Event: Billingham Synthonia Chess Club Championship 2023-24

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Opponent	Rating	Result
Sean Cooke	959	1 - 0
John S Garnett	1963	0 - 1
Paul Scott	1000	1 - 0
Andrew Herrity	1000	0 - 1
Stephen J jnr Roe	1708

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

1231 = (4922 + 400 * (2 - 2)) / 4)