Event: Doncaster Jamboree

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Opponent Rating Result
Alan J Smith 1592 1 - 0
T Ed Sowerby 1581 0 - 1
T Ed Sowerby 1582 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1452 = (4755 + 400 * (1 - 2)) / 3)

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