Event: Lewisham Summer Cup

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Opponent	Rating	Result
David M Rogers	1672	1 - 0
David E Brown	1822	0 - 1
James R Barber	1326	½ - ½

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

1607 = (4820 + 400 * (1 - 1)) / 3)