Event: Harrogate Evening League 2018-19

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Opponent Rating Result
John Swiers 95 ½ - ½
Chris Tatham 123 0 - 1
Andrew Zigmond 129 1 - 0
David Webster 43 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

198 = (390 + 400 * (2 - 1)) / 4)

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