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Komi Go Discussion
   

Dieter: It is my belief that komi is not fit for amateurs - say below 5 Dan. If you let me choose colors, I will always take white: 5.5 points in the pocket. We amateurs make so many mistakes that it really doesn't matter who begins. We are certainly not capable of maintaining the advantage of moving first. Professionals are so komi go fits them. The professional level is way above ours. If they decide 8 points is the proper komi I would strongly oppose the adoption of it in amateur games.

ChessWhiz: Yes, but OTOH, just as (according to you) we can't maintain a first-move advantage, we can't keep a komi advantage either. I often win and lose games by 10 points or more, and a komi doesn't affect that. So if both players are the same strength, one should start and the other should receive komi. If the pros find that komi should be larger, by all means, make it larger! It simply offsets the advantage of the first move, and I think it's just as hard to retain a komi advantage as it is a first-move advantage. Of course, this is all IMHO. What do the rest of you think?


SAS: Black is half a move ahead (on average) throughout the game; this advantage is there whether you are an amateur or a professional. But I think there is reason to suppose that komi should be smaller for weaker players. My reasoning is as follows. Suppose you and your opponent both drop an average of x points per move (compared to the perfect move). If Black and White both play the same number of moves, then this will cancel out (on average). But in fact Black often plays one move more than White, due to having the first move. If we assume that on average Black plays half a move more than White, then we must conclude that the komi required to make the game fair is x/2 less than the "correct" komi (which is probably 7). This adjustment is very small however - perhaps about 1 point for every 20 stones of strength. So I think a komi of 6 should be about right for most amateurs above 10 kyu. It would be good, however, to see some actual statistics for a few thousand amateur games of about shodan level, to see how things work out in practice.

The point that ChessWhiz makes about the komi not mattering so much in amateur games is correct. The higher x is, the higher its variance is likely to be, and this increases the probability that the winning margin will be large enough that the exact komi (within reason) will not matter.



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