Event: Grand Prix S2

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Opponent Rating Result
S Ali Arshad 1167 1 - 0
Charlie G Swinson 1429 ½ - ½
David Millington 1627 0 - 1
Chris Ellis 1200 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1256 = (5423 + 400 * (1 - 2)) / 4)

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