Event: Silver Rook

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Opponent Rating Result
Roger N Winterburn 114 0 - 1
Jim R Postill 105 0 - 1
Nicholas Waite 95 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-162 = (314 + 400 * (0 - 2)) / 3)

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