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le groupe b est valable pour elo catalan.
group a will be valid for international and catalan title norms as well as for international, national and catalan ratings. groups b and c will be valid for international, national and catalan ratings.
arpad elo a décrit son travail dans les détails dans son livre , publié en 1978.
elo described his work in some detail in the book "the rating of chessplayers, past and present", published in 1978.