To get a general rating reflecting my level, do I need to play the 3 sizes of board and the 3 kind of time settings?
For example, if I play only correspondence games on 19x19, and get a rating of let say 2100, and then I have a rating of 1150 in all other 8 kind of games, how my general rating will be distorted?
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Not at all, those expanded ratings are informational only and are separate pools from your overall rating, which is used for game pairing and ranking. All speeds and board sizes contribute equally to your rating, so play whichever you prefer 
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My question is similar, but somehow more specific. If you played just for fun one (or few) rated game(s) in a size/time-setting that you are not used (or you realize you don’t like to play with) and you got some bad results, then will be your general rating affected forever by the negative rating registered in such size/time-setting? My understanding is: yes.
Consequently, if you want to see your general rating reflecting the rating of your preferred size/time-setting, you should avoid at all to play with other combinations. If you already made that, the only way to get rid of it is to play again in those other sizes/time-settings to get better results reaching at the end a similar level in strength of your preferred combination.
Is this correct?
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After say, 20 games or so, I’m fairly sure that any older games are going to have a negligible effect on your current rating. It doesn’t pin your rank down any more than older games at the same speed/size you usually play do. I rarely play blitz, and my “blitz only” ratings are still roughly the same as they were in 2016, but if I currently win ~50% of my games against [whatever rank] my overall rating will be at [whatever rank] even if I occasionally play blitz and lose 100% of those games.
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Everything you said is wrong. Your overall rank (the only one of any consequence) is primarily decided currently by your most recent 15 games and the overall rank you were at the start of that period. Size and speed settings have no consequence whatsoever.
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Happy to know that I was wrong.
This means that for a specific size/time-setting the rating is calculated in the same way on the last 15 games played over such combination only?
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aaah yeah I believe so… they should all be calculated the same way, just from different pools
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Thanks BHydden.
Small suggestion: it should be reported somewhere. Probably linked to a small (?) question mark over the table because it is no so obvious that the overall rating is not the sum (or the weighted average) of the other pools. I think this is a useful clarification especially (but not only, I think) for new users.
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In any case, it seems that the rule of the last 15 games doesn’t apply for any pools.
Taking as example @timuzhti game records (sorry if I use your record as an example since my record is affected by different combinations), he played in the last 15 ranked games only correspondence on 19x19 board.
His rating table reports different ratings in overall position (2312) versus the 19x19/correspondence (2355). Also, the overall rating on a 19x19 is different (2224). If what we said above is true, the three mentioned numbers should be equal. This rating table is not clear at all what it means and how it is calculated.
Still considering that I’m wrong, it is not clear to me what is instead correct.
For example, what is the difference between overall 19x19 versus correspondence 19x19 if the other time settings don’t affect the leftmost column? If those numbers are affected only by the last 15 games made on a 19x19 the information should be redundant and the result should be the same. This is not the case as you can see.
Is there someone that can explain how the rating table works?
It is just a curiosity, I’m not obsessed by the rank, but since this is one of the parameters that help me to understand my progress, it would be nice to have an explanation of such a richness of information made available in the rating table.
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Generally the recalculation works like this: it takes your rating 15 games ago and looks at the results of recent 15 games and applies black math to it to get a new rating.
We have separate ratings (and other glicko parameters) for each category (16 categories in total).
So if you played 9x9 correspondence it’s going to change 9x9 correspondence, correspondence, 9x9, overall ratings. In each recalculation the rating algorithm is going to use ratings (and other parameters) for that category. And changes will be all different.
Imagine playing 9x9 with someone who hasn’t played 9x9 at all but played lots of 19x19. Since they have an established overall rating (from their 19x19 games) this 9x9 result will have significant effect on your overall rating. But in the category of 9x9 they have basically “?” rating and therefore the result won’t have a big effect on your 9x9 rating.
Essentially these categories are decoupled. Each category doesn’t know what other categories are doing and is doing rating changes on its own. Yes, they share some games but in practice these are very different rating systems. Kind of like comparing your rank on foxy and kgs.
You can refer to @flovo’s conversion tables, they show generally what rating in one category corresponds to in another category. They say if you look at the graphs for too long, you can see god.
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