Event: U1800 Cup

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Opponent Rating Result
John WF McAllister 1743 1 - 0
John Price 1540 0 - 1
Judith Heffer 0 ½ - ½
Judith Heffer 1728 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1153 = (5011 + 400 * (1 - 2)) / 4)

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