Event: Division 2

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Opponent Rating Result
Artur Mieczkowski 128 1 - 0
Paul N Kington 145 ½ - ½
Robert W Counsell 123 0 - 1
Jacob R Wynn 113 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

127 = (509 + 400 * (1 - 1)) / 4)

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