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this conversion right for new grades?
Posted: Tue Aug 11, 2009 11:08 am
by Ian Lamb
Re: this conversion right for new grades?
Posted: Tue Aug 11, 2009 11:10 am
by Alex Holowczak
The most important piece of information on that document:
"This document was last modified on 17th Sep 96"
Yes, it was correct. Now, it isn't.
Re: this conversion right for new grades?
Posted: Tue Aug 11, 2009 11:11 am
by John Upham
Ian,
As usual, the discussion is already taking place in another thread...
This is the nature of discussion.
J.
Re: this conversion right for new grades?
Posted: Tue Aug 11, 2009 11:25 am
by Ian Lamb
ok anybody got a new conversion link then please ?
Re: this conversion right for new grades?
Posted: Tue Aug 11, 2009 11:35 am
by Ben Purton
I think
2100=180
2150=190
2200=200
2250=207.5
2300=215
Re: this conversion right for new grades?
Posted: Tue Aug 11, 2009 11:42 am
by Alex Holowczak
Ian Lamb wrote:ok anybody got a new conversion link then please ?
ECF * 8 + 650 = Elo
ECF -> Elo
100 -> 1450
120 -> 1610
140 -> 1770
160 -> 1930
180 -> 2090
200 -> 2250
220 -> 2410
240 -> 2570
260 -> 2730
Given the formula, you can fill in the gaps.
Re: this conversion right for new grades?
Posted: Tue Aug 11, 2009 1:30 pm
by Richard Bates
Alex Holowczak wrote:Ian Lamb wrote:ok anybody got a new conversion link then please ?
ECF * 8 + 650 = Elo
ECF -> Elo
100 -> 1450
120 -> 1610
140 -> 1770
160 -> 1930
180 -> 2090
200 -> 2250
220 -> 2410
240 -> 2570
260 -> 2730
Given the formula, you can fill in the gaps.
On what basis has the formula changed?
Re: this conversion right for new grades?
Posted: Tue Aug 11, 2009 1:34 pm
by Alex Holowczak
Richard Bates wrote:
On what basis has the formula changed?
There isn't an explanation on the website. It literally just has the formula and that's all.
Re: this conversion right for new grades?
Posted: Tue Aug 11, 2009 1:59 pm
by Roger de Coverly
Richard Bates wrote:
On what basis has the formula changed?
There should always be an 8*ECF in the formula because 25 ECF points is the same "should score 75%" as 200 Elo points.
The "traditional" +600 has been suspect for years, not as some believe because of deflation in the ECF system, but because of inflation/rating best results at the then foot of the international system.
Whether + 650 is correct, I don't know. It's probably about right at the 2100 mark anyway. At 175 the "red" grades are only about 5-10 points above the traditional grades. As a conversion for determining 4NCL board orders or seeding unrated players in rated events it's good enough.