Event: A Division

Opponent Rating Result
Liam F Rabbitte 2025 0 - 1
Marlon Espiritu 1751 ½ - ½
Chris Gallagher 1496 1 - 0
Martin Lythgoe 1890 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1791 = (7162 + 400 * (1 - 1)) / 4)

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