Event: Doncaster League

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Opponent Rating Result
Gordon Harrison 1383 0 - 1
Richard F Hall 1775 0 - 1
Alan J Smith 1603 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1187 = (4761 + 400 * (0 - 3)) / 3)

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Opponent Rating Result
Patrick McGrath 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

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