Event: Autumn Blitz Ladder (5|2)

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Opponent Rating Result
Robin Blackwell 0 0 - 1
Yvonne Cowan 0 1 - 0
Tony R Larner 1445 0 - 1
Alan F Page 1765 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

603 = (3210 + 400 * (1 - 3)) / 4)

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