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
1,001#9,361,04915 redAugust 17, 20252025 engine
1,002#9,362,76115 blackAugust 17, 20252025 engine
1,003#9,369,45415 blackAugust 18, 20252025 engine
1,004#9,388,17215 redAugust 18, 20252025 engine
1,005#9,390,28015 blackAugust 18, 20252025 engine
1,006#9,420,37015 blackAugust 18, 20252025 engine
1,007#9,427,11815 blackAugust 18, 20252025 engine
1,008#9,431,53315 redAugust 18, 20252025 engine
1,009#9,433,78615 redAugust 18, 20252025 engine
1,010#9,452,49915 redAugust 19, 20252025 engine
1,011#9,453,34715 blackAugust 19, 20252025 engine
1,012#9,458,38515 redAugust 19, 20252025 engine
1,013#9,463,69115 redAugust 19, 20252025 engine
1,014#9,469,12415 blackAugust 19, 20252025 engine
1,015#9,499,44915 blackAugust 19, 20252025 engine
1,016#9,507,85015 blackAugust 19, 20252025 engine
1,017#9,523,75715 blackAugust 19, 20252025 engine
1,018#9,532,95815 blackAugust 19, 20252025 engine
1,019#9,556,51015 blackAugust 20, 20252025 engine
1,020#9,568,17015 redAugust 20, 20252025 engine
1,021#9,613,16115 redAugust 20, 20252025 engine
1,022#9,617,78115 blackAugust 20, 20252025 engine
1,023#9,621,00315 redAugust 21, 20252025 engine
1,024#9,643,29815 blackAugust 21, 20252025 engine
1,025#9,647,69315 blackAugust 21, 20252025 engine
1,026#9,649,88915 redAugust 21, 20252025 engine
1,027#9,681,90015 redAugust 21, 20252025 engine
1,028#9,699,66315 redAugust 21, 20252025 engine
1,029#9,727,62215 redAugust 22, 20252025 engine
1,030#9,816,37315 blackAugust 23, 20252025 engine
1,031#9,898,88015 redAugust 24, 20252025 engine
1,032#9,906,75315 redAugust 24, 20252025 engine
1,033#9,917,28215 blackAugust 24, 20252025 engine
1,034#9,938,97115 blackAugust 24, 20252025 engine
1,035#9,944,54615 blackAugust 24, 20252025 engine
1,036#9,949,07215 blackAugust 24, 20252025 engine
1,037#9,952,45415 blackAugust 24, 20252025 engine
1,038#9,955,82915 redAugust 24, 20252025 engine
1,039#9,961,81115 redAugust 25, 20252025 engine
1,040#9,963,51615 blackAugust 25, 20252025 engine
1,041#9,982,35615 blackAugust 25, 20252025 engine
1,042#10,001,74515 blackAugust 25, 20252025 engine
1,043#10,012,52715 blackAugust 25, 20252025 engine
1,044#10,014,46515 blackAugust 25, 20252025 engine
1,045#10,016,04815 blackAugust 25, 20252025 engine
1,046#10,020,12415 redAugust 25, 20252025 engine
1,047#10,024,84715 redAugust 25, 20252025 engine
1,048#10,025,46415 redAugust 25, 20252025 engine
1,049#10,044,69915 redAugust 26, 20252025 engine
1,050#10,068,97215 redAugust 26, 20252025 engine
1,051#10,096,61815 blackAugust 26, 20252025 engine
1,052#10,103,37515 redAugust 26, 20252025 engine
1,053#10,110,55315 redAugust 26, 20252025 engine
1,054#10,122,95915 blackAugust 26, 20252025 engine
1,055#10,125,14315 blackAugust 26, 20252025 engine
1,056#10,134,63815 blackAugust 27, 20252025 engine
1,057#10,137,25715 blackAugust 27, 20252025 engine
1,058#10,145,66215 redAugust 27, 20252025 engine
1,059#10,147,66515 blackAugust 27, 20252025 engine
1,060#10,155,49615 redAugust 27, 20252025 engine
1,061#10,156,36815 blackAugust 27, 20252025 engine
1,062#10,171,15215 redAugust 27, 20252025 engine
1,063#10,175,74515 blackAugust 27, 20252025 engine
1,064#10,179,26715 blackAugust 27, 20252025 engine
1,065#10,192,36115 blackAugust 27, 20252025 engine
1,066#10,197,06815 blackAugust 27, 20252025 engine
1,067#10,200,89215 blackAugust 27, 20252025 engine
1,068#10,231,79215 blackAugust 28, 20252025 engine
1,069#10,244,04815 blackAugust 28, 20252025 engine
1,070#10,248,22015 redAugust 28, 20252025 engine
1,071#10,265,03015 redAugust 28, 20252025 engine
1,072#10,279,90915 blackAugust 28, 20252025 engine
1,073#10,280,02115 blackAugust 28, 20252025 engine
1,074#10,297,34115 redAugust 29, 20252025 engine
1,075#10,302,50515 redAugust 29, 20252025 engine
1,076#10,307,51115 blackAugust 29, 20252025 engine
1,077#10,310,01815 blackAugust 29, 20252025 engine
1,078#10,335,24815 redAugust 29, 20252025 engine
1,079#10,387,21615 blackAugust 30, 20252025 engine
1,080#10,424,38415 redAugust 30, 20252025 engine
1,081#10,447,81915 redAugust 30, 20252025 engine
1,082#10,453,31215 redAugust 30, 20252025 engine
1,083#10,468,95115 redAugust 31, 20252025 engine
1,084#10,470,66815 blackAugust 31, 20252025 engine
1,085#10,471,56815 redAugust 31, 20252025 engine
1,086#10,487,99515 blackAugust 31, 20252025 engine
1,087#10,527,36315 blackAugust 31, 20252025 engine
1,088#10,555,80815 blackSeptember 1, 20252025 engine
1,089#10,570,78215 redSeptember 1, 20252025 engine
1,090#10,573,18115 redSeptember 1, 20252025 engine
1,091#10,586,01415 redSeptember 1, 20252025 engine
1,092#10,593,86915 blackSeptember 1, 20252025 engine
1,093#10,605,12415 blackSeptember 1, 20252025 engine
1,094#10,678,34815 redSeptember 2, 20252025 engine
1,095#10,682,68415 redSeptember 2, 20252025 engine
1,096#10,684,89915 blackSeptember 2, 20252025 engine
1,097#10,700,59615 redSeptember 2, 20252025 engine
1,098#10,701,53915 blackSeptember 2, 20252025 engine
1,099#10,703,39515 blackSeptember 2, 20252025 engine
1,100#10,726,76115 redSeptember 3, 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.