Event: Doncaster League

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Opponent Rating Result
Martin Presley 1630 0 - 1
Richard E Desmedt 1791 ½ - ½
Ken Hunter 1804 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1608 = (5225 + 400 * (0 - 1)) / 3)

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