Event: Silver Rook

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Opponent Rating Result
Chris J Terrington 126 ½ - ½
W Lilburn-Quick 0 1 - 0
Jim R Postill 110 0 - 1
Chris Roche 120 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

89 = (356 + 400 * (1 - 1)) / 4)

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