Corrected entry: The whole point of playing tic-tac-toe in the end was so Joshua could learn that the game would always end a tie. But take a close look at the second game he plays in the war room. Two "X"s and two "O"s are played in boxes where all Joshua would have to do is put the next X in the top middle box, and he would've won that game. A human could conceivably miss that, but since it was just established that Joshua was playing himself (of players "zero"), a computer wouldn't have missed such an easy move, especially since the reason Joshua plays anything is "to win the game".
Bishop73
27th May 2011
Correction: That is not right because the next move was done with an "O".