Event: John Davis 6200 League

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Opponent Rating Result
Daniel Westhead 1364 ½ - ½
Christian Gorchev 1565 1 - 0
John J Grady 1620 ½ - ½
Sean Kane 1577 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1532 = (6126 + 400 * (1 - 1)) / 4)

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