Event: 2021 Jamboree

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Opponent	Rating	Result
David JW Smith	1315	1 - 0
Alex Ross	0	1 - 0
Antony Austin	1345	1 - 0

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

1287 = (2660 + 400 * (3 - 0)) / 3)