Event: U1800 Cup

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Opponent Rating Result
Robert L Jones 1690 0 - 1
John WF McAllister 1682 1 - 0
John WF McAllister 1683 0 - 1
Simon Riley 1743 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1500 = (6798 + 400 * (1 - 3)) / 4)

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