Event: Holmfirth Junior Rapid

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Opponent	Rating	Result
Lily Booth	1043	0 - 1
Jamie Booth	593	½ - ½
Leo Hirst	778	0 - 1

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

538 = (2414 + 400 * (0 - 2)) / 3)