Event: June Swiss 2023 Open

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Opponent	Rating	Result
Mervyn J Hughes	1871	½ - ½
David E Hall	1911	0 - 1
Dave Dempster	1857	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1613 = (5639 + 400 * (0 - 2)) / 3)