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New Rating System

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CHrankAdminDeinFreund
10 months ago

We have recently switched to a new rating system. Elo is being replaced by Whole history rating. Although generally very similar to the old ratings, this means that rating values have changed for every player. Here are the most important things to know about the new system:


Core concepts that remained the same


  • Winning increases your rating, losing decreases your rating.
  • Defeating a higher rated player counts more than defeating a lower rated player.
  • Chance of victory is derived directly from the difference in rating between two players.
  • Rating decreases during periods of inactivity but is fully restored after playing a few games.


Main differences to the old system


  • The rating reacts faster to skill changes, especially noticeable for newer and casual players.
  • Instead of a single rating, the entire history of each player is memorized.
  • There are small daily rating adjustments. These are independent of activity and serve to optimize the rating's accuracy based on past games.


Why change a working system?


  • Lessen the impact of smurfs due to much faster rating adjustments even for old accounts.
  • More accurate and stable ladders that are less susceptible to the outcome of single games.
  • The new system is a base for additional statistics that weren't possible before.


This is just a very basic summary. If you want to learn more I suggest you check out the related forum thread or the original publication.
+4 / -0

LUrankAnir
10 months ago
so the elo system will be completly repealed? (Top Lists etc?)

What will happen with the color system, that shows more ore less the elo lvl of the player. Will it be adapted to the new system?
+0 / -0



CZrankAdminLicho
10 months ago
It's already done.. :-) Current rating is WHR.. a tthe time of this post at least.
+0 / -0

LUrankAnir
10 months ago
ok, but the toplists stay in elo or will that be changed too?
+0 / -0

DErankAdminmojjj
10 months ago
so, like for the last 8 minutes?
+0 / -0



CZrankAdminLicho
10 months ago
It just claims it is "ELO" in fact it is WHR .. you can tell if you can see +- range in your skill like
"Casual rank: 27. (1822 ± 40, Top 21.8%)"
+0 / -0

LUrankAnir
10 months ago
Oh now i get see, my elo dropped by 150 -.-

Well: Casual rank: 4. (2004 ± 14, Top 3.2%)

but if with rank 4 im in the top 3.2%, that would mean that the zerok community only has 125 active players.
Did the zerok community rly became that small?
+0 / -0


CHrankAdminDeinFreund
10 months ago
(edited 10 months ago)

The rating number you see can be interpreted just the same as Elo. The equation to calculate the win probability is the same and average rating is the same. The only difference with WHR is in how your rating changes after every match.

LUrankAnir the requirements to be included in the ratings are a little harder than with the old rating. You need to actually be "ranked" in order to be included on the ladder, thus the ratings only include players who play regularly enough to perform consistently.
+0 / -0


AUrank4hundred
10 months ago
Rating decreases during periods of inactivity but is fully restored after playing a few games.

So if say Godde or Svatopluk returned, played 4 games, theyre 2400 elo would be restored instantly? .. would that be accurate?
+0 / -0


CHrankAdminDeinFreund
10 months ago
(edited 10 months ago)

Not exactly. With the old system, Godde would regain pretty much exactly his old elo with slight changes. With the new system, the recent games will be weighted much more than his old games, which means he might return with a completely different rating.

The system assumes his rating didn't change and then uses the recent games to confirm this assumption (or disprove it).
+1 / -0



AUrankAdminGoogleFrog
10 months ago
There seems to be a bug that makes rating completely invisible. The ladder is empty and all ranks are grey. I have not reverted WHR because MM and balance seem to work still. Hopefully DF or Licho will fix it later.
+0 / -0


JPrankgajop
10 months ago
(edited 10 months ago)

Maybe I'm missing something but https://zero-k.info/Ladders seems broken (no ladder displayed)
+0 / -0



AUrankAdminGoogleFrog
10 months ago
quote:
There seems to be a bug that makes rating completely invisible. The ladder is empty and all ranks are grey. I have not reverted WHR because MM and balance seem to work still. Hopefully DF or Licho will fix it later.

+2 / -0


AUrank4hundred
10 months ago
its down at the moment i assume, but i also noticed that some people were ranked higher, yet with less 'elo' score. please debug
+0 / -0


AUrank4hundred
10 months ago
I was always taught in school to give a graph a title and correctly label the axis
+7 / -0

NLrankmalric
10 months ago
Would help to put some explanation of the ranking percent (like what you mentioned here, but by the rankings). Like "you are 48% of people that played in last 2 months" - or anything similar. Also the +/- will decrease with more games you play and increase when you are inactive?
+0 / -0


CHrankAdminDeinFreund
10 months ago
(edited 10 months ago)

AUrank4hundred can you show me an example of where you think the ranking was wrong?

AUrankAdminGoogleFrog there is a problem with lobby account updates. Currently your lobby rating will always be lagging behind. This should be fixed soon.
+0 / -0



AUrankAdminGoogleFrog
10 months ago
That isn't a problem with lobby value updates, I don't want to spam updates and my rank updated an hour or so after your main fix. The issue was the everyone was appearing as unranked, after previously being ranked, and the ladder page emptied.
+0 / -0


AUrank4hundred
10 months ago
no its not doing it now, but initially, it was simply not ordered correctly in 2 spots i saw, showed:

eg:
21 .player: 1847
22. player: 1855
23. player: 1833

Most likely corrected now
+0 / -0


CHrankAdminDeinFreund
10 months ago
To add a quick description of what the numbers mean. For example in "Casual rank: 27. (1822 ± 40, Top 21.8%"

”27." is your rank among active players. Being active means having played around ten matches during the last month or 5 matches today if you were inactive before. These match numbers are different for every player, because activity is defined by the uncertainty ("± 40") being below a global cutoff.

"1822" is your rating as estimated from your most recent game. It is recalculated daily in order to make fine adjustments based on the opponents you played against. For example when you played against a smurf and lost rating, this rating will be restored if the system successfully identifies the smurf. Your visible rating will also start "decaying" as soon as your uncertainty rises above 20. Decay is proportional to uncertainty.

"± 40" is your rating uncertainty. It will generally decrease the more games you play. The only exception is if you start playing completely outside of your expected skill range. Uncertainty slowly increases over time, linear to the square root of days since your last game. Besides being used for decay and as the activity threshold, uncertainty specifies how much your rating will be affected by upcoming games. Very active players with a low uncertainty will only see rating changes in the single digit range, while the rating can jump hundreds of points for a newbie or an old player coming back.

"Top 21.8%" this is your percentile among all active players. The lower, the better.


+2 / -0
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