Event: Harrogate Evening League 2019-20

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Opponent	Rating	Result
Steven Revell	158	1 - 0
Andrew Zigmond	123	1 - 0
Chris Tatham	123	½ - ½

performance = (sum(opponents ratings) + 400(wins-losses)) / games

401 = (404 + 400 * (2 - 0)) / 3)