Event: Friendly matches

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Opponent Rating Result
Chris S Purry 1898 ½ - ½
Kevin Paine 1593 ½ - ½
Bob R Gore 1786 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1759 = (5277 + 400 * (0 - 0)) / 3)

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