Event: Open

Opponent Rating Result
Jonathan E Swindells 211 0 - 1
Donald J Mason 195 0 - 1
Simon C Smith 172 0 - 1
Jonathan E Swindells 211 0 - 1
Donald J Mason 195 ½ - ½
Simon C Smith 172 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-141 = (1156 + 400 * (0 - 5)) / 6)

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