Event: Doncaster League

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Opponent Rating Result
Robert Bacon 109 0 - 1
Tim Prosser 136 0 - 1
Mick Henshaw 109 ½ - ½
David P Hatfield 117 ½ - ½
John P Mainwaring 136 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

41 = (607 + 400 * (1 - 2)) / 5)

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