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RNG - Shuffling Avoids Clumps - Easily Replicated

Posted: Tue Jun 15, 2021 5:52 pm
by J01
The deck shuffler seems to avoid the same card being next to each other in the deck order.

This can be easily replicated by creating a 6 card deck with 3 copies of 2 cards and hosting a custom duel and resetting the deck order. Doing this I shuffled the deck 80 times and monitored whether the deck came out with cards next to each other or went alternately.

The cards went alternately (ABABAB or BABABA) 60/80 trials (75%), however, the odds of either ABABAB or BABABA coming up in a single trial should only be 10% ((6/6 )*(3/5 )* (2/4) *(2/3) * (1/2) * (1/1))

So you can understand what I'm talking about here is a video clip of the first few trials:
https://imgur.com/a/TgSFQDW

Re: RNG - Shuffling Avoids Clumps - Easily Replicated

Posted: Thu Sep 22, 2022 11:44 pm
by eyal282
J01 wrote:The deck shuffler seems to avoid the same card being next to each other in the deck order.

This can be easily replicated by creating a 6 card deck with 3 copies of 2 cards and hosting a custom duel and resetting the deck order. Doing this I shuffled the deck 80 times and monitored whether the deck came out with cards next to each other or went alternately.

The cards went alternately (ABABAB or BABABA) 60/80 trials (75%), however, the odds of either ABABAB or BABABA coming up in a single trial should only be 10% ((6/6 )*(3/5 )* (2/4) *(2/3) * (1/2) * (1/1))

So you can understand what I'm talking about here is a video clip of the first few trials:
https://imgur.com/a/TgSFQDW


I wonder if this issue still exists, or if it matters for a 40 card deck.