# What is the best way to shuffle a large deck without damaging the cards?

I'm quite familiar with a few methods of cards, primarily Riffling and Mongean* shuffling. The issue I have with those is that the Riffling shuffle tends to bend cards and wear them out, as well as not working well with a large deck. The Mongean method isn't particularly good at shuffling large decks either.

Unlike this thread I'm not dealing with a well organised deck, but I am dealing with a large deck (80 cards plus).

I've considered cutting the deck in two first, but that then takes twice as long.

What is the best method for shuffling in this case?

*Instead of moving one card at a time, I move a random number.

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I'm going to create shuffling for this question because I think shuffling is an important enough topic to have its own tag. – Gordon Gustafson Dec 27 '11 at 19:50
I was going to add it myself but I was lacking in rep... – Pureferret Dec 28 '11 at 12:33
possible duplicate of What is a safe and accurate technique for shuffling cards? – Dave DuPlantis Dec 28 '11 at 18:24
@DaveDuPlantis I don't think it addresses shuffling large decks, thanks for pointing that out though. – Pureferret Dec 28 '11 at 19:45

With the implied restriction on time combined with the explicit restriction to keep the cards pristine, I'd suggest using extra space to shuffle. Here's what I do with large decks of cards:

1. Divide the large deck into several smaller piles. For 80 cards, I'd make about 8 piles of 7-15 cards
2. Select two piles at random and combine them using a hindu shuffle (unlike in the video, when I do it, I do it by grasping the wider-side rather than the narrower side of the cards for better control of larger decks.
3. After a few shuffles, grab another random pile and add it to the deck
4. Continue until all decks have been added.
5. Continue with several more Hindu shuffles until you're satisfied.

If you cannot keep all cards in your hand, recombine/shuffle half the cards, then recombine/shuffle the other half, put the two halves together (just stacking them) into 1 full deck again. Finally, repeat the entire process two or three times (this is only necessary if you had to do a simple stacking).

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How long does this technique take normally? – Pureferret Dec 31 '11 at 15:19
I just did it last night for a stack of about 150 cards and it took about 90 seconds. – Neal Tibrewala Jan 1 '12 at 0:11

I just alternate between stack shuffling, hindu shuffling, and standard shuffling. If I'm bored then I throw the cards in the air and then pick them up.

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That's great, but without any justification it's not really much of an answer, is it? Can you expand on this at all? – ire_and_curses Oct 10 '13 at 16:15