Event: Division 4

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Opponent Rating Result
Andy While 1500 0 - 1
David Griffiths 1585 0 - 1
Nikolai Harrison 1448 0 - 1
Ben Eyres 1110 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1211 = (5643 + 400 * (1 - 3)) / 4)

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