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

strange. i remember a book said Chinese and Japanese counting result is about same

im asking for ai. it said im right.

ai said:

Under Chinese rules (the "territory counting" method), captured stones are not scored directly, but they affect the final territory calculation in two main steps:

1. Stones are not territory — they become negative for the opponent

At the end of the game, all captured stones are placed back into the opponent's empty territory. For example, if you lost 10 stones during the game, those 10 stones must be placed inside your opponent's enclosed empty areas. This directly reduces the opponent's territory — if they had 50 points of empty space, after filling with your 10 stones, they only have 40 points left.

2. Dead stones on the board are also filled back

Not only stones captured during play, but also dead stones left on the board (stones that cannot live but haven't been removed) must be taken off the board and placed into the opponent's territory before counting.

What this means in practice:

Being captured does not subtract from your own score. The real loss is that those stones could have occupied territory.
Extreme example:

· Both players enclose 20 points of empty territory.
· You lose 20 stones during the game.
· Your opponent must place those 20 stones back into their own 20 points of empty territory → their territory becomes 0.
· Your 20 points remain unchanged.

Final: You 20 : Opponent 0 → you win.

So losing many stones makes you lose not because you are penalized, but because your stones fill up the opponent's territory. This reflects the core principle of Chinese rules: "Every stone and every empty point counts as territory."

Simple difference from Japanese/Korean rules:

In Japanese/Korean rules, captured stones are kept in a bowl and each counts as 1 point at the end. Chinese rules don't require you to save captured stones — they are all filled back during counting, and the final result is mathematically equivalent.