Event: Division 2

Opponent Rating Result
Dave Sykes 1563 1 - 0
Karim Khan 151 0 - 1
Colin S Procter 1794 1 - 0
Paul G Day 1725 ½ - ½
Les Johnson 1668 1 - 0
Paul Greenwood 1480 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1597 = (8381 + 400 * (4 - 1)) / 6)

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