this conversion right for new grades?

General discussions about ratings.
Ian Lamb
Posts: 496
Joined: Tue Jul 14, 2009 1:45 pm

this conversion right for new grades?

Post by Ian Lamb » Tue Aug 11, 2009 11:08 am

http://www.exeterchessclub.org.uk/bcftable.html#conv any views on this?
Top
Alex Holowczak
Posts: 9085
Joined: Sat May 30, 2009 5:18 pm
Location: Oldbury, Worcestershire

Re: this conversion right for new grades?

Post by Alex Holowczak » Tue Aug 11, 2009 11:10 am

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.
Top
User avatar
John Upham
Posts: 7218
Joined: Wed Apr 04, 2007 10:29 am
Location: Cove, Hampshire, England.

Re: this conversion right for new grades?

Post by John Upham » Tue Aug 11, 2009 11:11 am

Ian,

As usual, the discussion is already taking place in another thread...

This is the nature of discussion.

J.
British Chess News : britishchessnews.com
Twitter: @BritishChess
Facebook: facebook.com/groups/britishchess :D
Top
Ian Lamb
Posts: 496
Joined: Tue Jul 14, 2009 1:45 pm

Re: this conversion right for new grades?

Post by Ian Lamb » Tue Aug 11, 2009 11:25 am

ok anybody got a new conversion link then please ?
Top
User avatar
Ben Purton
Posts: 1631
Joined: Tue Apr 29, 2008 5:53 am
Location: Berks

Re: this conversion right for new grades?

Post by Ben Purton » Tue Aug 11, 2009 11:35 am

I think

2100=180
2150=190
2200=200
2250=207.5
2300=215
I love sleep, I need 8 hours a day and about 10 at night - Bill Hicks
I would die happy if I beat Wood Green in the Eastman Cup final - Richmond LL captain.
Hating the Yankees since 2002. Hating the Jets since 2001.
Top
Alex Holowczak
Posts: 9085
Joined: Sat May 30, 2009 5:18 pm
Location: Oldbury, Worcestershire

Re: this conversion right for new grades?

Post by Alex Holowczak » Tue Aug 11, 2009 11:42 am

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.
Top
Richard Bates
Posts: 3338
Joined: Fri Nov 14, 2008 8:27 pm

Re: this conversion right for new grades?

Post by Richard Bates » Tue Aug 11, 2009 1:30 pm

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?
Top
Alex Holowczak
Posts: 9085
Joined: Sat May 30, 2009 5:18 pm
Location: Oldbury, Worcestershire

Re: this conversion right for new grades?

Post by Alex Holowczak » Tue Aug 11, 2009 1:34 pm

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.
Top
Roger de Coverly
Posts: 21314
Joined: Tue Apr 15, 2008 2:51 pm

Re: this conversion right for new grades?

Post by Roger de Coverly » Tue Aug 11, 2009 1:59 pm

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.
Top

Return to “Rating Debate”