Event: Worcestershire Challengers' League

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Opponent	Rating	Result
Chris Lee	1612	1 - 0
Andrew S Whitten	1657	1 - 0
Scott Oxtoby	1651	½ - ½
Andrew S Whitten	1657	½ - ½
Paul B Sharratt	1729	½ - ½
Eric Horwill	1637	1 - 0
Steve Crees	1726	0 - 1

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

1781 = (11669 + 400 * (3 - 1)) / 7)