Event: Gambit Rapidplay

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Opponent Rating Result
John R Huthwaite 1764 0 - 1
John R Huthwaite 1764 0 - 1
Marshall Redmond 1195 1 - 0
Marshall Redmond 1195 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1280 = (5918 + 400 * (1 - 3)) / 4)

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