Event: Lewisham Club Championship

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Opponent	Rating	Result
Norman Cho	1250	1 - 0
Mike Roberts	2080	0 - 1
Rod Wigbout	1935	½ - ½
David C Helsby	1797	1 - 0

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

1866 = (7062 + 400 * (2 - 1)) / 4)