This is a gist to understand @r1ckp puzzle as shown by the following tweet:
<script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script>I built a puzzle cube I can't solve pic.twitter.com/wcMCK6to5k
— Rick (@r1ckp) July 2, 2016
+---+---+
| a | b |
+---+---+
| c | d |
+---+---+---+---+---+---+
| m | n | e | f | i | j |
+---+---+---+---+---+---+
| o | p | g | h | k | l |
+---+---+---+---+---+---+
| q | r |
+---+---+
| s | t |
+---+---+
| u | v |
+---+---+
| w | x |
+---+---+
Given the face with efgh
is top:
One 90° move of the cube around the x-axis forward sends the color at
a
toc
,c
toe
,e
tog
,g
toq
,q
tos
,s
tou
,u
tow
andw
toa
b
tod
,d
tof
,f
toh
,h
tor
,r
tot
,t
tov
,v
tox
andx
tob
a -90° move around the x-axis backwards does the opposite of the above.
Again, given the face with efgh
is top:
One 90° move of the cube around the y-axis to the left sends the color at
m
ton
,n
toe
,e
tof
,f
toi
,i
toj
,j
tox
,x
tow
andw
tom
o
top
,p
tog
,g
toh
,h
tok
,k
tol
,l
tov
,v
tou
andu
too
a -90° move around the y-axis to the right does the opposite of the above.
A move around the z-axis does nothing.
A short analysis of the of the puzzle points out that not every possible coloring of the facelets is solvable. In fact the chance of getting a solvable puzzle when you pick the colors randomly is fairly slim, i.e. 1 in 632468286450.