Having seen Steve Beam and Joel Givens use Beam's overhand-style "Underhand Shuffle", I gotta say that it would definitely fool the spectator. What I like is its versatility to accomplish a variety of placements.
I'm still not sure which SEMI-AUTOMATIC book he published some of the work on this in but this is Beam's ad for the seperate booklet from http://www.mindspring.com/~sbeam/home.html
"The Underhand Shuffle – (NEW!)
Written and illustrated by Steve Beam
Softbound – 24 pages
This is the ultimate full-deck false overhand shuffle. It is disarmingly convincing and amazingly versatile. In addition to the basic full-deck shuffle, specific use shuffles are described for replacing the double undercut, as well as retaining the center, top, and bottom stocks. You will also find included the best red/black retention shuffle available for those using Out of This World variations.
Finally, the centerpiece of the manuscript is a spectator-fooling, magician drooling multiple location which rivals Multiple Impact for full contact audience devastation.
Each of three to five spectators cuts to his own selection, then fully shuffles the cards before returning the pack to the magician. In a sure-fire comedic killer, the magician nails all of them. Suitable for platform or close-up…………………..$15.
(Note: Some of the ideas in this manuscript have been published in the Semi-Automatic Card Trick series.)"
Joel was also working on the Heinstein Shuffle. It's difficult but it sure looks like a real shuffle and cascade. Definitely worth the effort.
And by the way, Harold, there was a long discussion here of Karl's shuffle in Magicana starting 7/30/01, including tips from Karl himself. Try: http://geniimagazine.com/forum/cgi-bin/ ... 3&t=000003