Event: A Division

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Opponent Rating Result
Aitor Garcia-Ruiz 2059 0 - 1
Joshua Pink 2063 1 - 0
Nikolay Milchev 2241 0 - 1
Allan W Beardsworth 2268 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2158 = (8631 + 400 * (2 - 2)) / 4)

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