Event: Doncaster League

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Opponent Rating Result
Tony Pogson 159 0 - 1
Ismet Berisha 143 ½ - ½
Colin Parrish 93 1 - 0
Neil R Lowther 155 ½ - ½
T Ed Sowerby 137 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

57 = (687 + 400 * (1 - 2)) / 5)

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