Event: Worcestershire Challengers' League

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Opponent	Rating	Result
Nigel S Towers	1845	0 - 1
Seamus Flynn	0	1 - 0
David Cleak	1531	1 - 0
Andy Tipper	1379	0 - 1
Terrance Pountney	1408	½ - ½
Cameron Henry	1163	1 - 0
James Allsopp	1491	0 - 1
James Allsopp	1491	1 - 0

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

1339 = (10308 + 400 * (4 - 3)) / 8)