Event: Durham League Division B

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Opponent Rating Result
Barry Edgar 1575 ½ - ½
Tom Min 1577 1 - 0
Guy Smith 1354 0 - 1
Richard J Harris 1726 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1558 = (6232 + 400 * (1 - 1)) / 4)

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