From  Message 
b_irie
10/22/2004 11:40:49 [ report this post ] 
Subject: England Rating
Message: Does someone know how the English rating system differs from ELO? I've been told it's some simple calculation, but can't remember.

potus
10/22/2004 13:10:39 [ report this post ] 
Message: to convert BCF gradw to elo, you either add 600 and multiply by 8 or add 800 and multiply by 6, can't remember which

bonsai
10/23/2004 02:57:39 [ report this post ] 
Message: It used to be
1. multiply by 8
2. add 600
I.e. BCF 175 is/was approximately Elo 2000. However I believe something else has been suggested/introduced recently, what I've heard about it didn't make much sense to me though  the formula I've quoted above does seem to give a reasonable idea of playing strength  at least at my level plus or minus a couple of hundred elo points.

blindio
10/26/2004 06:12:49 [ report this post ]  From the BCF diary 20045
Message: Begin quote
Grading Conversions
BCF x 8 + 600 = Elo
(Elo  600) / 8 = BCF
This applies to national ratings. It also applies to FIDE ratings greater than 2327. For FIDE ratings lower than this, and for CF grading purposes only, a different formula is used. (FIDE  1250) / 5 = BCF.
End quote.
Now my BCF rating is at present a lowly 91. Which, according to the first formula that the book gives, equates to Elo 1328. Fair enough. I haven't a clue what the second formula is for, but it seems to mean that the BCF graders might decide that a FIDE rated player of, say, Elo 1705, if he comes to play here in the UK and asks for a BCF equivalent grading will be graded using the second formula and be given a grade of, well whaddya know, 91!
If anyone can explain this please do. I haven't a clue!
Chris

chrisp
10/26/2004 13:02:55 [ report this post ]  BCF
Message: Every since the rating system was centaralised in Uk a few years ago, a study was performed to compare the BCF ratings to ELO and FIDE ratings.
It was discovered that the relationship with the old formual only worked for certain rating ranges  hence they introduced a second formula for certain playing levels.
This means that the conversions follow the graph of grading comparisons at all levels.
I do agree however that things are now more confusing than they used to be.
Thanks
chrisp

bonsai
10/27/2004 01:46:39 [ report this post ] 
Message: Having played tournament chess in both England and Germany I do have the feeling that that new formula doesn't really convert playing strength very well  when I last played in England my BCF rating was around 160 and my DWZ was 1828 (=115.6?! the "old" conversion 154 makes more sense to me  I was more active in England in those days, so my BCF rating was probably lagging behind a bit). One problem of course is that until very recently there was no Elo below 2000 and particularly the lower Elo ratings were definitely inflated compared to higher Elo ratings (due to a rating only being handed out when you managed to get one above 2000, otherwise the results were "forgotten")  hence a conversion formula for Elo ratings is going to be somewhat off for German ratings.

cryptos
10/28/2004 10:33:48 [ report this post ]  blindio  bad maths.
Message: hey blindio > (1705  600)/8 = 1105/8 = 138.125, not 91. It wouldn't make sense otherwise. Regards, Cryptos :).

cryptos
10/28/2004 10:36:36 [ report this post ]  whoops, sorry. :(
Message: sorry, blindio, I should've used the second formula, which is obviously unfair. Regards, Cryptos :(.


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