Event: June Swiss 2023 Open

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Opponent Rating Result
Andrew D Hartland 1886 1 - 0
David J Payne 1759 0 - 1
Philip R Bonafont 2097 0 - 1
Mervyn J Hughes 1871 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1703 = (7613 + 400 * (1 - 3)) / 4)

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