Event: Altrincham

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Opponent Rating Result
Arjan Robinson 986 1 - 0
Harry Rafferty 1285 1 - 0
Matthew Poon 1261 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1311 = (3532 + 400 * (2 - 1)) / 3)

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