Does 6.5 Komi points genuinely matter on 19x19 board?

[jlt]

Yes OGS is wrong. And not only that, the whole calculation of rating points for handicap games looks wrong

Found a bug(maybe?)

I made a test with two players A is 1.0d (rating 1920) B is 9.0k (rating 1305). Both have volatility 0.06 and deviation 65. They play an even game. If A wins then A’s rating increases by 0.7 and B’s rating decreases by 0.7. If B wins then A’s rating decreases by 23 and B’s rating increases by 23. They play a 9-stone handicap game. If A wins then A’s rating increases by 11.7 and B’s rating decreases by 20. If A loses then A’s rating decreases by 11.3 and B’s rating increases by 3.7. [Capt…

(Assuming the rating calculator tool Play Go at online-go.com! | OGS reflects accurately what is done on the server.)