Approximate ELO

Fragment of a discussion from User talk:Chase-san
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ELO/Glicko-2 work with differences between ratings.

The more competitors the ranking has, the more the rating difference between first and last places will be. This is normal.

But ELO has another drifting problem due to deflation. All competitors ratings going down because most retired competitors have ratings above the average.

MN15:38, 29 October 2012