You have problem in won.php at this line
$res=mysql_query("SELECT * FROM users WHERE user_id=".$_SESSION['user']);
You have $_SESSION['user'] as string.. This must be integer OR you must add quotes:
$res=mysql_query("SELECT * FROM users WHERE user_id='".$_SESSION['user']."'");
Or define $_SESSION["user"] as integer by adding (int) after = where you define it.
UPDATE
Problem solved with teamviewer. User got blank variable $wonorlose because he make AJAX POST without parameters. I changet AJAX POST into AJAX GET with parameter wonorlose and now its working. Final code have only author.
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solved Form method get not working [closed]