Event: Worcestershire Challengers' League

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Opponent	Rating	Result
Robert (Bob) Carter	1403	0 - 1
Robert (Bob) Carter	1403	½ - ½
Paul Furniss	1645	1 - 0
Ian M Truscott	1646	1 - 0
Colin G Vernon	1387	0 - 1
Aiden Griffiths	1453	1 - 0
Cameron Henry	1163	1 - 0
Luke Barton	0	0 - 1
Eric Horwill	1734	1 - 0
Eric Horwill	1734	0 - 1

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

1397 = (13568 + 400 * (5 - 4)) / 10)