Event: A Division

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Opponent Rating Result
David Wise 2050 0 - 1
Stephen Rodgers 1677 0 - 1
Ray Honeybourne 1706 ½ - ½
Nikhil Bhandari 1707 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1585 = (7140 + 400 * (0 - 2)) / 4)

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