Event: BSE Jnr Congress u13

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Opponent	Rating	Result
Callum Garrett	967	0 - 1
Philip Kapushesky	0	1 - 0
Vicktor Starodubcevs-Snaiders	1100	0 - 1
Freddie Jacobs	800	1 - 0
Vassily M Sagyaman	1521	0 - 1
Samuel Ghali	1013	1 - 0

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

900 = (5401 + 400 * (3 - 3)) / 6)