Hi, here comes the simple explanation, but some more data as indicated
below might of course empirically overturn this.
There are 81 points to split.
If black has 44 and white 37 points then white komi 7 there is jigo.
But when black get 1 point more white also get one point less. The
difference is 2 points - * and increasing the komi with 1 point does
not cover that *.
Black has 45 and white 36. Now with komi 8 white only gets 44 points.
Hence in the normal situation komi must be 9 in order to make the
45/36 split on the board become jigo. At least in area scoring. A
simple empirical thing is to check the results of CGOS 9x9 right now.
All white vicories are even numbers + 1/2 i.e. 0.5, 2.5, 4.5, ...
whereas all black wins are 1.5, 3.5, 5.5, .... Increasing komi with 1
does not change the result of any of these games.
But if 1 point is missing because of seki, then komi 8 matters.
So I think your statistics for komi 8.5 should be identical to komi
7.5 except for a small fraction caused by seki. You should not compare
to komi 6.5 but to 7.5 directly for this reason and perhaps include
9.5 as a reference point too.
And your sample size is of course too small yet...
Quoting Don Dailey <[EMAIL PROTECTED]>:
Magnus,
I'm getting an odd result with Mogo. I am running games at a fairly
decent level with 6.5 and 8.5 komi to see what will happen.
At 6.5 komi we get this:
* B => 289 = 0.58859
W => 202 = 0.41141*
At 8.5 komi we get this:
* B => 383 = 0.52610
W => 345 = 0.47390
*
BLACK WINS even at 8.5 komi!
When I do this test at lower levels, It is virtually a tie:
* B => 653 = 0.50038
W => 652 = 0.49962*
The low level is 512 play-outs and the high level is 16384 play-outs.
Is it possible that the correct komi should actually be 8.0? I've
always believed it to be 7.0
-Magnus
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