Thanks To Gardner…

A Martin Gardner idea.

Take a shuffled deck of cards. And then take another deck of cards and arrange it so that it’s order is the reverse of the first deck. Riffle shuffle the two decks together and cut exactly in half (ie at the 52nd card).

You now have two complete decks of cards.

Is there a trick in this?


5 Responses to Thanks To Gardner…

  1. KiKeNiCo says:

    Gilbreath anyone?

  2. cardmagic10 says:

    Of course this is The Gilbreath Principle.

    I was hoping that this would go without saying – but maybe you are right and I should be clearer…

    Anyway – to me this particular use for it seems more elegant (and intriguing) than the usual red/black/red/black type effects. There is something about shuffling two compete decks together and still ending with two complete decks which seems like it could make for an interesting effect. It will take a more creative guy than me to figure out how though…

    I am fascinated by this principle. I may post some more on it in the future. But – off the top of my head I would recommend GAME LAW by Roy Walton. It is in the second volume of THE COMPLETE WALTON. What is cool about this effect is that the spectator can give the deck TWO riffle shuffles. I have never seen that before in this type of effect…

    Karl Fulves also claims ownership of this principle. He talks about how he discovered it in a great little book called ORIGINS. He was imagining analogies for sexual reproduction in playing cards and stumbled across this idea. It makes for fascinating reading. I believe he was only a teenager when he was thinking along these lines…

    I should add as well that this principle (in a non-riffle form) was used in a gambling effect by Rusduck. It is in one of the early issues of THE CARDISTE magazine and it preceded Norman Gilbreath’s work in this area…

    Rusduck also discovered the STAY STACK principle. So – he is obviously a talented creator. It is interesting since I often picture the STAY STACK principle as being an adaptation of the Gilbreath Principle. For instance imagine a Gilbreath effect in which the riffle shuffle given the cards was a perfect riffle shuffle. Aka – a faro shuffle. Aka – the STAY STACK principle.

    One last point. Alex Elmsley also discovered the STAY STACK principle (apparently before Rusduck) – but Rusduck published his results before Elmsley. A pertinent reminder of Elmsley’s astonishing genius…

  3. Paul Gordon says:

    This is NOT a plug (because the book is now out of print), but a few years ago I republished Rusduck’s The Cardiste in book form; this was the first time the book had appeared in proper hardcopy format. Anyway…

    The stuff in there is that of GENIUS. Killer material

  4. Cardman says:

    I think your response is the best anyone could state. A two spectator coincidence type thing etc.

    It might be helpful to think in a manner like “A Straight Shuffle”. I can’t see much in 104 being exciting, but dealing with a small sum concentrated could have merits. Does it give a higher impact though? I guess that’s the real debate. Fun to goof with though.

  5. Cardman says:

    I just remembered a Stewart James/Maven thing. You could use “halves of words” written on the cards. This would only be proper for a large audience. It’s not the most mind numbing answer by any means.

    Alas. I felt the need to give at least one fresh thought to the idea on your blogosphere.

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