Event: RAPID

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Opponent Rating Result
David Wallis 0 ½ - ½
David Wallis 0 1 - 0
Keith Guinness 0 1 - 0
David Bradley 0 1 - 0
David Wallis 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

320 = (0 + 400 * (4 - 0)) / 5)

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