Event: Essex Summer Rapid Knockout

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Opponent	Rating	Result
Shrishti Shiva	1506	1 - 0
Shrishti Shiva	1506	½ - ½
Steven JL Rix	2019	½ - ½
Steven JL Rix	2019	0 - 1

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

1763 = (7050 + 400 * (1 - 1)) / 4)