Event: UK Chess Challenge - Stockton Heath

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Opponent	Rating	Result
Xander Hall	804	0 - 1
Cheryl Liu	0	0 - 1
Joshua Lam	594	0 - 1

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

66 = (1398 + 400 * (0 - 3)) / 3)