Event: Open

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Opponent Rating Result
Irvin B Ortega 209 ½ - ½
Chris Chadwick 165 1 - 0
Irvin B Ortega 209 0 - 1
Chris Chadwick 165 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

187 = (748 + 400 * (1 - 1)) / 4)

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