Despite recounting 5 times, it still seems to me that the result of this game should be “white wins by 4.5” and not “by 5.5 points”: https://online-go.com/game/1424703 Is my arithmetic off the mark or is the server messing up the count (btw. it was played under AGA rules)
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Odd, my count is also W + 4.5. Sometime AGA rules can be a bit funny since W has to pass last (and passes give stones), but that doesn’t seem to be the issue here. At least it doesn’t change the game result.
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I think that it is the handicap stone that gives one additional point to white because it should not count.
Ah I missed that this game had a handicap of 1 because usually that means no komi, but I guess it doesn’t have to?
“If the players have agreed to use area counting to score the game (Rule 12), White
receives an additional point of compensation for each Black handicap stone after
the first.” (official AGA rules) This shouldn’t affect this game. If there is no seki, then area scoring without komi should produce an odd score difference (thanks to an odd number of intersections). With 3.5 komi, it should then be x.5 point difference where x is even.
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Digging through my game history I found several more games that look miscounted: https://online-go.com/game/1426649, https://online-go.com/game/1424672, https://online-go.com/game/1424694 . Can I ask other readers of this forum familiar with the AGA rules to check my arithmetic? It seems to me white has a point added for no particular reason.
I have just played a 2 handicap 13x13 game (https://online-go.com/game/1427992) and the count seems wrong again. It looks like there is a counting bug in the software. Developers, please fix it ASAP.
Huh, well that’s been broken for awhile 
I’ll get it fixed up.
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I have been experimenting a bit with other rule sets and it seems that handicap compensation is wrong in all rulesets that do it: AGA, Chinese and Ing. I know this is unlikely to change the outcome of a game but I am defenetly not going to recommend to someone to start playing on a server which counts score incorrectly. This is otherwise probably the best server on the internet, but who cares about the option to play in browser on mobile devices, voice countdown or a great community, when games are scored incorrectly?
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I already said I’d get it fixed up, thanks 
Alrighty this has been fixed up on the beta ( http://beta.online-go.com/ ) system, we’ll move it into production next patch.
AGA is the only one that has that clause it looks like, the rest give one point per handicap stone so are correct.
I think that in this game under Chinese rules:https://online-go.com/game/1460616 and in this game under Ing rules:https://online-go.com/game/1460642 white is given one point despite no handicap stones given.
Ah but both of those games do have a handicap of one 
“White receives an additional point of compensation for each black Handicap STONE.” My literal reading would be that since there are no handicap stones, there is no compensation, but I admit the other interpretation seems valid as well. Since there are no official regulations to refer to, I will probably have to accept admins’ opinion :-).
Thanks for fixing the AGA rules :-D.