In Charles Jordan’s Best Card Tricks by Fulves, Long Dostance Mind Reading is a part of the chapter on Shuffle Systems. I love it and have started using it via text. Instead of sending half the deck back the just spread face up and text me. A couple minutes later I send the reveal. Question is the book states that on occasion if the selection is from the end of a chain you will only know the selection is the highest or lowest in a suite/chain set. With a full deck how often will that happen? Anyone point me in the right direction? Thanks.

I’m sorry that I’m not responding to your question, but this trick intrigues me and I am considering buying the book after reading the description on it. Would you recommend it?
Thanks for the feedback

With regards
AlxRosekoski

Bayer and Diaconis say 84% with 3 shuffles in their paper "Trailing the Dovetail Shuffle to its Lair." Ann. Appl. Probab. 2 (2) 294 - 313, May, 1992. They also discuss probabilities for more shuffles and / or more guesses (e.g., 1 guess, 2 shuffles is 99.7%, 2 guesses is 94% with 3 shuffles). I vaguely recall discussion elsewhere in this forum that you can improve the probability based on when in the process you have the card chosen.

In practice, I prefer the 2 shuffle, half-deck version because it is faster to do.