Event: Grand Prix S7

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Opponent Rating Result
S Ali Arshad 1167 ½ - ½
David E Shiers 1649 0 - 1
Owen Frodsham 1050 0 - 1
David Millington 1627 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1273 = (5493 + 400 * (1 - 2)) / 4)

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