From Magicpedia, the free online encyclopedia for magicians by magicians.
Duplicount allows you to count four cards as four and yet only showing one card (like the Flustration Count). Published by Gordon Bruce in Pabular Volume 5 No. 5 (May 1979).
It relies on a smooth rhythm to be deceptive and the illusion it creates is similar to Jean Pierre Valarino’s Rhumba Count.