How is the game scored

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I think there have been extensive discussions about this like here

Komi needs correction on 9 x 9

I am tired of Komi issues on 9 x 9. Where is the rule that any board size besides regulation need to grant white 6.5 points for going second? Let’s assume that 19 x 19 is the only board size which matters. When Komi was introduced, it was deemed that white should get compensation for going second. On a regulation size board – 19 x 19 – a compensation of 6.5 points represents 1.8% (0.018005540166205) of the 361 available points. With the brilliant minds who have studied the regulation size to …

In short Komi is the same for all these board sizes but handicap is different