Event: WDCL Division 2

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Opponent Rating Result
David Tomkins 1510 1 - 0
Richard Devonport 1390 0 - 1
Charles Metcalfe 1653 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1384 = (4553 + 400 * (1 - 2)) / 3)

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