Event: Norfolk County Chess Championships- Challengers

Opponent Rating Result
Andrew Duffell 1591 1 - 0
Joseph Grant 1620 0 - 1
Chris Perkins 1659 ½ - ½
Alex Wheeler 1419 0 - 1
Larysa Klepikovska 1506 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1559 = (7795 + 400 * (2 - 2)) / 5)

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