Event: Ilkley - Silver King

Opponent Rating Result
David W Adam 1784 1 - 0
Gerard P Killoran 1993 0 - 1
William Boothman 1768 ½ - ½
Patrick Ryan 1721 0 - 1
Robert Dennington 1634 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1700 = (8900 + 400 * (1 - 2)) / 5)

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