Event: Division 3

Opponent Rating Result
Danut Joian 1835 0 - 1
Karol Grzywaczewski 1658 0 - 1
Kim T Gilbert 1586 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1560 = (5079 + 400 * (1 - 2)) / 3)

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