Event: Silver Rook

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Opponent Rating Result
Margaret Rowley 94 ½ - ½
Matthew Edwards 92 ½ - ½
Alan J Smith 142 0 - 1
Barry Fulthorpe 78 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2 = (406 + 400 * (0 - 1)) / 4)

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