Behind My Back was originally published back in 2014 and since then it has undergone quite a few changes making it more easy, effective and streamlined.
Here is how it looks now:
With the performer’s back turned towards the participant, he/she selects a few cards.
The participant discards one of the cards.
Now the performer correctly deduces the number of red and black cards, high and low cards among the ones that remain.
The participant further discards some of the cards and the performer once again correctly deduces the sum of the values of cards in the participant’s hand.
Moving on to correctly naming the cards and finishing off with naming the one card that was discarded in the beginning.