Exhibit

Longest runs.

Look down a shuffled deck for the longest stretch of a single color. Usually it is five or six cards. This room holds the shuffles where it reached fifteen or more.

What is ranked

The longest run of consecutive cards of the same color, red or black, anywhere in the 52-card order. Ties are ordered by archive number, oldest first.

How rare

Of all possible decks, about one in 10,769 contains a run of 15 or more. The exact distribution comes from a dynamic program over every arrangement of 26 red and 26 black cards.

The record

20 red

Shuffle #8,262,620, recorded August 4, 2025. 1,325 shuffles have qualified so far.

RankShuffleRun lengthShuffledEra
1,301#13,730,05415 redSeptember 13, 2026this site
1,302#13,731,83315 blackSeptember 13, 2026this site
1,303#13,732,23015 redSeptember 13, 2026this site
1,304#13,744,15015 redSeptember 14, 2026this site
1,305#13,761,13115 blackSeptember 14, 2026this site
1,306#13,774,68515 blackSeptember 14, 2026this site
1,307#13,853,37815 redSeptember 15, 2026this site
1,308#13,917,53515 redSeptember 16, 2026this site
1,309#13,954,86515 blackSeptember 16, 2026this site
1,310#13,972,92715 blackSeptember 16, 2026this site
1,311#13,977,93115 redSeptember 16, 2026this site
1,312#13,979,27615 blackSeptember 16, 2026this site
1,313#13,995,78115 redSeptember 16, 2026this site
1,314#14,008,82815 redSeptember 17, 2026this site
1,315#14,032,33315 redSeptember 17, 2026this site
1,316#14,046,20515 redSeptember 17, 2026this site
1,317#14,143,65415 blackSeptember 18, 2026this site
1,318#14,150,60515 blackSeptember 18, 2026this site
1,319#14,169,20915 blackSeptember 18, 2026this site
1,320#14,171,28515 redSeptember 18, 2026this site
1,321#14,228,24715 blackSeptember 19, 2026this site
1,322#14,238,86615 redSeptember 19, 2026this site
1,323#14,257,71615 redSeptember 20, 2026this site
1,324#14,290,59215 blackSeptember 20, 2026this site
1,325#14,296,72115 blackSeptember 20, 2026this site

A run this long is not a sign of a bad shuffle. The GSR model page explains why a well-mixed deck still produces streaks, and how often.