Event: Worcestershire Challengers' League

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Opponent	Rating	Result
Seamus Flynn	0	0 - 1
Paul B Sharratt	1794	0 - 1
Paul B Sharratt	1794	0 - 1
Jamie Steward	1592	½ - ½
Robert (Bob) Carter	1403	1 - 0
James Allsopp	1491	1 - 0
Paul Furniss	1645	0 - 1

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

1274 = (9719 + 400 * (2 - 4)) / 7)