im not very clear about this but i know rule is not allow somebody to give up his stones like tom

@vincent @jheps @statmatt

Read something there:
senseis.xmp.net/?rules
In computer games or online games there are often rules with "Area Scoring" used.

I believe you are thinking of Japanese scoring, on PlayStrategy we use Chinese scoring, which only counts stones on the board + area you control. You can read more about the rules at playstrategy.org/variant/go19x19