Event: John Davis 6200 League

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Opponent Rating Result
Kamal Gardi 1300 0 - 1
Joshua Gibbs 1510 0 - 1
GS Cannon 1471 0 - 1
Rob Haseman 1390 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1218 = (5671 + 400 * (1 - 3)) / 4)

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