Event: Division 4

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Opponent Rating Result
Julian N Hawthorne 128 1 - 0
Roger W Walker 127 0 - 1
David A Fuller 108 ½ - ½
David A Fuller 108 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

18 = (471 + 400 * (1 - 2)) / 4)

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