Event: Silver Rook

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Opponent Rating Result
Neil R Lowther 153 ½ - ½
Chris J Terrington 113 0 - 1
Dale H Cullum 113 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-7 = (379 + 400 * (0 - 1)) / 3)

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