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

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

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....