Event: Division 2

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Opponent Rating Result
Peter J R Oliver 1560 0 - 1
David W Fone 1609 0 - 1
Philip Sykes 1574 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1448 = (4743 + 400 * (1 - 2)) / 3)

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