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Event: Average under 1800

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Opponent Rating Result
Andrew J Chapman 1400 0 - 1
Mahmoud R Tarabad 1400 1 - 0
Dave Wells 1705 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1502 = (4505 + 400 * (1 - 1)) / 3)

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