Event: Harrogate Evening League 2019-20

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Opponent	Rating	Result
Chris Tatham	123	½ - ½
Mate Ther	178	0 - 1
Brian H Coop	165	0 - 1
John Grasham	139	1 - 0

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

51 = (605 + 400 * (1 - 2)) / 4)