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. 1,322 shuffles have qualified so far.

RankShuffleRun lengthShuffledEra
101#10,748,88917 blackSeptember 3, 20252025 engine
102#10,992,77717 blackSeptember 6, 20252025 engine
103#11,016,10417 blackSeptember 6, 20252025 engine
104#11,134,98717 blackSeptember 7, 20252025 engine
105#11,316,82017 blackSeptember 15, 20252025 engine
106#11,479,85917 blackSeptember 17, 20252025 engine
107#11,486,16617 blackSeptember 17, 20252025 engine
108#11,532,48017 blackSeptember 17, 20252025 engine
109#12,008,00317 blackSeptember 23, 20252025 engine
110#12,181,98417 blackSeptember 25, 20252025 engine
111#12,214,86317 blackSeptember 25, 20252025 engine
112#12,263,40717 redSeptember 26, 20252025 engine
113#12,323,63217 blackAugust 28, 2026this site
114#12,359,01717 blackAugust 28, 2026this site
115#12,652,82717 blackSeptember 1, 2026this site
116#12,689,05017 blackSeptember 1, 2026this site
117#12,835,53217 redSeptember 3, 2026this site
118#12,883,42317 redSeptember 4, 2026this site
119#13,118,57717 blackSeptember 6, 2026this site
120#13,217,69717 redSeptember 7, 2026this site
121#13,263,59317 blackSeptember 8, 2026this site
122#13,440,05417 blackSeptember 10, 2026this site
123#13,616,25517 redSeptember 12, 2026this site
124#13,617,96617 redSeptember 12, 2026this site
125#13,888,07817 redSeptember 15, 2026this site
126#14,044,32317 redSeptember 17, 2026this site
127#23,71816 blackApril 28, 20252025 engine
128#25,10916 blackApril 28, 20252025 engine
129#78,45316 redApril 29, 20252025 engine
130#100,64916 redApril 29, 20252025 engine
131#155,24716 redApril 30, 20252025 engine
132#234,02916 blackMay 1, 20252025 engine
133#312,69616 blackMay 2, 20252025 engine
134#371,95016 blackMay 2, 20252025 engine
135#436,90916 blackMay 3, 20252025 engine
136#475,57316 redMay 4, 20252025 engine
137#494,87816 blackMay 4, 20252025 engine
138#543,05316 redMay 5, 20252025 engine
139#550,47116 blackMay 5, 20252025 engine
140#606,70916 blackMay 6, 20252025 engine
141#645,22716 redMay 6, 20252025 engine
142#771,40216 blackMay 8, 20252025 engine
143#773,95416 blackMay 8, 20252025 engine
144#808,49016 redMay 8, 20252025 engine
145#809,15716 redMay 8, 20252025 engine
146#829,23716 blackMay 9, 20252025 engine
147#869,88716 redMay 9, 20252025 engine
148#934,93516 redMay 10, 20252025 engine
149#1,016,91416 blackMay 11, 20252025 engine
150#1,052,63116 redMay 11, 20252025 engine
151#1,054,78916 blackMay 11, 20252025 engine
152#1,148,33616 redMay 12, 20252025 engine
153#1,171,64716 redMay 13, 20252025 engine
154#1,226,28816 blackMay 13, 20252025 engine
155#1,236,41316 redMay 13, 20252025 engine
156#1,271,18116 blackMay 14, 20252025 engine
157#1,356,69716 redMay 15, 20252025 engine
158#1,366,66316 blackMay 15, 20252025 engine
159#1,421,83416 blackMay 15, 20252025 engine
160#1,441,11216 redMay 16, 20252025 engine
161#1,486,73116 blackMay 16, 20252025 engine
162#1,502,98916 redMay 16, 20252025 engine
163#1,512,98816 blackMay 17, 20252025 engine
164#1,560,84316 blackMay 17, 20252025 engine
165#1,649,49916 blackMay 18, 20252025 engine
166#1,672,05516 redMay 18, 20252025 engine
167#1,830,61616 blackMay 20, 20252025 engine
168#2,099,35916 redMay 24, 20252025 engine
169#2,182,33416 redMay 25, 20252025 engine
170#2,369,48916 redMay 27, 20252025 engine
171#2,399,45616 blackMay 27, 20252025 engine
172#2,401,84616 blackMay 27, 20252025 engine
173#2,415,57716 blackMay 27, 20252025 engine
174#2,419,62616 redMay 27, 20252025 engine
175#2,473,14916 blackMay 28, 20252025 engine
176#2,508,54216 blackMay 28, 20252025 engine
177#2,536,49516 blackMay 29, 20252025 engine
178#2,632,01516 redMay 30, 20252025 engine
179#2,674,06316 redMay 30, 20252025 engine
180#2,693,33216 blackMay 31, 20252025 engine
181#2,700,55016 redMay 31, 20252025 engine
182#2,732,12016 redMay 31, 20252025 engine
183#2,881,24716 redJune 2, 20252025 engine
184#2,923,58216 redJune 2, 20252025 engine
185#2,944,75416 blackJune 3, 20252025 engine
186#3,110,53116 blackJune 5, 20252025 engine
187#3,150,16616 redJune 5, 20252025 engine
188#3,269,98716 blackJune 6, 20252025 engine
189#3,326,67716 redJune 7, 20252025 engine
190#3,420,86416 blackJune 8, 20252025 engine
191#3,436,32816 blackJune 8, 20252025 engine
192#3,485,51716 blackJune 9, 20252025 engine
193#3,586,20816 blackJune 10, 20252025 engine
194#3,654,18616 redJune 11, 20252025 engine
195#3,723,21016 redJune 12, 20252025 engine
196#3,811,69716 redJune 13, 20252025 engine
197#3,841,56816 redJune 13, 20252025 engine
198#3,869,45316 blackJune 14, 20252025 engine
199#3,900,77516 redJune 14, 20252025 engine
200#4,098,82116 blackJune 16, 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.