Event: Open County Championship

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Opponent	Rating	Result
Timothy Lunn	2028	0 - 1
Ruben Nangalia Evans	1994	0 - 1
Graham E Borrowdale	2011	½ - ½
Simon Wilks	1926	1 - 0
Paul R Kemp	2021	1 - 0
Thomas P O'Brien	2133	½ - ½

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

2019 = (12113 + 400 * (2 - 2)) / 6)