Event: Division 1

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Opponent Rating Result
Stephen W Ruthen 167 0 - 1
Stephen Lewis 174 ½ - ½
Mark Szymanski 151 0 - 1
James Pack 159 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-137 = (651 + 400 * (0 - 3)) / 4)

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