Event: Haslemere Trophy

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Opponent Rating Result
Ronit Sachdeva 1210 0 - 1
Ronit Sachdeva 1210 0 - 1
Michael Marshall 1390 1 - 0
Michael Marshall 1390 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1100 = (5200 + 400 * (1 - 3)) / 4)

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