Event: UK Chess Challenge - Stockton Heath

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Opponent	Rating	Result
Hayden Lo	0	0 - 1
Jamson Cheng	0	1 - 0
Jan Machnio	585	1 - 0
Yui Hang Tsang	870	0 - 1
Oliver Houghton	832	0 - 1

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

377 = (2287 + 400 * (2 - 3)) / 5)