Event: Thornaby Junior Chess Open Under 11

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Opponent	Rating	Result
Marco Balocco	678	0 - 1
Mehek Malik	0	1 - 0
Ben Pearson	0	1 - 0
Tashil Lankapura	1467	0 - 1
Oscar Metcalfe	0	1 - 0

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

509 = (2145 + 400 * (3 - 2)) / 5)