Event: Division 4

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Opponent Rating Result
Caroline L Mountford 119 0 - 1
Lukasz Michalek 110 0 - 1
S Ali Arshad 80 1 - 0
Martin J Chadwick 80 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-3 = (389 + 400 * (1 - 2)) / 4)

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