Event: Silver Rook

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Opponent Rating Result
Richard White 109 1 - 0
Sara Hussain 107 1 - 0
Mark Shelmerdine 127 1 - 0
Alan S Metcalfe 127 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

518 = (470 + 400 * (4 - 0)) / 4)

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