digit by dekel

DIGIT by DekEl with Kenton Knepper, is both an effect you will perform right away, and a principle you will apply to countless effects.
"This is an ingenious principle that is entirely reliable and realistic. Everyone needs this because it is simple, direct, and completely impromptu. Just the sort of thing mentalists want to blow people away anytime, one on one or in a group, with no real effort and entirely off-the-cuff without preparation. This is one of those things that mentalists will be relying upon for a very long time...and those first to get it will be on the cutting edge of our future foundation of methods. That said, it is incredibly simple and easy, with only a few trials with friends needed as practice to learn."
— Kenton Knepper
Main Effect:
A spectator holds a number of fingers behind their back, and the mentalist does likewise. The spectator is to hold out as many fingers as their number when they hear it called out, but to keep that number hidden at all times. Naturally, the mentalist brings out his hand and is showing the same number of fingers held up as the spectator is holding behind their back.
A variation is when the mentalist plays "Rock, Paper, Scissors" and always wins...with the spectator hiding their choice behind their back!
That's right, a spectator can hold any number of fingers behind their back, or do Rock, Paper, Scissors, and the mentalist will ALWAYS KNOW.
Now, that's just for starters. Before we tell you what else you can do with DIGIT, let's get a few things out of the way first.
NO Secret Helpers
NO Prompting
NO Peeking of the Fingers
NO Reflections or Mirrors of Any Kind
NO Dual Reality
Nothing Written
NO Set-Up
NO Pre-show
NO Gimmicks
ENTIRELY IMPROMPTU
EVERYONE, including the spectator, is fooled.
There are many stunning applications of this secret principle once you learn it.