Event: D&DCL Div 2

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Opponent Rating Result
David Smith 1848 0 - 1
Kevin J Dalley 1928 0 - 1
Paul Kelman 1608 ½ - ½
David Hatton 1553 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1634 = (6937 + 400 * (1 - 2)) / 4)

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