Event: North Norfolk Championship (85|10)

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Opponent Rating Result
Michael J Gibbons 1871 ½ - ½
Adam Blackbourn 1595 ½ - ½
Robin Blackwell 1860 0 - 1
Richie Allen 1406 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1683 = (6732 + 400 * (1 - 1)) / 4)

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