Event: Division 1

Opponent Rating Result
Samir Cradock 1823 0 - 1
Richard Porter 1869 0 - 1
Peter D Rooney 2025 0 - 1
Paul Butterworth 1835 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1688 = (7552 + 400 * (1 - 3)) / 4)

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