computer does not lock and stop the game but allows the player to continue.

i think you're right....