Event: Billingham Synthonia Chess Club Championship 2023-24

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Opponent	Rating	Result
Dermot O'Higgins	1490	0 - 1
Paul Scott	1000	0 - 1
Nicola Britton	1000	1 - 0
Derek Simpson	1459	0 - 1
Michael Joynes	1000

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

1037 = (4949 + 400 * (1 - 3)) / 4)