Event: Division Five

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Opponent Rating Result
Ray Hall 123 0 - 1
Dennis M Horsley 98 ½ - ½
Phil F Staley 106 ½ - ½
Islem Mahmoud 82 1 - 0
Michael Delaney 0 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

82 = (409 + 400 * (1 - 1)) / 5)

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