Event: Group A

Opponent Rating Result
Martin G Walker 2228
Martin G Walker 2228 ½ - ½
Carl Purkiss 1577
Carl Purkiss 1577
Olly Shaw 1540
Olly Shaw 1540
Cristina Casti 1614
Cristina Casti 1614 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2121 = (3842 + 400 * (1 - 0)) / 2)

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