Event: Doncaster League

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Opponent Rating Result
Neil R Lowther 1892 0 - 1
Luke J Smith 0 0 - 1
John E Beech 1665 0 - 1
Patrick McGrath 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

689 = (3557 + 400 * (1 - 3)) / 4)

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Opponent Rating Result
A David Smart 1567 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1967 = (1567 + 400 * (1 - 0)) / 1)