David 's cards trick...  (1)    

I'm going to show you four cards, and you're going to choose one.
Make sure you remember it !
Then I will add more cards and you will take 4 steps for example : you can only move vertically and/or horizontally.
It can be 3 steps vertically and 1 step horizontally.
There are many possibilities.
Click here to get an example.  
(A horse can be seen on the back of the cards)

    Then I will turn over one of the cards where you're not standing
and finally I will find out where you are !

 

 

(1) These cards come from a game showing fashion plates.
It was published in Paris circa 1850 by the fashion newspaper "Le Caméléon" .
The original can be found at La Bibliothèque Nationale, Paris.

I didn't find you where
I just turned one or
a few cards over...