Event: Worcestershire Challengers' League

Opponent Rating Result
Ray A Collett 1854 ½ - ½
Phil Austin 1734 ½ - ½
Nigel S Towers 1807 0 - 1
Joshua Clarke 1755 0 - 1
Ben Attwell 0 0 - 1
Stephen V Woodhouse 1888 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1373 = (9038 + 400 * (1 - 3)) / 6)

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