How do USCF and FIDE ratings compare? What are the differences
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Chess.com, Fide, Lichess, and USCF Rating Comparison

Elo rating system - Wikipedia

The distribution of the German chess rating with the best-fit normal

Chess Ratings Explained – Chess Armory
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Rating Comparison Updated
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Rating Comparisons

CSCA Informant – Observations about Chess Rating Distribution and Progression – Chess Academy of Denver

Distribution of chess skill as measured by Elo rating in FIDE (blue
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por adulto (o preço varia de acordo com o tamanho do grupo)