Event: A Division

Opponent Rating Result
Austin C Elliott 1918 ½ - ½
Christopher Hodgson 1736 ½ - ½
Borja Diaz-Guardamino 1660 1 - 0
Andy Laurence Coe 1781 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1874 = (7095 + 400 * (1 - 0)) / 4)

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