Event: Durham City Club Tournament

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Opponent Rating Result
George Gazis 1947 0 - 1
Vaughan Davison 1585 0 - 1
Geoff Raw 1351 1 - 0
Andy Proudfoot 1547 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1508 = (6430 + 400 * (1 - 2)) / 4)

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