2021 Rating and rank adjustments

[shinuito]

There’s a big list of tables from last year that was supposed to say that combined rating (the overall, which includes 19x19, 13x13 and 9x9) was just as good of a predictor of who would win as the individual ratings for each size (which ogs also keeps track of)

2020 Rating and rank tweaks and analysis

tl;dr - Ratings and ranks have been tweaked a little, there should be a bit less volatility in ranks now. Ratings and ranks have been adjusted retroactively. Main changes: We were using fixed windows to update ranks, considering up to 15 games at a time to update your rank. When we got to the 16th game, we’d “commit” your rank and start a new block to update your ranks. We now use a sliding window, so we look at your most recent 15 games (up to 90 days), and use that to update your rank, this…

Does that mean that if you play only 9x9 that your overall rank is your rank for any other board size or go association purposes? Nope! It just means what it means, that on OGS if you play another player with lower rank you should have a better chance of winning. Maybe in some cases the individual board ratings would do a better job, but on average the overall isn’t supposed to be too bad is what I drew from it.

We also don’t really know at the moment how well the new OGS ranks will map to other ratings systems, but after a lot of games are played maybe there’ll be enough data and settling of ranks to draw up new conversion tables.