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Topic: RATINGS CALCULATIONS
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| I would like to bring up to your attention that if the ratings are calculated with the current rating at the end of a match then this is wrong altogether. |
This can be seen from two sides, so I wouldn't say what the system does is wrong.
If you want ratings to be predictable then yes, I agree, the ratings should be calculated using the ratings of the players when the game begins. If, on the other side, you want ratings to be as accurate as possible, you want to use the last rating available for a player, because ratings get more accurate the more games you play.
Think about the example you gave in the previous post (sorry Ruben to use your name!). It's obvious that if Ruben went from 2879 to 1000 after losing a few games he is not a very good player, he probably got lucky in his first few games but then showed that he didn't deserve such a high rating. If you beat him you are not beating a 2800+ player, you are most likely beating a 1000 player, so to me, it is more appropriate to calculate your rating as beating a 1000 player than a 2879 player.
You can argue that then it is always risky to play someone you don't know well because his/her rating may drastically change after you begin your game. But the risk is not really there, because if you are an established player playing an unrated or provisional player your rating is protected. If you are playing an established player than the rating is unlikely to change much, as you already know established ratings are adjusted by small increments.
What do others think about this issue? Let me know, if the general opinion is that ratings should be calculated the other way I would have no problem changing the system.
Miguel
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Since it is my understanding that www.queenalice.com abides by the USCF rules for correspondence chess I decided fit to ask them directly:
Dear Sir/Madam,
I am playing correspondence chess on a website that abides by the USCF regulations (www.queenalice.com) Recently I had a question regarding ratings calculations. Apparently the developer of the website was using the ratings at the end of the game to calculate the ratings change instead of the ones used at the beginning of the game.
For example:
Ruben who has a rating of 1000 plays three games against opponents rated 2000, 1800 and 1900. After beating the 1800 guy the rating of that person had changed to 1345. He then drew against the 2000 whose rating at the end of the game was 2700, and lost against the 1900 whose rating remained unchanged. What ratings should Ruben use to calculate his new rating 2000, 1800 and 1900 or 1345, 2700 and 1900?
With kind regards,
* Name witheld * 
Please understand that it is not big deal to me and that even if I have to start all over with a zero rating I would still continue playing here 
Such a great community of good players and a beautifully developed website...
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Personally I prefer the current system.
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Also i think the current system is no bad.
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This is not a matter of preference but what is done by the rules of correspondence chess. Rating changes calculated from the rating at the end of the game are prone to manipulation by the players in the way I showed:
I started playing a 2500 rated player and at the end of the game my opponent managed to lose 100 rating points while he stalled and waited for me to win another couple of games to minimize his rating loss.
It is a strong argument against the current system at www.queenalice.com for calculating ratings.
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