Event: Open County Championship

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Opponent Rating Result
Kevin J Williamson 1881 ½ - ½
Alan Watkins 1821 ½ - ½
Richard McMorran 1688 1 - 0
Mahmoud Dairi 1301 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1873 = (6691 + 400 * (2 - 0)) / 4)

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