Event: Maidstone Club Championship (22/23)

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Opponent	Rating	Result
Chris V Barton	1622	1 - 0
Petko Kunev	1552	0 - 1
Robert Mason	1300	½ - ½

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

1491 = (4474 + 400 * (1 - 1)) / 3)