Event: A Division

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Opponent Rating Result
Alexander Longson 2119 ½ - ½
Alan J Walton 2112 ½ - ½
Simon J Taylor 1790 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2140 = (6021 + 400 * (1 - 0)) / 3)

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