Event: Silver Rook

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Opponent Rating Result
Chris Roche 120 1 - 0
John K Holliday 139 0 - 1
Ben Emmerson 109 0 - 1
Dave Young 79 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

12 = (447 + 400 * (1 - 2)) / 4)

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