Event: Division 3

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Opponent Rating Result
Edward Hargreaves 1576 1 - 0
Dave Mellon 1528 ½ - ½
Helen M Frostick 1714 ½ - ½
David Carpenter 1690 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1827 = (6508 + 400 * (2 - 0)) / 4)

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