Event: A Division

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Opponent Rating Result
John Robinson 1907 0 - 1
Kelechukwu Nkwonta 1883 ½ - ½
David Boulden 1712 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1834 = (5502 + 400 * (1 - 1)) / 3)

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