Event: Div 2 - Weston Trophy

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Opponent Rating Result
Peter J Hoare 1665 0 - 1
David Watson 1721 1 - 0
Mithun Chakravorty 0 0 - 1
Phil Griffiths 1837 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1106 = (5223 + 400 * (1 - 3)) / 4)

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