Event: Doncaster League

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Opponent Rating Result
Neil R Lowther 1895 ½ - ½
Luke J Smith 0 1 - 0
Peter JE Ackley 2118 0 - 1
Sean O McDonald 1918 0 - 1
Sean O McDonald 1925 1 - 0
John E Beech 1665 ½ - ½
Andrew Butterworth 1972 ½ - ½
Andrew Butterworth 1946 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1680 = (13439 + 400 * (2 - 2)) / 8)

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