Event: Darlington

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Opponent Rating Result
Olivia Sanderson 0 1 - 0
David Oloyede 1539 0 - 1
Tatenda Midzi 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

380 = (1539 + 400 * (1 - 2)) / 3)

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