Event: Silver Rook

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Opponent Rating Result
Peter Cooper 150 1 - 0
Sara Hussain 97 1 - 0
Jonathan Moreton 112 0 - 1
Peter Cooper 150 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

227 = (509 + 400 * (2 - 1)) / 4)

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