Event: Division 4

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Opponent Rating Result
Peter Shaw 111 0 - 1
Andrew T Leadbetter 111 0 - 1
Roger W Walker 115 ½ - ½
Ernest Wilkinson 91 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-93 = (428 + 400 * (0 - 2)) / 4)

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