Event: Norfolk County Chess Championships- Challengers

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Opponent Rating Result
Joseph Grant 1620 ½ - ½
Andrew Duffell 1591 0 - 1
Colin R Payne 1641 0 - 1
Mark Philip Baldock 1468 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1380 = (6320 + 400 * (0 - 2)) / 4)

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