Event: SCCU County Championship: u1850

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Opponent	Rating	Result
Tony B Packham	1755	0 - 1
David Helps	1699	1 - 0
Charlie Cooke	1684	0 - 1

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

1579 = (5138 + 400 * (1 - 2)) / 3)