Event: Division 2

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Opponent Rating Result
Isha A Aggarwal-Stanbridge 1396 0 - 1
Colin L Ellis 1495 ½ - ½
Michael GA Wilson 1668 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1253 = (4559 + 400 * (0 - 2)) / 3)

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