Event: Worcestershire Challengers' League

Opponent Rating Result
Pierre Lipinsky 1512 0 - 1
Anthony Boyle 1605 0 - 1
Aiden Griffiths 1453 1 - 0
Aiden Griffiths 1453 0 - 1
Eric Horwill 1734 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1391 = (7757 + 400 * (1 - 3)) / 5)

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