Event: Division 3 - Under 6400

Opponent Rating Result
Piotr Ruszelak 1784 ½ - ½
James Day 1697 0 - 1
Tom Vowler 1500 1 - 0
Piotr Ruszelak 1784 0 - 1
Jun Li Yeap 1600 0 - 1
Michael Piper 1400 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1561 = (9765 + 400 * (2 - 3)) / 6)

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