Event: Atkinson Cup

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Opponent Rating Result
David J Gibson 1573 0 - 1
Ewan Black 1528 0 - 1
Nazar Kusiumov 1350 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1084 = (4451 + 400 * (0 - 3)) / 3)

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