Event: Division B

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Opponent Rating Result
Peter J Hargreaves 150 0 - 1
Robert Grounds 150 1 - 0
Robert Grounds 150 0 - 1
Brian Davies 84 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-67 = (534 + 400 * (1 - 3)) / 4)

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