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. 1,324 shuffles have qualified so far.

RankShuffleRun lengthShuffledEra
801#5,793,63015 redJuly 6, 20252025 engine
802#5,800,18815 redJuly 6, 20252025 engine
803#5,812,03215 redJuly 7, 20252025 engine
804#5,818,62915 blackJuly 7, 20252025 engine
805#5,894,97615 blackJuly 7, 20252025 engine
806#5,917,47815 blackJuly 8, 20252025 engine
807#5,963,94715 blackJuly 8, 20252025 engine
808#5,964,70715 redJuly 8, 20252025 engine
809#5,982,18715 redJuly 9, 20252025 engine
810#5,986,48615 redJuly 9, 20252025 engine
811#5,991,63115 blackJuly 9, 20252025 engine
812#5,991,64115 redJuly 9, 20252025 engine
813#6,034,16915 blackJuly 9, 20252025 engine
814#6,079,71815 blackJuly 10, 20252025 engine
815#6,145,08915 blackJuly 10, 20252025 engine
816#6,147,10615 blackJuly 10, 20252025 engine
817#6,150,95615 redJuly 11, 20252025 engine
818#6,153,32315 blackJuly 11, 20252025 engine
819#6,224,56115 redJuly 11, 20252025 engine
820#6,257,93315 blackJuly 12, 20252025 engine
821#6,258,29815 redJuly 12, 20252025 engine
822#6,260,24615 redJuly 12, 20252025 engine
823#6,271,99315 redJuly 12, 20252025 engine
824#6,274,87715 redJuly 12, 20252025 engine
825#6,294,55115 blackJuly 12, 20252025 engine
826#6,309,95015 blackJuly 12, 20252025 engine
827#6,360,55615 blackJuly 13, 20252025 engine
828#6,364,54615 redJuly 13, 20252025 engine
829#6,401,67815 blackJuly 13, 20252025 engine
830#6,408,46815 redJuly 14, 20252025 engine
831#6,419,80215 blackJuly 14, 20252025 engine
832#6,438,12815 blackJuly 14, 20252025 engine
833#6,450,21715 blackJuly 14, 20252025 engine
834#6,458,21615 blackJuly 14, 20252025 engine
835#6,463,80415 blackJuly 14, 20252025 engine
836#6,468,07915 blackJuly 14, 20252025 engine
837#6,496,24815 blackJuly 15, 20252025 engine
838#6,516,11315 redJuly 15, 20252025 engine
839#6,534,06915 blackJuly 15, 20252025 engine
840#6,538,10115 redJuly 15, 20252025 engine
841#6,553,00615 blackJuly 15, 20252025 engine
842#6,556,59415 blackJuly 15, 20252025 engine
843#6,557,44715 blackJuly 15, 20252025 engine
844#6,574,42115 redJuly 16, 20252025 engine
845#6,582,61115 blackJuly 16, 20252025 engine
846#6,663,77415 redJuly 17, 20252025 engine
847#6,678,12615 redJuly 17, 20252025 engine
848#6,690,85315 blackJuly 17, 20252025 engine
849#6,704,63215 blackJuly 17, 20252025 engine
850#6,748,29415 blackJuly 18, 20252025 engine
851#6,758,66015 blackJuly 18, 20252025 engine
852#6,763,76015 blackJuly 18, 20252025 engine
853#6,767,54715 redJuly 18, 20252025 engine
854#6,771,02215 redJuly 18, 20252025 engine
855#6,772,76715 blackJuly 18, 20252025 engine
856#6,789,38815 blackJuly 18, 20252025 engine
857#6,799,83815 blackJuly 18, 20252025 engine
858#6,813,08115 redJuly 18, 20252025 engine
859#6,813,65615 blackJuly 18, 20252025 engine
860#6,822,83015 redJuly 18, 20252025 engine
861#6,847,09415 blackJuly 19, 20252025 engine
862#6,886,62715 blackJuly 19, 20252025 engine
863#6,901,95915 blackJuly 19, 20252025 engine
864#6,907,01515 blackJuly 19, 20252025 engine
865#6,917,66015 blackJuly 20, 20252025 engine
866#6,982,02515 blackJuly 20, 20252025 engine
867#6,992,28615 redJuly 20, 20252025 engine
868#7,018,61315 blackJuly 21, 20252025 engine
869#7,036,07015 redJuly 21, 20252025 engine
870#7,039,13215 blackJuly 21, 20252025 engine
871#7,043,08215 redJuly 21, 20252025 engine
872#7,047,88915 redJuly 21, 20252025 engine
873#7,055,87015 redJuly 21, 20252025 engine
874#7,078,47715 blackJuly 21, 20252025 engine
875#7,081,30115 redJuly 22, 20252025 engine
876#7,112,51015 redJuly 22, 20252025 engine
877#7,127,82915 redJuly 22, 20252025 engine
878#7,146,85515 redJuly 22, 20252025 engine
879#7,208,14715 redJuly 23, 20252025 engine
880#7,211,91715 redJuly 23, 20252025 engine
881#7,242,79715 redJuly 23, 20252025 engine
882#7,289,79215 blackJuly 24, 20252025 engine
883#7,305,37915 blackJuly 24, 20252025 engine
884#7,340,45415 blackJuly 25, 20252025 engine
885#7,344,45915 blackJuly 25, 20252025 engine
886#7,355,45415 blackJuly 25, 20252025 engine
887#7,374,55015 blackJuly 25, 20252025 engine
888#7,376,49315 redJuly 25, 20252025 engine
889#7,377,43615 blackJuly 25, 20252025 engine
890#7,392,81815 redJuly 25, 20252025 engine
891#7,406,68315 redJuly 25, 20252025 engine
892#7,426,91515 redJuly 26, 20252025 engine
893#7,449,42615 blackJuly 26, 20252025 engine
894#7,476,47815 blackJuly 26, 20252025 engine
895#7,483,33115 blackJuly 26, 20252025 engine
896#7,508,75015 redJuly 27, 20252025 engine
897#7,552,45315 blackJuly 27, 20252025 engine
898#7,554,43015 blackJuly 27, 20252025 engine
899#7,560,74015 redJuly 27, 20252025 engine
900#7,562,10915 blackJuly 27, 20252025 engine

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.