Event: Div 2 - Weston Trophy

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Opponent Rating Result
Marek Gajdosz 2012 1 - 0
Carl Walker 1927 ½ - ½
Ewan Kershaw 1991 1 - 0
David Ashcroft 1810 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2135 = (7740 + 400 * (2 - 0)) / 4)

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