Event: Harrogate Evening League 2018-19

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Opponent	Rating	Result
Andrew Zigmond	129	1 - 0
Matt Harris	0	½ - ½
Steven Revell	150	0 - 1
Martin Hawkins	0	1 - 0

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

170 = (279 + 400 * (2 - 1)) / 4)