Approximate ELO

Fragment of a discussion from User talk:Chase-san
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The real challenge is making multiple bots line up, which is about what I managed here.

Chase-san09:33, 31 October 2012

If you change the rating difference between competitors, you distort expected score estimation, PBI and specialization indexes. It is no longer ELO-like.

That´s why the code I put above shifts all competitors up or down equally.

MN18:41, 31 October 2012