Event: Division B

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Opponent Rating Result
Darren Pickering 1548 ½ - ½
David Tuke 1630 0 - 1
Danny Aspden 0 0 - 1
Colin Wilks 1503 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1070 = (4681 + 400 * (1 - 2)) / 4)

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