Event: Ilkley - Silver King

Opponent Rating Result
Robert Dennington 1601 ½ - ½
Bill Tait 1653 1 - 0
Stuart M Johnson 1528 ½ - ½
William Boothman 1768 ½ - ½
Gerard P Killoran 1993 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1789 = (8543 + 400 * (1 - 0)) / 5)

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