Event: Division One

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Opponent Rating Result
Anthony Sadler 157 0 - 1
Michael J Doran 154 0 - 1
Derek Green 118 ½ - ½
Neil Clarke 154 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-154 = (583 + 400 * (0 - 3)) / 4)

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