In this game, Black won by 5.5 points. However, near the end of the game (or indeed right now), using Estimate Score said that Black was winning by 12.5 points. There’s no ambiguity, as the game is over, so I’d expect those numbers to be the same. (And because it’s a 19x19 game, I really don’t feel like counting it up manually to see what the real score is.)
Why are these scores different, and which one is correct?
If SE “assumed” komi when there wasn’t any, white would have won the game according to SE (5.5 - 7 = -1.5). However, SE’s margin of victory for b is larger than the actual margin. Considering that SE is wrong most of the time, no one should take it seriously. It’s only a concern if the scoring algorithm is wrong, which happens from time to time - counting dame as points and vice versa.
Of course it is prone to error during mid game, or even close to end of game.
The story I am referring to is actual end of game where every space that should be filled is filled and there is no ambiguity. But due to the fact that there was a Ko during the game the rules count differently.
Score estimator always counts in Chinese rules. (Don’t ask me why, it is some programmer thing where Chinese rules are easier to preditc before the end of the game. Also why all bots play in Chinese rules.) Otherwise we would need a separate estimator for every rulesets, which would be crazy.
In Chinese rules not only surrounded empty intersections, but every stone as well are count as points.
So as far as the estimator is concerned, it counted correctly, only it counted under different ruleset, which may sometimes change the result. Which is unfortunate, but to be honest with you it is very improbable at the moment that an estimator for every ruleset gets implemented anytime soon.
Chinese rules compensate white by 1 point for every handicap stone, so the score estimator is still wrong. The score estimator counts number of stones + amount of territory + komi.
Using the current algorithm, black has 78+109+0, white has 85+89+0.5. This gives 12.5.
The algorithm should be stones + territory + komi + (handicap given - 1). White would get an additional 7 points, since they gave 8 handicap stones, which would give an estimate of black by 5.5 points.
I actually would like to know how it works. Not at low level of detail, but the main functionality. When I click in the different areas the scoring changes randomly.
What it supposed to do? (when you click on different parts of the board)
I was expecting I would be able to click on squares and change them from black to white and the other way around. I used to play Go online in an app and it used to work that way. Also if you click on a group of stones it changes it from dead to alive, and the other way around.
Hello - basically the “click to change the estimate” function is broken right now, sorry. Our developer is working on a new system for scoring and estimating and decided to rather work fully on the new one instead of trying to fix the old.