Event: Division 4

Opponent Rating Result
David M Cotterell 1537 0 - 1
Toby Smith 0 0 - 1
Roy G Watson 1586 1 - 0
David Collinson 1291 0 - 1
Roger Ball 1483 0 - 1
David Collinson 1282 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

930 = (7179 + 400 * (1 - 5)) / 6)

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