Event: Ilkley - Silver King

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Opponent Rating Result
Patrick Ryan 0 0 - 1
Stuart M Johnson 1528 0 - 1
Peter D Ward 1568 1 - 0
Trevor Murch 1777 1 - 0
Bill Tait 1653 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1305 = (6526 + 400 * (2 - 2)) / 5)

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