Event: NSDCA Division 1

Opponent Rating Result
Philip J Cattermole 1794 0 - 1
David I Hulme 1803 0 - 1
Harry Gardiner 1889 1 - 0
Carmel J Barwick 1630 0 - 1
James Richard Hanlon 1600 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1663 = (8716 + 400 * (2 - 3)) / 5)

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