Event: Doncaster League

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Opponent Rating Result
Pete Micklethwaite 2021 ½ - ½
Sean O McDonald 1908 0 - 1
Pete Micklethwaite 2027 1 - 0
David P Hatfield 1563 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1980 = (7519 + 400 * (2 - 1)) / 4)

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