4: USCF chess rating categories
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Scoring Systems in Chess Tournaments
Chess: What's a Good Rating?. How good are you at Chess? What is
Average Player Rating? It Depends.
Roanoke Valley Chess Club
Chess Ranking System: A Complete Guide
CSCA Informant – Observations about Chess Rating Distribution and
The Mathematics of Elo Ratings. Calculating the relative skill of
Chess Rating Systems - A Beginner's Guide
Chess Ranking System: A Complete Guide
Chess Ratings - All You Need to Know
US Chess Federation
The B6 Files - A Hypermodern System Aiming To Attack the Center
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por adulto (o preço varia de acordo com o tamanho do grupo)