Event: Wiseman Hurley Open 2022

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Opponent	Rating	Result
Ian Campbell	1945	0 - 1
John Pickering	0	1 - 0
Tom EC Webb	1680	½ - ½
James N Hawkins	1870	½ - ½
Keeghan McGarry	1431	½ - ½
Peter Mellor	1637	1 - 0
Roger G Williamson	2235	0 - 1

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

1543 = (10798 + 400 * (2 - 2)) / 7)