Event: A Division

Opponent Rating Result
Dave Toole 1901 0 - 1
Amy Lovatt 1831 ½ - ½
Andy Laurence Coe 1796 0 - 1
John Robinson 1883 0 - 1
Andrew Lewis 1933 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1709 = (9344 + 400 * (1 - 3)) / 5)

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