Event: Division 3

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Opponent Rating Result
Mike J Groombridge 1640 1 - 0
Roger Bray 1534 1 - 0
Peter J R Oliver 1560 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1711 = (4734 + 400 * (2 - 1)) / 3)

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