brabo wrote on 05/29/12 at 11:17:36:
fling wrote on 05/29/12 at 09:49:11:
In a recent tournament I participated in, there was a price for best rank improvement. Since the price was a gift card for books, it made me start thinking a bit about the idea of this price.
I guess such a price is intended to be for the player that performs the best compared to his ability, right? In that case, wouldn't performance rating vs actual rating be a better way to measure this?
I have some examples that I can post later (from practice and a purely hypothetical one), but just wanted to ask about this. I am totally sure how it works. However, I think that at least in swiss tournaments, the rank improvement won't necessarily reflect if you perform much better than expected the same way the differential between performance and actual rating would. On the other hand I am not sure if this differential is the same for let's say a 2000 and a 1500 player (I think it should theoretically be if I've understood the rating system correctly).
I assume with rank, you mean rating?
Personally I am against any form of system based on rating for defing prices. On the rating exists a lot of deviation. It is no coincidence that almost always these prices go to youth players.
No, with rank, what is meant is really rank as in number in the starting field, which is based on rating.
Anyway, I agree that this would only work properly if the elo is showing "real" strength. But if you want to give a price, like a book from a sponsor (as in the two recent tournaments I know of), I would guess rating performance is better than how much you improve your rank (which is based on just how many points you scored and the tie-break vs how you were rated to begin with). It indirectly tells you well you did in terms of rating, but not necessarily.
Imagine a case with lots of players rated closely around 2400, and one at 1500. If the last player scores 1 point, it is a pretty good feat, and the rating performance is probably much higher than 1500. Nonethless, that person will probably finish last, i.e. no rank improvement. The person that wins might improve in rank, but have not much of a rating performance compared to the "real" rating, or did I miss something?
And vice versa, if you have 10 players rated 2000, 2001, 2002, 2004 etc. Chances are pretty high the person at 2000 might win anyway, with a high rank improvement but not necessarily an impressive rating performance.
An example:
http://www.chess-results.com/tnr70815.aspx?art=9&lan=6&fed=SWE&turdet=YES&snr=57 Rank improvement: 17 spots
Rating performance minus actual rating: 393
http://www.chess-results.com/tnr70815.aspx?art=9&lan=6&fed=SWE&turdet=YES&snr=54 Rank improvement: 25 spots
Rating performance minus actual rating: 380
Who had the best performance, i.e. who would you award a price (maybe both

)?
EDIT: I have to say I don't think it is too serious, and most of all, I don't know these players personally (It is for sure not my intention to offend anyone). I haven't thought about it at all, and rank improvement seemed ok, but then I realized that if you want to award a price like this, wouldn't rating performance be a better measure?