Event: Open

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Opponent	Rating	Result
Chris Chadwick	165	1 - 0
Simon C Smith	160	½ - ½
Dave M Davies	154	1 - 0
Gordon SG Christie	145	1 - 0
Chris Chadwick	165	½ - ½
Simon C Smith	160	1 - 0
Dave M Davies	154	1 - 0
Gordon SG Christie	145	0 - 1

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

356 = (1248 + 400 * (5 - 1)) / 8)