Event: NCCA League Division 4

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Opponent Rating Result
David L Jones 1545 1 - 0
Anne Louise Bishop 1442 0 - 1
David L Jones 1520 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1369 = (4507 + 400 * (1 - 2)) / 3)

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