Unbeatable Tic-Tac-Toe

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

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Warning: DOMDocument::load(): Opening and ending tag mismatch: moves line 10616 and unparsable in /usr/local/www/apache24/data/tictactoe/games.xml, line: 10616 in /usr/local/www/apache24/data/tictactoe/index.php on line 36

Warning: DOMDocument::load(): Premature end of data in tag game line 10615 in /usr/local/www/apache24/data/tictactoe/games.xml, line: 10616 in /usr/local/www/apache24/data/tictactoe/index.php on line 36

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('t8617', 'moves', 'OX_XO_XO_') #1 /usr/local/www/apache24/data/tictactoe/index.php(334): generate('OX_XO_XO_', 't8617') #2 {main} thrown in /usr/local/www/apache24/data/tictactoe/index.php on line 38