Event: Examiner League

Opponent Rating Result
Colin Frank 1700 1 - 0
Robert Mitchell 1659 0 - 1
Dave Colledge 1784 ½ - ½
Nigel R Hepworth 1716 0 - 1
Dave Colledge 1784 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1729 = (8643 + 400 * (2 - 2)) / 5)

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