Event: Ilkley - Silver King

Opponent Rating Result
John Cleland 1584 0 - 1
Peter D Ward 1568 ½ - ½
Robert Dennington 1634 1 - 0
Bill Tait 1653 ½ - ½
Stuart M Johnson 1528 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1593 = (7967 + 400 * (1 - 1)) / 5)

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