Event: Open

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Opponent Rating Result
Larry E Marden 0 ½ - ½
Mark Davey 0 ½ - ½
Martyn Hamer 2050 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

683 = (2050 + 400 * (0 - 0)) / 3)

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