Event: Open

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Opponent Rating Result
Martin P Burrows 2187 1 - 0
Andrew J Morley 2099 ½ - ½
Jack Pilley 2061 ½ - ½
Graham J Sharpe 2013 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2290 = (8360 + 400 * (2 - 0)) / 4)

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