Why do I lose this game with 0,5 points? Please explain?

If you were White, then presumably the komi was ​ 5.5 .
If you were Black, then presumably the komi was ​ 6.5 .

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To count with japanese rules, we need to know if there are some prisoners.
Here a doubt arise, as black may have 1 (not sure it happened, i’m not counting the 3 others).

With chinese counting this position is quite symetrical and it shouldn’t be too difficult

So black has 6 more stones, and white one less as the symetry would suggest for a fair share.

That’s the score difference on the board, and now you can reduce it by the komi and see who wins. (7-komi, if positive black wins)

Note that you forgot to tell us who you are (black or white?)

Anyway, i assume the komi was 6.5 and black wins by half point.

I was black and there where no prisoners before the end of the game (so no others except the three captured white stones seen in the board). Like you said, as black I would have expected to win, but it said that I lost by 0,5 points?!

Could only happen if komi is 7.5

So I guess the game was played under chinese, Ing or AGA rules which was not clear to me, thanks for the fast answerse

It’s a so simple site that they even didn’t mention the value of the komi.

At least back when I played it, I believe
used territory scoring, rather than are scoring.

Under territory scoring, this result would come from a komi of ​ 6.5 , ​ rather than ​ 7.5 .

I am not a profesionel player, still a beginner. All I want to undestand is why I lost?! As black I have more territory + captured stones… as said it told me I lost by 0,5 points?

The very first answer linked to an article. Read that.

You have more territory + captures stones…
but not enough more, since White has komi.

Black: ​ ​ ​ ​ ​ ​ ​ 27 ​ territory ​ ​ ​ + ​ ​ ​ 3 ​ prisoners

White: ​ ​ ​ ​ ​ ​ ​ 24 ​ territory ​ ​ ​ + ​ ​ ​ 6.5 ​ komi

At the bottom of the page, under the go board, I see this explanation box: