Event: Summer League Division 2

Opponent Rating Result
Ken A McIntosh 1810 0 - 1
Barry Williams 1591 ½ - ½
Steve J Gibbs 1752 0 - 1
Mark Watson 1430 1 - 0
Damien Gwatkin 1506 1 - 0
Peter Cooper 1609 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1550 = (9698 + 400 * (2 - 3)) / 6)

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