Event: Div 2 - Weston Trophy

Opponent Rating Result
Marek Gajdosz 2012 0 - 1
Chris G Willey 1758 ½ - ½
Andrew Birtwhistle 1781 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1584 = (5551 + 400 * (0 - 2)) / 3)

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