Event: Thornaby Junior Chess Open Under 11

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Opponent	Rating	Result
Oscar Metcalfe	0	1 - 0
Freya Hind	843	1 - 0
Tashil Lankapura	1467	0 - 1
Marco Balocco	678	1 - 0
Shadrach Moukoko	0	1 - 0

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

838 = (2988 + 400 * (4 - 1)) / 5)