Excellent mod.... i was looking for a good chess game for vBulletin or ibproarcade but only with negative results.
This works well in my forum, is vBulletin 3.7.2 PL1
I will rewrite the code to improve the game a little because it is still incomplete. The mod can't check if the move is legal. I will work in this.
You can view the mod working in vB 3.7.2 here
http://megaunder.com.ar/showthread.php?t=2487
PS: Sorry for my bad english :S