[Computer-go] draw rate against even opponent in CGOS 9x9

[Hiroshi Yamashita]

Hi,

This graph is draw rate and black winrate against even opponent in CGOS 9x9.
http://www.yss-aya.com/20200704cgos9x9.png
Blue is black winrate. Red is draw rate.

The higher rating, the higher draw rate.
If it keeps going this way, all the games will be draw in 4500 ELO.
In black winrate, it seems the higher rating, the less than 50%.

There are from 110000 games from 2020-01-01 to 2020-06-30.
For example, draw-rate between programs in their 3300s are 0.444.

ELO games b-win draw w-win black winrate draw-rate
1800: 32 =( 18/ 0/ 14), 0.563, 0.000
1900: 0 =( 0/ 0/ 0), 0.000, 0.000
2000: 62 =( 28/ 7/ 27), 0.508, 0.113
2100: 296 =(132/ 23/141), 0.485, 0.078
2200: 0 =( 0/ 0/ 0), 0.000, 0.000
2300: 33 =( 14/ 2/ 17), 0.455, 0.061
2400: 68 =( 30/ 2/ 36), 0.456, 0.029
2500: 122 =( 54/ 10/ 58), 0.484, 0.082
2600: 280 =( 98/ 45/137), 0.430, 0.161
2700: 51 =( 23/ 9/ 19), 0.539, 0.176
2800: 582 =(245/153/184), 0.552, 0.263
2900: 1458 =(570/433/455), 0.539, 0.297
3000: 554 =(153/196/205), 0.453, 0.354
3100: 450 =(116/157/177), 0.432, 0.349
3200: 131 =( 34/ 52/ 45), 0.458, 0.397
3300: 124 =( 22/ 55/ 47), 0.399, 0.444
3400: 0 =( 0/ 0/ 0), 0.000, 0.000

* GNU GO is 1800 ELO.

Thanks,
Hiroshi Yamashita
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