Event: Worcestershire Challengers' League

Opponent Rating Result
Gavin Cartwright 1846 0 - 1
John Chester 1709 0 - 1
Mark Bethel 1810 1 - 0
John Chester 1709 ½ - ½
Rob Sutton 1687 ½ - ½
John H Loynes 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1327 = (8761 + 400 * (1 - 3)) / 6)

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