Problem rate adjustment

[andreacoda]

I just resolved problem 49105, and this is what happened:

Last Problem: Correct
User: 1519.6(+3)
Problem:1510.8(-90.9)

How come that, for something that is in my range, I gain just 3 points, but the problem loses almost 91 points?

Sounds weird to me, may be I don’t really understand the mechanics…

I'm happy enough to be again above 1500, though... 

[kennyc]

The problem has only been attempted 4 times on each standard and blitz modes.  So the rating will have some huge swings before it finally settles into it's true rating after more people have attempted it. 

Way to go for the kill and ignore the fork on that one!

[andreacoda]

I see, now I understand!

>Way to go for the kill and ignore the fork on that one!

Many thanks for the compliment! Two things I learnt "the hard way" thanks to Chess Tempo are:
1) look if there is any obvious move - like simple hanging pieces;
2) once you found a good move,see if there is a better one!

In this case, (2) paid back 

Cheers,

Andrea

[drahacikfm]

I gain just 3 points, but the problem loses almost 91 points?

When problems are new you don't get the full change in your rating.  For a problem with no attempts yet, you get 20% of your usual rating change.  for 1 attempt 40%, 2 attempts 60%, 3 attempts 80% and after 4 attempts, the full 100%.

On the other hand the problem gets much more than the usual rating change when it is new and has only a few attempts.

The purpose of all this is to save users from losing a lot for a problem that is way under-rated, and to get the problem quickly to the rating it should be at.

[andreacoda]

Got it - thanks for the explanation, Drahacik!