Event: Div 2 - Weston Trophy

Opponent Rating Result
Alan S McIntosh 1840 1 - 0
Marek Gajdosz 2012 0 - 1
Xi-Yang Guo 2113 0 - 1
Jonathan A Tait 2110 ½ - ½
Chris G Willey 1758 ½ - ½
Andrew Birtwhistle 1781 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1802 = (11614 + 400 * (1 - 3)) / 6)

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