Event: Division 2

Opponent Rating Result
Barrie Quin 1529 ½ - ½
Andrew P Willoughby 1759 0 - 1
Andrew N Salmon 1841 ½ - ½
Melvin Steele 1584 0 - 1
Richard Roberts 1550 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1573 = (8263 + 400 * (1 - 2)) / 5)

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