Event: calderdale 30

Opponent Rating Result
Barry Wadsworth 0 ½ - ½
David Shapland 0 0 - 1
Jeremy Butts 0 1 - 0
Sam B Swain 0 ½ - ½
Robert Mitchell 0 1 - 0
David A Patrick 0 0 - 1
Vivien Webster 0 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

0 = (0 + 400 * (2 - 2)) / 7)

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