Editing 832: Tic-Tac-Toe
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| titletext = The only winning move is to play, perfectly, waiting for your opponent to make a mistake. | | titletext = The only winning move is to play, perfectly, waiting for your opponent to make a mistake. | ||
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β | |||
==Explanation== | ==Explanation== | ||
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1|2|3 | 1|2|3 | ||
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+ | Pixel values are taken from http://xkcd.com/832_large/. | ||
Each map shows every possible combination of moves which will result in that side winning or tying. It assumes that X moves first, and its optimal move is X7. Any corner would do, so X1, X3 and X9 are also optimal moves. The map for X has a big red X7 (650×650 pixels), and the 8 remaining grids have a smaller (210×210) black X7. | Each map shows every possible combination of moves which will result in that side winning or tying. It assumes that X moves first, and its optimal move is X7. Any corner would do, so X1, X3 and X9 are also optimal moves. The map for X has a big red X7 (650×650 pixels), and the 8 remaining grids have a smaller (210×210) black X7. | ||
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9) In Map for O, there are four further "strategy" mistakes, when the O player could have won the game but doesn't. These can be found on: | 9) In Map for O, there are four further "strategy" mistakes, when the O player could have won the game but doesn't. These can be found on: | ||
β | * X7, O5, X8, O9, X1, O4: the small squares for X6 and X2 are identical, but only the one for X6 is correct. In case of either X2 or X3, O has the winning move O6. | + | * X7, O5, X8, O9, X1, O4: the small squares for X6 and X2 are identical, but only the one for X6 is correct. In case of either X2 or X3, O has the the winning move O6. |
The squares for X2 and X3 should be: | The squares for X2 and X3 should be: | ||
X|X|O | X|X|O |