Does 6.5 Komi points genuinely matter on 19x19 board?

[shinuito]

Cool, thanks for looking over it.

I just grabbed another game that finished a few mins ago, screenshot their predictions while the game was ongoing, vs after the game finished, just to have a more recent example.

Mirsur vs. Civil Law

This is a 2 stone game and white won.

@jlt

The 0.5 rank shift hasn’t been implemented. The server considers that winning as White with H1 against a 5.0k is equivalent to winning an even game against a 4.0k.

So yeah I guess we’re waiting on the server to implement changes to match the GitHub repo, and then I or whoever can update the frontend to match that also.

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@jlt

E = 1 / (1 + exp(-g_phi_j * (player.mu - p.mu)))

This corresponds to the formula

I suppose this is a winning probability, and I can’t find where the handicap has been taken into account.

I meant to come back to this also. I did find previously a mention of probability and expected outcome in glicko

Basic rank maths questions

This is a good point actually, and also a reason where having some method where changes to the python code, could also update the js frontend code (as opposed to manually translating it ). Originally it was based on the python code above here, which has been updated since. That looks like it’s the opponents’ (whites) phi variable now, which was called deviation. That probably makes more sense. I suppose, if we’re not understanding each other, we can try work it out …

It looks functionally the same but it’s evaluated at different parameters, like combined variance or standard deviation of the two players rather than just one.

Now how much that changes in moving from glicko to glicko2 I’m not sure. The rating scale is a little different I think, so that might modify the means slightly by a scale factor. The main change might be whether the volatility parameter makes a difference or is incorporated into the win probability or whether it’s only relevant in the update steps or the parameters.

I meant to make time to learn more about it, try to understand how it was derived but I hadn’t gotten around to it.