USCF to Fide Conversion

Hi All

Does anyone know what the realistic conversion is for the above?  If there is no actual comparison then what are your USCF grades and your Fide grades so we can see if there is a pattern?

Thanks

A

USCF = 720 + 0.625*FIDE  if FIDE < 2000
USCF = -350 + 1.16*FIDE  if FIDE >= 2000


http://www.glicko.net/ratings/report08.txt

Nope, I don't think so.... let me see if I can phrase this properly:

Two mutually exclusive sub-sets fill the plane in that you can't be rated both <2000 and >=2000 simultaneously.

The plane is the set of all rated FIDE players.

p.s. I hope my old Maths professors haven't taken up chess!

Looks realistic enough. Haven't seen this formula before, thanks.

Thanks all

Pogonina = adorable

If I did the algebra correctly, that means my 1939 USCF rating is equivalent to... a 1950 FIDE rating? But I thought FIDE ratings were supposed to be deflated compared to USCF. So I guess USCF is only inflated once it gets really high for some reason? Strange.

According to that formula, FIDE ratings are higher than the corresponding USCF ratings when the FIDE rating is between 1921 and 2187.

can someone explain the formula in english?

But doesn't your example suggest that things can go both ways? If that happened all the time (gain FIDE but lose USCF due to some people not having a FIDE rating), your FIDE rating would actually start to become higher than your USCF.

I mean, yes, the fact that some games are uscf rated, while others are fide rated, will probably make them different, but I don't see why uscf rating couldn't be either inflated or deflated, depending on the person.

Of course, player pool is important -- for example, if there were four 1600 players who only played each other, and they all improved their chess skills at the same rate, they would all still be 1600 because their results wouldn't improve against each other.

Obviously, that example is extreme, but typical USCF tournament players, such as myself, mainly play a lot of chess in the US, so their playing pool will be isolated from other countries.

So perhaps USCF could have just as easily been deflated -- it just happened to be the opposite in this case.

!!!!!

What do you two, shadowknight911 and Estragon, refer to when you say " factors?" Do you mean that FIDE rating is less sensitive? Or is the reason for the difficulty in advancing simply that there are less opportunities to play FIDE rated games compared to USCF games?

I guess that makes sense. If you start at 1600 FIDE, and are improving, but only play a few FIDE games per year, it could take a long time to get to say 2000 FIDE because it often takes many games for the rating to start reflecting your playing strength, which is a hard thing to do if your playing strength is constantly changing. I mean, hell, that even happens with me in the USCF system. A lot of times I will play players 300+ higher rated than me, so my rating will often stay the same; true, I might get the odd win or draw here and there (resulting, perhaps, in a net gain in rating), especially if I am improving, but since I only play one tournament per month, it could take months for that to happen.

However, if that is the reason that FIDE lags below USCF, couldn't one then argue that if your USCF rating is 2100, and your FIDE rating is 2000, that you play like a FIDE 2100, but haven't played enough FIDE games to reflect that? This argument is probably flawed.

Ok, thanks for the info. It seems like the level of inflation could vary a lot depending on the player, with some having a lot of it, others not so much. And apparently Shadowknight is experiencing some deflation right now

I have to admit that this thread is making me lose interest in chess...back to tactics trainer!

Check out this handy tool that converts your USCF rating to FIDE:

http://beginchess.com/2017/03/04/chess-rating-conversion-tool/

Those thinking USCF under 2000 translates to a higher FIDE rating are using the equation incorrectly. The equations given translate FIDE to USCF.  Here they are in terms of converting a USCF rating to an FIDE rating:

under USCF 1970: FIDE = (USCF - 720)/0.625

equal or over USCF 1970: FIDE = (USCF + 350)/1.16

The conversion tool chessbuzz provided takes more off a 2000+ rating than this formula and less off a mediocre rating.

This handy tool:  http://beginchess.com/2017/03/04/chess-rating-conversion-tool/ converts a 1625 USCF rating to a 1549 FIDE rating, and if you use the formula above, then a 1625 USCF is 1735.  So there is something wrong somewhere. 

According to US Chess, 180 + 0.94 × FIDE if FIDE ≤ 2000
20 + 1.02 × FIDE if FIDE > 2000