Event: Winter Blitz

Opponent Rating Result
Daniel R Hedges 0 1 - 0
Cristina Casti 0 0 - 1
Carl Purkiss 0 0 - 1
Heather Enid Walker 0 0 - 1
Martin G Walker 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-240 = (0 + 400 * (1 - 4)) / 5)

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