Event: Division 4

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Opponent Rating Result
Andy Johnson 1600 ½ - ½
Adrian Grimes 1392 1 - 0
Joshua Salisbury 1415 1 - 0
Joshua Salisbury 1100 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1677 = (5507 + 400 * (3 - 0)) / 4)

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