Event: Watkinson League

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Opponent Rating Result
Peter Shaw 196 ½ - ½
Matthew Parsons 196 0 - 1
Chris R Tinker 131 ½ - ½
Matthew Parsons 196 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

80 = (719 + 400 * (0 - 1)) / 4)

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