Event: Doncaster League

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Opponent Rating Result
Richard E Desmedt 153 ½ - ½
Ismet Berisha 139 1 - 0
Sean O McDonald 162 0 - 1
Phillip J Battye 132 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

47 = (586 + 400 * (1 - 2)) / 4)

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