In the days when the ratings were cut off at 2000, a player of a 2100 standard couldn't play a rated game against a player of 1800 standard. Once you extend that range, rated games become possible, but the 2100 player maintains their rating provided they make the necessary expected score.
Yes. Well, they do if the player of 1800 standard actually has a rating of 1800.
... it is obvious that they cannot all be under performing.
There are a lot of ways that sentence could be interpreted. Let me take you by the hand and lead you through the streets of Hampstead. I’ll show you proof that, in one sense at least, they can.
Elo to ECF.
x 8 + 650.That’s the traditional conversion formula. Or - 650/8 if you want to go the other way, I suppose.
As it happens my first Elo rating and my ECF at the time were pretty much in sync. 172 x 8 = 1376. Add 650 and you get 2026, which is 23 points (equivalent to a couple of ECF points) less than my actual rating back in 2011.
Things are somewhat different now. I’ll spare you the maths. The discrepancy between my converted Elo and actual rating is now about 167 points.
Yes, I know. The conversion formula is different now. Click ‘Help’ on the ECF’s Grading Database and scroll to the bottom and you’ll see that as of January the calculation is now ECF x 7.5 + 700 = FIDE. Which brings my personal rating/grade discrepancy down to about 136 points.
Yes I know. One person’s numbers don’t mean anything. True enough, but, leaving the plenty that could be said at this point for another day, let me end by showing you a few more.
Number of games played at Hampstead since August 2013: 22Number of the 22 against rated opponents: 16Number of the 16 against opponents with ECF grades: 15
Average ECF to Elo discrepancy using the old formula: 105.27 points
Lowest difference: 13 points
Highest difference: 183 points
Number of opponents who are over-rated using the old formula: 0
Average Elo to ECF discrepancy using the new formula: 71.7 points
Lowest difference: -5
Highest difference: 169
Number of opponents who are over-rated using the new formula: 1
That’s why I have a hard time believing in Elo any more. It’s not just me, it under-rates everyone. Or everyone I play, at least.
Nearly. There was that one guy, over-rated to the tune 5 points. In case anybody is still tempted to blame all this on the kids, it’s only fair to mention that he was a junior.