Exhibits

Look what turned up.

The archive keeps every shuffle so it can say whether one ever repeats. Kept whole, it can also say which shuffles were remarkable. Each room here ranks the whole archive on a single quantity with an exact, citable probability. Nothing is combined into a score, because a score would have to hedge and these numbers do not.

Nobody competes here and every outcome is chance, so there are no winners and no scores. There is only what the archive noticed while it was looking for something else: two shuffles that opened the same way, a royal flush sitting on top of a deck, a run of one color that refused to end, a deck that barely left the factory. Every entry links to its permanent record.

9 cards

The record shared opening. 6,945 pairs on record.

Closest calls →

Pairs of recorded shuffles that opened with the same six or more cards in the same order. Two random decks share six opening cards once in 14.7 billion pairs.

Rarest hands.

Rarest hands →

Recorded shuffles whose top five cards made four of a kind, a straight flush or a royal flush. One deck in 3,914 opens that strongly, of all possible decks.

Longest runs.

Longest runs →

Recorded shuffles with an unbroken run of fifteen or more red or black cards. About one deck in 10,769 has a run that long, of all possible decks.

Factory floor.

Factory floor →

Recorded shuffles in which eight or more cards sit exactly where a new deck has them. About one deck in 97,569 keeps that many in place, of all possible decks.

Probabilities on these pages describe the uniform random permutation, the model a perfect shuffle converges to, and are computed exactly from the counts on the methodology page. Entry counts are live and change as the archive grows. Three rooms rank single decks; closest calls is about pairs.