Event: North Norfolk Championship (85|10)

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Opponent Rating Result
David P Jones 1365 1 - 0
Edward Hackford 1620 0 - 1
Alan F Page 1759 ½ - ½
Richie Allen 1410 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1639 = (6154 + 400 * (2 - 1)) / 4)

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