The new ELO-based ranking system

MrRoboto

I was being unclear with what I meant with 10% decay.
I meant 10% of the difference between current ELO and 1500.

So a 2000 player would lose 10%, aka 50. And then he is 1950, so the next 10% would bring him down to 1905 and then 1865…

But yeah, I agree - that’s still too harsh.

I’m inclined to go with AndrewAAGamer…
No decay for the overall lifetime ranking.

And for the yearly playoffs we only count results from the current year anyway, so decay is not really necessary in the first place.

farmboy

@MrRoboto thanks for all the work on this.

One concern. I like the idea of capturing a players’ current strength. But because we play a small number of games I would worry here that two or three games would have too much weight. So if a player that was tier 1 (with 5 games played) ends up beating 3 tier M players in a row, that is pretty good evidence that they are at the same level and they are going to be a top player according to either the existing scoring or the ELO. But if a tier M player (with 5 games played) loses 3 games in a row to other tier M players, with the current scoring they that doesn’t necessarily mean that they are no longer tier M and I am worried with an ELO, the drop might be more dramatic. So for that reason I like that the current league scoring that averages over a year.

One suggestion. This might be onerous, but could you score a year of play so that we could see how this ends up? That would both give us a sense of how well this works and also what might need to be tweaked.

MrRoboto

I absolutely can and will add that, farmboy.
I will also add an indicator, when a player is inactive (should 6 months of not playing be considered inactive or rather 12 months?)

But in my opinion, if a player loses 3 games in a row against other Tier M players, then that player shouldn’t be considered M for the moment. He would need to prove himself again with wins to reclaim M tier…

MrRoboto

To everybody: You can help me collect past results!

It’s 3 am here and I have 3 kids, including a 3months old baby. It’s past time I go to bed haha.

Go to the Sheet that’s named “Results before 2023” and enter the data.
There are only 6 cells required and I named them so I think it’s self-explanatory

The last entry I made myself is on Page 109 of the Post results thread, I was working myself backwards…

Stucifer

@MrRoboto I can help with this shortly

farmboy

@MrRoboto so I just opened the spreadsheets. That is very impressive. I won’t have time to help now but didn’t realize you had already done so much work.

Stucifer

@MrRoboto sent you a PM as well, look for an email with a link to my spreadsheet for copying data over. I rearranged the columns on my end for faster entry the way brain reads the posts.

Got back to early november 2021 (page 93 fully completed)

gamerman01

Nice, a group project to get more years recorded. After personally and manually entering every game result for years, I have quite a strong grasp on how good each player is, in a way that can’t really be quantified with bare numbers or a formula.

So I am hoping to see how the numbers will fall with 1/1/22 to date, 1/1/21 to date, or however far we can go back. To the beginning of G40 is the dream. Shouldn’t matter much that the rule sets changed dramatically (especially balanced mod) at some points, since was even competition between many of the same players anyway.

I hope the lifetime ratings will pretty much line up with my experience and memory, and it will be fascinating to see players from years ago stack up in the same rankings against contemporaries.

gamerman01

So with a lifetime… no K factor adjustment for sensitivity, right?

MrRoboto

I would keep the K factor. It will help new players joining the community finding their correct spot in the ranking faster.

If someone really weak comes, we need that player to fall quickly otherwise the first couple of wins are overrated.
And if the next I don’t know, Napoleon or Sun Tzu, suddenly joins, we need that player to climb super fast otherwise the losses will hurt the respective players more than they should.

farmboy

@MrRoboto if the k factor is considered over lifetime (and is too sensitive) an issue might be that players that are strong now, but weaker in the past will have their past games weigh down their current ELO. If I’m right on that, instead of it being a factor in one’s first games, can it be more sensitive in one’s most recent games? That might allow new players to move up more quickly without penalizing players that have been around for a while.

pacifiersboard

@MrRoboto

mega! At first I thought like “may it be fun to play the league games whatever the ranking (system)” - but at this moment I find the project even more thrilling than going on with my games (:) mainly because you gently propose it as a matter of community! And by this you are doing great in keeping @gamerman01 's style!! It looks to me as what you @gamerman01 have fostered dearly is coming of age rather than plotting

gamerman01

@MrRoboto said in Proposal for a new, ELO-based, ranking system:

I would keep the K factor. It will help new players joining the community finding their correct spot in the ranking faster.

Ah, of course this is right.

gamerman01

@farmboy said in Proposal for a new, ELO-based, ranking system:

If I’m right on that, instead of it being a factor in one’s first games, can it be more sensitive in one’s most recent games? That might allow new players to move up more quickly without penalizing players that have been around for a while.

Or both?? Sensitive at beginning and also recent?
Or K factor that adjusts to total number of games, where the adjustment is high in the first few games, but if that player continues on to play 15 or 50 or 500, then automatically eliminates those first few game k factor and enacts the later game? MrRoboto, we think you can do anything now. :D

I suppose after 50 or 500 whatever games, the k factor being applied to the first few would be practically nil, so maybe could be applied to both beginning and more recent.

Look at those formulas. Look at that automation. We’ll figure it out.

MrRoboto

@farmboy and @gamerman01
This is not possible since that would mean to retroactively adapt the ELO change of past games when you play more recent games.
That contradicts the whole idea and is actually not even possible to implement since that creates circular references again - the biggest problem the old system had.

It’s also not necessary at all. As you, gamerman, already stated: At a certain point the first few games are completely irrelevant. That point is FAR earlier than 50 games.

Just an extreme example:
Dawgoneit is currently 5-45, with an ELO of 1059
With only 4 wins against some of the current top5 players, he can increase his rating to ~1600 even though he still is only 9-45 at that point.
The system accurately shows the current strength.

Thanks to Mr_Stucifer we now have the data of 2022 too. I think the system already looks extremely solid.

Everybody can create a copy for themselves with
File -> Make a Copy.

You can then play around and add some results as you like to see how the system behaves.

gamerman01

Um, guys?

The Hubble telescope just got the corrected lens. With another year or 15 months whatever of data (2022, some of 2021) and whatever adjustment Roboto just made,

I am super excited and happy to see this standings board. Like I said, with my experience of entering every game result and, indeed, reading comments and what all is involved with moderating the league for years,

I can tell you THIS outcome is excellent.

Screenshot 2023-10-31 10.52.24.png

Screenshot 2023-10-31 10.57.37.png

gamerman01

Now that is what it would look like if there was a “lifetime” rating starting in late 2021. This is not what 2023 would look like. And of course our past rankings spreadsheet will fill out 2023 so that playoffs are unaffected and comparability across years will be there.

But something like this, and will be better after conversations and tweaking, is coming to a computer near you in 1/1/24.

More than half the credit goes to Roboto for enthusiasm, computer ability, and pushing for improvement. I was hard to get through, but today with this spreadsheet pictured below, I am a believer and this is the future.

oysteilo

intereasting ideas… from the new elo spreadsheet my overall rating is 1673, my OOb is1546 and BM is 1552

How can my overall ranking be higher than then any of the two individual game version rankings?

gamerman01

@oysteilo said in Proposal for a new, ELO-based, ranking system:

intereasting ideas… from the new elo spreadsheet my overall rating is 1673, my OOb is1546 and BM is 1552

How can my overall ranking be higher than then any of the two individual game version rankings?

One quick explanation/example is if you defeated someone in BM who normally plays PtV or OOB and is more successful there.

oysteilo

also look at Jkeller, he is number one in overall, but I only find his name in the OOB bracket where he is 7th.

Maybe I am missing something?

The new ELO-based ranking system

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