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Hi! Wonderful site, I just found it... it's very fast too!
I see you've got Pente, so the board is there already - how about implementing Go as a game?
If you're doing Go, make sure you get the only correct scoring algorithm: none at all. Just let the players mark the dead stones until they agree on the score, then simply count enclosed spaces.
IYT has an automatic algoritms to determine dead stones, and it invariably fails, which is the mean reason I let my IYT membership expire.