Event: U1800 Cup

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Opponent Rating Result
Graeme Jones 1721 0 - 1
Robert L Jones 1699 0 - 1
Robert L Jones 1659 1 - 0
Jim Buis 1740 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1605 = (6819 + 400 * (1 - 2)) / 4)

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