Event: Doncaster League

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Opponent Rating Result
Alan J Smith 111 1 - 0
Colin Parrish 93 ½ - ½
Ian Farrow 108 1 - 0
Richard E Desmedt 153 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

216 = (465 + 400 * (2 - 1)) / 4)

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