Unbeatable Tic-Tac-Toe

New Game
Make Your Move
Select Select Select
Select O Select
X O X

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Warning: DOMDocument::load(): Opening and ending tag mismatch: game line 22647 and gam in /usr/local/www/apache24/data/tictactoe/games.xml, line: 22650 in /usr/local/www/apache24/data/tictactoe/index.php on line 36

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Fatal error: Uncaught Error: Call to a member function getElementsByTagName() on null in /usr/local/www/apache24/data/tictactoe/index.php:38 Stack trace: #0 /usr/local/www/apache24/data/tictactoe/index.php(113): update_element('t3017', 'moves', '____O_XOX') #1 /usr/local/www/apache24/data/tictactoe/index.php(334): generate('____O_XOX', 't3017') #2 {main} thrown in /usr/local/www/apache24/data/tictactoe/index.php on line 38