ok this is what i think
the blue deck has a stack of the 13 cards of 1 suit in order at the very top
the deck is spread out with the bottom chuck real close and the top section spread out really wide makin it an obvious choice to pick from......now the tricky bit is finding out the card that was actually chosen and i think it could be done usein a glimpse....that bit i havent quite figured out yet.....then the red deck is set up similar only i would say its a reverse order of what the blue deck is in......it more likely that they pick furth from the top so they are more likely to pick a card above 5....i hope that makes sense to u.....but then from the red deck, u could then be able ot take the relevant card from the red deck and it will match