Event: Norfolk County Chess Championships- Challengers

Opponent Rating Result
David C May 1493 1 - 0
Armando Galletti 1675 ½ - ½
Bharath Klass 1600 0 - 1
Andrew Duffell 1581 0 - 1
Peter Stone 1335 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1457 = (7684 + 400 * (1 - 2)) / 5)

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