Event: Division 4

Opponent Rating Result
Steve Black 0 0 - 1
David Simm 0 0 - 1
Ben A Wood 0 0 - 1
Peter J Combellack 0 ½ - ½
Max Piotrowicz 0 ½ - ½
Ali Shaheed 0 1 - 0
Albert Griffiths 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-171 = (0 + 400 * (1 - 4)) / 7)

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