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
901#7,573,94115 blackJuly 27, 20252025 engine
902#7,579,64715 redJuly 27, 20252025 engine
903#7,593,24015 blackJuly 28, 20252025 engine
904#7,624,66615 blackJuly 28, 20252025 engine
905#7,636,41815 blackJuly 28, 20252025 engine
906#7,654,65515 redJuly 28, 20252025 engine
907#7,668,10115 redJuly 28, 20252025 engine
908#7,678,84815 redJuly 29, 20252025 engine
909#7,684,11015 blackJuly 29, 20252025 engine
910#7,692,20815 redJuly 29, 20252025 engine
911#7,706,45815 blackJuly 29, 20252025 engine
912#7,707,96815 redJuly 29, 20252025 engine
913#7,739,68315 redJuly 29, 20252025 engine
914#7,752,04815 blackJuly 29, 20252025 engine
915#7,806,17115 redJuly 30, 20252025 engine
916#7,810,22815 blackJuly 30, 20252025 engine
917#7,867,01615 redJuly 31, 20252025 engine
918#7,925,83815 blackJuly 31, 20252025 engine
919#7,931,19415 redAugust 1, 20252025 engine
920#7,958,77815 blackAugust 1, 20252025 engine
921#7,979,07915 blackAugust 1, 20252025 engine
922#8,045,59415 blackAugust 2, 20252025 engine
923#8,062,48415 blackAugust 2, 20252025 engine
924#8,065,10215 blackAugust 2, 20252025 engine
925#8,067,69115 redAugust 2, 20252025 engine
926#8,069,58815 blackAugust 2, 20252025 engine
927#8,079,19315 redAugust 2, 20252025 engine
928#8,132,84715 blackAugust 3, 20252025 engine
929#8,133,57515 blackAugust 3, 20252025 engine
930#8,147,82815 redAugust 3, 20252025 engine
931#8,167,60915 redAugust 3, 20252025 engine
932#8,175,91215 redAugust 3, 20252025 engine
933#8,201,59715 blackAugust 4, 20252025 engine
934#8,229,02715 blackAugust 4, 20252025 engine
935#8,246,27615 redAugust 4, 20252025 engine
936#8,261,02115 redAugust 4, 20252025 engine
937#8,296,84715 redAugust 5, 20252025 engine
938#8,298,27315 blackAugust 5, 20252025 engine
939#8,319,21215 redAugust 5, 20252025 engine
940#8,322,88915 redAugust 5, 20252025 engine
941#8,341,44615 blackAugust 5, 20252025 engine
942#8,342,04815 redAugust 5, 20252025 engine
943#8,343,87115 redAugust 5, 20252025 engine
944#8,407,77215 blackAugust 6, 20252025 engine
945#8,411,50315 blackAugust 6, 20252025 engine
946#8,417,19815 redAugust 6, 20252025 engine
947#8,478,20215 redAugust 7, 20252025 engine
948#8,478,42615 redAugust 7, 20252025 engine
949#8,486,75515 blackAugust 7, 20252025 engine
950#8,503,54315 blackAugust 7, 20252025 engine
951#8,505,25515 redAugust 7, 20252025 engine
952#8,509,59215 redAugust 7, 20252025 engine
953#8,517,24815 blackAugust 7, 20252025 engine
954#8,517,41815 blackAugust 7, 20252025 engine
955#8,532,48815 blackAugust 8, 20252025 engine
956#8,537,75515 blackAugust 8, 20252025 engine
957#8,541,05515 redAugust 8, 20252025 engine
958#8,568,65115 blackAugust 8, 20252025 engine
959#8,570,34515 blackAugust 8, 20252025 engine
960#8,572,02315 blackAugust 8, 20252025 engine
961#8,597,57515 blackAugust 8, 20252025 engine
962#8,631,25715 blackAugust 9, 20252025 engine
963#8,639,46215 redAugust 9, 20252025 engine
964#8,735,12915 blackAugust 10, 20252025 engine
965#8,794,73615 redAugust 11, 20252025 engine
966#8,804,80915 blackAugust 11, 20252025 engine
967#8,861,22215 blackAugust 12, 20252025 engine
968#8,872,51715 redAugust 12, 20252025 engine
969#8,872,51815 redAugust 12, 20252025 engine
970#8,882,84815 redAugust 12, 20252025 engine
971#8,889,43715 redAugust 12, 20252025 engine
972#8,900,37315 blackAugust 12, 20252025 engine
973#8,913,17115 blackAugust 12, 20252025 engine
974#8,926,31415 redAugust 12, 20252025 engine
975#8,930,92515 redAugust 12, 20252025 engine
976#8,967,65815 redAugust 13, 20252025 engine
977#8,969,25815 blackAugust 13, 20252025 engine
978#9,026,88515 blackAugust 14, 20252025 engine
979#9,034,38815 redAugust 14, 20252025 engine
980#9,040,54215 redAugust 14, 20252025 engine
981#9,058,00615 redAugust 14, 20252025 engine
982#9,077,25215 redAugust 14, 20252025 engine
983#9,088,83015 redAugust 14, 20252025 engine
984#9,112,90315 blackAugust 15, 20252025 engine
985#9,134,26015 blackAugust 15, 20252025 engine
986#9,154,04015 redAugust 15, 20252025 engine
987#9,157,74315 blackAugust 15, 20252025 engine
988#9,159,80915 blackAugust 15, 20252025 engine
989#9,168,93515 redAugust 15, 20252025 engine
990#9,210,14615 redAugust 16, 20252025 engine
991#9,214,63615 redAugust 16, 20252025 engine
992#9,291,62715 redAugust 17, 20252025 engine
993#9,303,06915 redAugust 17, 20252025 engine
994#9,313,53115 blackAugust 17, 20252025 engine
995#9,316,15315 redAugust 17, 20252025 engine
996#9,330,24415 redAugust 17, 20252025 engine
997#9,330,35515 redAugust 17, 20252025 engine
998#9,343,23115 blackAugust 17, 20252025 engine
999#9,344,15415 blackAugust 17, 20252025 engine
1,000#9,347,16715 redAugust 17, 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.