Public forum discussion.
17 Feb 2015
Here's the message I've just got:
Game #1617000[Go Hahn Pointing System] is finished.
AlexS vs. gamesorry 30:70
AlexS
old rating: 1.7k
newrating: 1.6k
rating position: 51st
gamesorry
old rating: 4.0d
newrating: 3.9d
rating position: 7th
This seems to be an old problem: in all finished hahn games with a non 100:0 score, the game would be counted as a loss for both sides (you can check the profiles of the hahn game participants)
17 Feb 2015
I believe that the rating is correct. It looks like your rating went down by 0.1 stones and your opponent's rating went up by the same amount.
My guess is that, based on the difference between your ratings, the computer gave you roughly 0.94 win expectancy. The difference between this and the actual result of 0.7, times the K-factor of the rating (32?) gives about 80 ELO points, which is about 0.08 stones, I think.
17 Feb 2015
17 Feb 2015
17 Feb 2015
Ah, now I see what you mean.
Yes, indeed, 50:50 should be a draw and all others should be win-loss.
I hope Richard notices this....