Event: Ringwood Rapidplay Open

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Opponent	Rating	Result
Michael FG Duggan	2172	0 - 1
Nicholas S Lee	2050	1 - 0
John P Weatherlake	2043	0 - 1
Richard W Ursell	1783	0 - 1
Stephen M Pollyn	1766	½ - ½
Adam R Ursell	1706	0 - 1

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

1720 = (11520 + 400 * (1 - 4)) / 6)