Event: U1800 Cup

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Opponent Rating Result
Samuel Gaffney 1780 0 - 1
Angus Irving 1750 ½ - ½
Laurie Pott 1788 0 - 1
Laurie Pott 0 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1130 = (5318 + 400 * (0 - 2)) / 4)

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