Event: Doncaster League

Opponent Rating Result
Peter Catt 141 ½ - ½
John P Mainwaring 140 ½ - ½
Alan J Smith 111 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

131 = (392 + 400 * (0 - 0)) / 3)

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