https://www.fide.com/fide/handbook.html?id=197&view=article
"6.1 If an unrated player scores zero in his first tournament, his score and that of his opponents against him are disregarded. Otherwise if an unrated player has played rated games, then this result is included in computing his overall rating."
"7.1 On the first day of each month, the QC shall prepare a list which incorporates the rated play during the rating period into the previous list. This shall be done using the rating system formula."
"7.14 A rating for a player new to the list shall be published only if it meets the following criteria:
- 7.14a If based on results obtained under 6.3 (Swiss or Team Tournament), a minimum of 5 games.
- 7.14b If based on results obtained under 6.4 (Round-Robin), a minimum of 5 games played against rated opponents.
- 7.14c The condition of a minimum of 5 games need not be met in one tournament. Results from other tournaments played within consecutive rating periods of not more than 26 months are pooled to obtain the initial rating.
- 7.14d The rating is at least 1000. (...)"
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