Event: Doncaster League

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Opponent Rating Result
Alan Bramall 145 ½ - ½
George D Boothman 128 1 - 0
Zak Tomlinson 149 ½ - ½
Pete Micklethwaite 176 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

250 = (598 + 400 * (1 - 0)) / 4)

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