Event: Grand Prix S10

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Opponent Rating Result
David E Shiers 1649 0 - 1
Howard Spencer 850 1 - 0
Joseph P Alcock 1558 1 - 0
David Millington 1627 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1421 = (5684 + 400 * (2 - 2)) / 4)

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