Event: OTB "Friendly" Matches

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Opponent Rating Result
Voldi Gailans 1297 0 - 1
Paul Read 1293 1 - 0
Ray Chu 0 ½ - ½
Frank Williams 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

548 = (2590 + 400 * (1 - 2)) / 4)

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