Event: Doncaster League

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Opponent Rating Result
Sean O McDonald 176 0 - 1
Tim Prosser 144 1 - 0
Sean O McDonald 176 0 - 1
Martin S Simmonds 149 ½ - ½
Pete Micklethwaite 154 0 - 1
Neil R Lowther 155 ½ - ½
Arnold Van der Hulst 124 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

40 = (1078 + 400 * (1 - 3)) / 7)

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