Event: Billingham Synthonia Chess Club May 2023 Rapid

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Opponent	Rating	Result
Brian Whitaker	1625	0 - 1
Matthew Tyson	1000	0 - 1
Benjmin Dodgson	1150	0 - 1

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

858 = (3775 + 400 * (0 - 3)) / 3)