Event: North Norfolk Rapidplay (25|10)

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Opponent Rating Result
David P Jones 1345 1 - 0
David P Jones 1345 1 - 0
Adam Blackbourn 1489 1 - 0
Adam Blackbourn 1489 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1717 = (5668 + 400 * (3 - 0)) / 4)

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