Event: Durham League Division B

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Opponent Rating Result
Kenneth Boxall 1597 0 - 1
Stephen J Hall 1855 0 - 1
Mark T Priest 1431 0 - 1
Mark Edmundson 1306 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1347 = (6189 + 400 * (1 - 3)) / 4)

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