Event: Rook 2019-20

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Opponent Rating Result
Mark Broom 200 ½ - ½
David N Roberts 170 1 - 0
Chris W Heath 154 ½ - ½
Philip M Stimpson 175 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

175 = (699 + 400 * (1 - 1)) / 4)

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