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. 1,321 shuffles have qualified so far.

RankShuffleRun lengthShuffledEra
1#8,262,62020 redAugust 4, 20252025 engine
2#12,603,45020 blackAugust 31, 2026this site
3#14,60019 blackApril 28, 20252025 engine
4#528,23419 blackMay 5, 20252025 engine
5#6,127,54819 redJuly 10, 20252025 engine
6#9,492,34819 redAugust 19, 20252025 engine
7#12,439,96819 blackAugust 29, 2026this site
8#14,59918 blackApril 28, 20252025 engine
9#594,52818 redMay 6, 20252025 engine
10#1,076,81818 redMay 11, 20252025 engine
11#2,479,77118 blackMay 28, 20252025 engine
12#2,780,89418 redJune 1, 20252025 engine
13#4,825,62418 redJune 25, 20252025 engine
14#4,926,30618 blackJune 26, 20252025 engine
15#5,189,11818 redJune 29, 20252025 engine
16#5,342,47418 redJuly 1, 20252025 engine
17#5,985,99218 redJuly 9, 20252025 engine
18#6,027,31518 redJuly 9, 20252025 engine
19#6,058,64318 blackJuly 9, 20252025 engine
20#6,206,58318 redJuly 11, 20252025 engine
21#8,339,08518 blackAugust 5, 20252025 engine
22#8,370,31518 blackAugust 6, 20252025 engine
23#8,602,90918 blackAugust 8, 20252025 engine
24#8,995,83918 redAugust 13, 20252025 engine
25#10,593,61818 redSeptember 1, 20252025 engine
26#11,429,71418 blackSeptember 16, 20252025 engine
27#11,869,62318 redSeptember 21, 20252025 engine
28#13,530,86418 redSeptember 11, 2026this site
29#13,807,02218 redSeptember 14, 2026this site
30#15,35917 redApril 28, 20252025 engine
31#84,91917 blackApril 29, 20252025 engine
32#758,81717 blackMay 8, 20252025 engine
33#802,76817 blackMay 8, 20252025 engine
34#841,58017 blackMay 9, 20252025 engine
35#1,188,06717 blackMay 13, 20252025 engine
36#1,410,52217 blackMay 15, 20252025 engine
37#1,830,87317 blackMay 20, 20252025 engine
38#1,830,87417 redMay 20, 20252025 engine
39#1,843,55117 redMay 20, 20252025 engine
40#1,943,85117 redMay 22, 20252025 engine
41#2,243,28617 redMay 25, 20252025 engine
42#2,313,95217 blackMay 26, 20252025 engine
43#2,545,88017 redMay 29, 20252025 engine
44#2,607,51717 redMay 30, 20252025 engine
45#2,820,91617 blackJune 1, 20252025 engine
46#3,137,35417 blackJune 5, 20252025 engine
47#3,146,38417 blackJune 5, 20252025 engine
48#3,235,39217 blackJune 6, 20252025 engine
49#3,443,48617 redJune 8, 20252025 engine
50#3,707,84817 redJune 12, 20252025 engine
51#3,716,97717 redJune 12, 20252025 engine
52#3,859,03417 redJune 13, 20252025 engine
53#4,002,20217 blackJune 15, 20252025 engine
54#4,384,55817 redJune 20, 20252025 engine
55#4,455,32317 redJune 20, 20252025 engine
56#4,571,22117 redJune 22, 20252025 engine
57#4,839,67317 blackJune 25, 20252025 engine
58#4,968,52617 blackJune 27, 20252025 engine
59#4,991,16417 redJune 27, 20252025 engine
60#5,302,56417 redJune 30, 20252025 engine
61#5,819,98817 blackJuly 7, 20252025 engine
62#5,958,91217 blackJuly 8, 20252025 engine
63#5,980,05417 redJuly 8, 20252025 engine
64#6,347,35317 blackJuly 13, 20252025 engine
65#6,443,50117 blackJuly 14, 20252025 engine
66#6,468,46617 redJuly 14, 20252025 engine
67#6,824,45117 blackJuly 18, 20252025 engine
68#6,950,13017 blackJuly 20, 20252025 engine
69#6,950,81317 redJuly 20, 20252025 engine
70#6,999,32317 redJuly 21, 20252025 engine
71#7,032,52017 redJuly 21, 20252025 engine
72#7,337,72417 redJuly 25, 20252025 engine
73#7,425,52617 blackJuly 26, 20252025 engine
74#7,488,73017 blackJuly 26, 20252025 engine
75#7,624,32117 redJuly 28, 20252025 engine
76#8,039,41217 redAugust 2, 20252025 engine
77#8,200,52217 blackAugust 4, 20252025 engine
78#8,220,77517 redAugust 4, 20252025 engine
79#8,353,57717 blackAugust 6, 20252025 engine
80#8,600,80717 blackAugust 8, 20252025 engine
81#8,654,48717 blackAugust 9, 20252025 engine
82#8,753,81917 blackAugust 10, 20252025 engine
83#8,797,62017 redAugust 11, 20252025 engine
84#8,911,05117 blackAugust 12, 20252025 engine
85#8,954,38517 redAugust 13, 20252025 engine
86#9,282,51617 redAugust 17, 20252025 engine
87#9,374,55917 redAugust 18, 20252025 engine
88#9,395,01117 blackAugust 18, 20252025 engine
89#9,512,22417 redAugust 19, 20252025 engine
90#9,601,14917 blackAugust 20, 20252025 engine
91#9,614,89117 redAugust 20, 20252025 engine
92#9,694,43417 blackAugust 21, 20252025 engine
93#9,833,50017 redAugust 23, 20252025 engine
94#10,006,83217 redAugust 25, 20252025 engine
95#10,247,64517 blackAugust 28, 20252025 engine
96#10,274,88717 redAugust 28, 20252025 engine
97#10,387,21717 blackAugust 30, 20252025 engine
98#10,515,67517 blackAugust 31, 20252025 engine
99#10,622,82717 blackSeptember 1, 20252025 engine
100#10,719,90117 blackSeptember 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.