Event: Billingham Synthonia November 2022 Rapid

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Opponent	Rating	Result
Darren John Donnison	1577	0 - 1
Bernie Callaghan	1615	0 - 1

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

1196 = (3192 + 400 * (0 - 2)) / 2)