Event: Division 1

Opponent Rating Result
Christopher S Dossett 163 ½ - ½
Paul M Barber 162 0 - 1
Steve Whitehead 143 1 - 0
Simon Chester 142 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

153 = (610 + 400 * (1 - 1)) / 4)

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