Event: Durham League Division B

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Opponent	Rating	Result
Stephen J Hall	1855	0 - 1
David Lowcock	1440	0 - 1
Sam Ball	1429	0 - 1
James Clay	0	0 - 1
Ilya Bowman	1450	0 - 1

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

835 = (6174 + 400 * (0 - 5)) / 5)