Event: Worcestershire Challengers' League

Opponent Rating Result
Gavin Cartwright 1849 0 - 1
Scott Oxtoby 1651 0 - 1
Scott Russell 1769 ½ - ½
John Chester 1709 0 - 1
Phil Maddocks 1782 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1432 = (8760 + 400 * (0 - 4)) / 5)

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