Event: Cornwall Quickplay League 2023

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Opponent	Rating	Result
Peter Doubleday	1498	0 - 1
Peter Doubleday	1498	1 - 0
Ian M George	1933	0 - 1
Ian M George	1933	0 - 1

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

1516 = (6862 + 400 * (1 - 3)) / 4)