Event: Open

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Opponent	Rating	Result
Marek J Soszynski	149	1 - 0
Christopher D Lewis	154	0 - 1
Jonathon Vaughan	169	½ - ½
Jonathan Dale	161	0 - 1
Christopher D Lewis	154	0 - 1
Jonathon Vaughan	169	½ - ½
Jonathan Dale	161	0 - 1
Wojciech Czopek	154	0 - 1

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

-41 = (1271 + 400 * (1 - 5)) / 8)