• Welcome to the Speedsolving.com, home of the web's largest puzzle community!
    You are currently viewing our forum as a guest which gives you limited access to join discussions and access our other features.

    Registration is fast, simple and absolutely free so please, join our community of 35,000+ people from around the world today!

    If you are already a member, simply login to hide this message and begin participating in the community!

Redi Cube Discussion Thread

Joined
Dec 24, 2015
Messages
1,460
Likes
912
Where to start disassembling this thing? :DAnd can I find screws somewhere: is tensioning possible? Any tips?
This is what I did: Pull out the edge caps, then try to pull out the edge base pieces one at a time. (I think it's possible to remove a whole edge piece directly without removing the caps first, but for the first few edge pieces, it's easier to remove the caps first.) Once the three edges surrounding a corner have been taken out, you can remove the corner caps, which exposes the screws.
 
Joined
May 28, 2008
Messages
162
Likes
70
Location
China
WCA
2008CHEN27
The God Number of Redi Cube is 19

In the past several hours, I've finished the calculation of the God Number of Redi Cube.
There're totally 12!/2*3^8 = 1,571,364,748,800 different positions.
Here's the depth distribution:
Code:
Depth      Positions               Total
 0                 1                   1
 1                16                  17
 2               160                 177
 3             1,408               1,585
 4            11,808              13,393
 5            95,712             109,105
 6           754,732             863,837
 7         5,793,810           6,657,647
 8        43,183,952          49,841,599
 9       310,137,312         359,978,911
10     2,115,556,475       2,475,535,386
11    13,329,858,542      15,805,393,928
12    72,848,819,814      88,654,213,742
13   298,247,080,974     386,901,294,716
14   671,767,938,009   1,058,669,232,725
15   473,215,625,205   1,531,884,857,930
16    39,395,024,521   1,571,279,882,451
17        84,824,763   1,571,364,707,214
18            41,254   1,571,364,748,468
19               332   1,571,364,748,800
According to the table, there're 332 different positions cannot be solved in 18 moves and therefore the god number of Redi Cube is 19. The average depth is about 14.037. The result as well as depth distribution matches the random solving test proposed in Redi Cube Discussion Thread - Page 3

I use 48 symmetries to reduced the calculation space to about 32 billion and use conventional BFS with backward optimization (as introduced in http://kociemba.org/math/pruning.htm) to calculate the distribution.
The results of depth<=8 have been cross checked by a brute force solver, and I'll do some more validation on other results, especially the 332 19-depth states.
 
Last edited:

Mike Hughey

Super Moderator
Staff member
Joined
Jun 7, 2007
Messages
9,712
Likes
1,685
Location
Indianapolis
WCA
2007HUGH01
YouTube
MikeHughey1
So I'm curious - is anyone fast with Redi Cube without table abuse? Or does everyone who's fast use table abuse to solve it?

I guess I'm old-school - it still feels like cheating to me to use the table. Even though I know that for several events (megaminx, OH) it has come to be almost guaranteed to be used by WR holders.

I just got one today and it feels like it's probably much faster to solve with table abuse than without?

I admit that somehow its being such an intuitive puzzle makes it kind of addicting, for a while, anyway.
 
Joined
Aug 9, 2015
Messages
425
Likes
149
WCA
2015TEBO01
YouTube
channel/UCM7dSp9z0hkmytrPpe99e8A
So I'm curious - is anyone fast with Redi Cube without table abuse? Or does everyone who's fast use table abuse to solve it?

I guess I'm old-school - it still feels like cheating to me to use the table. Even though I know that for several events (megaminx, OH) it has come to be almost guaranteed to be used by WR holders.

I just got one today and it feels like it's probably much faster to solve with table abuse than without?

I admit that somehow its being such an intuitive puzzle makes it kind of addicting, for a while, anyway.
I definitely use table abuse, i think more than even most solvers. Like for me, the cube is never off the table.
 
Joined
Mar 29, 2017
Messages
58
Likes
26
YouTube
channel/UCXAdCUZOgWTZetTaYonwPDg

Mike Hughey

Super Moderator
Staff member
Joined
Jun 7, 2007
Messages
9,712
Likes
1,685
Location
Indianapolis
WCA
2007HUGH01
YouTube
MikeHughey1
Joined
Oct 17, 2018
Messages
146
Likes
94
Location
France
WCA
2018ROHA01
Message to the organizers of competitions with ivy cube: can you please publish your competition's results in Redi Cube? (like what is being done in kilominx)

Message to all others: do you know a ranking or database storing Redi Cube results?
 
Top