Event: Division 1

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Opponent Rating Result
Yaroslav Orishko 2024 0 - 1
Stephen J Gregory 2100 ½ - ½
Yaroslav Orishko 2000 0 - 1
Andrew J Donnelly 1828 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1688 = (7952 + 400 * (0 - 3)) / 4)

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