Event: Division 2

Opponent Rating Result
Mathew Wilson 1530 ½ - ½
Zoe Veselow 1688 1 - 0
Michael Harrison 1278 ½ - ½
Lyn Stiffell 1582 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1620 = (6078 + 400 * (1 - 0)) / 4)

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