Event: Doncaster League

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Opponent Rating Result
Phillip J Battye 1629 0 - 1
Rob Vincent 1642 ½ - ½
Patrick McGrath 0 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

957 = (3271 + 400 * (0 - 1)) / 3)

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