Event: Open

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Opponent	Rating	Result
Chris Chadwick	1998	½ - ½
Martin D Smyth	1975	0 - 1
Jet Ajimal	1683	1 - 0
John Lee	1646	0 - 1
Chris Chadwick	1998	0 - 1
Martin D Smyth	1975	0 - 1
Jet Ajimal	1683	1 - 0
John Lee	1646	0 - 1

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

1676 = (14604 + 400 * (2 - 5)) / 8)