Event: Division 4

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Opponent Rating Result
Roger P Newman 1450 1 - 0
Ian G Berry 1615 1 - 0
Robert S Pigeon 1510 1 - 0
Peter J Horlock 1705 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1970 = (6280 + 400 * (4 - 0)) / 4)

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