Event: Doncaster League

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Opponent Rating Result
Peter Convery 153 0 - 1
Chris Bennett 154 1 - 0
T Ed Sowerby 137 0 - 1
John E Beech 125 ½ - ½
Ian Farrow 108 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-25 = (677 + 400 * (1 - 3)) / 5)

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