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Game result (chess) S. Ligon, 2321 M. LaDuke, 2326 1/2-1/2 See game 152178 |
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Heinz-Georg Lehnhoff (2006-06-14 15:20:18)
Rating formula
(repetition)
Heinz-Georg Lehnhoff (2006-06-14 15:32:51)
Rating formula
Hello Thibault!
Where can I found the exact rating rules of FICGS? I have found only these lines in the Memberships - Terms and Conditions:
"11. 7. Rating rules
The FICGS rating scheme is a numerical scheme, in which percentage results can be exchanged into rating differences, and rating differences into percentage performance probabilities. It is mainly based on the principles of rating calculations of prof. Arpad Elo.
The rating formula : New Elo = ((16 x Elo) + (Games x Perf)) / (16 + Games) ..."
What means "mainly based"?
You write in another topic
"1. The rating system do not take account of wins when the ELO difference is superior to 350 points "
Is this valid only for wins or for all games with a rating difference of more than 350 points?
Wayne Lowrance (2006-06-17 19:02:07)
Rating formula
Okey Dokey, I understand. Wayne
Thibault de Vassal (2007-01-21 14:31:00)
Chess ratings
Hello to all.
I have been submitted this case :
"Rating system: Look at this situation: Current rating ot the player: 2200, 10 games, all players with TER 2200, result 9=, 1+ Case 1: Finished games: 01.01-28.02: 9= --> New rating 01.03: 2200 01.03., no other finished games in this period: --> New rating 01.05: 2228 Case 2: Finished games 01.01-28.02: 9=, 1+ --> New rating 01.03: 2200 --> New rating 01.03. 2214 In case 1 the value of the won game was 28, in case two it was 14. IMO the value of a result should not depend from the number of games you finish in a period. The value of a result only should depend on the rating of both players that they have at the start (preferable) or at the finish date of the game and the result. And the rating formula should be like NewRating = LastRating + SumOfAllValuesOfFinishedGamesInThisPeriod. That's the way (idea) IECG is computing the ratings."
This result looks quite normal to me as a player's level may increase as time passes. Rating calculations are done after periods long enough to avoid big differences... I don't know if you're right about IECG rating calculation, FICGS ratings seem to evolve quicker and I think it's best. By the way this system is used by several chess federations.
Best wishes.
Heinz-Georg Lehnhoff (2007-01-21 15:16:26)
Chess ratings
I have formatted my message (and partly corrected) to be able to read the text better.
Rating system:
Look at this situation: Current rating ot the player: 2200,
10 games, all players with TER 2200, result 9=, 1+
Case 1: Finished games:
01.01-28.02: 9= New rating 01.03: 2200
01.03. 1+, no other finished games in this period: --> New rating 01.05: 2228
Case 2:
Finished games 01.01-28.02: 9=, 1+ --> New rating 01.03: 2214
In case 1 the value of the won game was 28, in case two it was 14.
IMO the value of a result should not depend from the number of games you have finished in a period. The value of a result only should depend on the rating of both players that they have at the start (preferable) or at the finish date of the game and the result. And the rating formula should be like
NewRating = LastRating + SumOfAllValuesOfFinishedGamesInThisPeriod.
That's the way (idea) IECG is computing the ratings.
Scott Nichols (2012-02-24 20:56:24)
Folding in Poker
I don't know what you did or why with the rating formula, and it doesn't matter anymore. I took some time off from poker, but now I resolve to be back on top by the end of the year, :) At least my peak of 2258 has never been approached.
Garvin Gray (2012-02-25 13:57:13)
Folding in Poker
Ok, the main question to me is-
Which system is more able to predict the rules of a match before it begins?
If it was the first system, then that should return. If it is the current system, then keep it.
A more responsive system is usually better, but in the case of ficgs, this may not be good for two reasons:
1) While in otb chess/poker, there are very few mass time outs by a player, online this can occur, as is seen 'regularly' on here.
2) In otb chess, players do not have any kind of official rating until they have played a certain number of games.
This then means those early games to not affect all the other players ratings, which is not the case on here.
In terms of predictive accuracy, which is more accurate? That is the only consideration for me.
When I said that the ratings should be re-run, I did not mean we should start the ratings from scratch and begin from day one.
What I was saying is that ALL the previous results should be re-fed back into the system with the new rating formula and the ratings adjusted accordingly.
Then this would give information to compare as it would contain one set of ratings all measured by the same rating formula.
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