Event: Durham League Division B

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Opponent Rating Result
Bill Wilson 1839 0 - 1
Deborah Edmundson 1444 0 - 1
Nigel Hall 1975 ½ - ½
Carl Stephens 1598 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1514 = (6856 + 400 * (0 - 2)) / 4)

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