Random Cubing Discussion

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xyzzy said:
A classmate just told me that the cutoff for 4×4×4 at Singapore Open dropped from 70 seconds to 60 seconds…
Click to expand...

Soft cut for 5×5×5 at SG Championship 2018 dropped from 1:40 to 1:35, just as I get to averaging around 1:37 over the past few weeks… There's a decent chance I'll end up with official averages for 2-7 except 5 after this comp.
 
*clackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclackclack*
 
is there a tetrahedron puzzle where each side looks like this?

(not a pyraminx)
 

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Found this alg for an A perm, thought it was cool:
Aa: (y') r2 U r2 U' r2 U' D r2 U' r2 U r2 D' U
Ab: (y) D U ' r2 U' r2 U r2 D' U r2 U r2 U' r2 U'

Got the idea from earlier when someone mentioned using the wide R turn T perm for their A perms and I wondered if it could be applied to the (R U) T perm that I had learned earlier this year. I really like it as a non-rotation A perm (I always despised the original A perms specifically because of their rotation beforehand). I actually used it in a comp earlier this week. It's not the most amazing because it is a very wide turning alg but I think it has a nice flow to it.

Edit: Last move on Aa could be an E slice move, if you're trying to fingertrick it. Same for the first move of Ab
 
Last edited:
TyeDye said:
Found this alg for an A perm, thought it was cool:
Aa: (y') r2 U r2 U' r2 U' D r2 U' r2 U r2 D' U
Ab: (y) D U ' r2 U' r2 U r2 D' U r2 U r2 U' r2 U'

Got the idea from earlier when someone mentioned using the wide R turn T perm for their A perms and I wondered if it could be applied to the (R U) T perm that I had learned earlier this year. I really like it as a non-rotation A perm (I always despised the original A perms specifically because of their rotation beforehand). I actually used it in a comp earlier this week. It's not the most amazing because it is a very wide turning alg but I think it has a nice flow to it.

Edit: Last move on Aa could be an E slice move, if you're trying to fingertrick it. Same for the first move of Ab
Click to expand...

That's pretty interesting. I think it's probably not great if your objective is to be as fast as possible, because the typical A-perms are around .5 seconds for top cubers, but if you care more about the feel than the speed it's pretty sweet. Definitely a very non-typical finish to a solve, almost a square-1 feel.
 
Could someone please explain the different levels of cubing members when people say either "Platinum, Gold etc. Members" I know what and how someone gets the platinum level, but the rest I have not been able to find any information on. Thank you all very much in advance for taking the time to help answer.
 
cubeshepherd said:
Could someone please explain the different levels of cubing members when people say either "Platinum, Gold etc. Members" I know what and how someone gets the platinum level, but the rest I have not been able to find any information on. Thank you all very much in advance for taking the time to help answer.
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"All WCA Events Completion" Club
 
Since I think I have enough reputation on this forum that I can sacrifice some of it by disagreeing with existing convention: I think "false equivalence" and "false equivocation", as applied to puzzles with identical pieces, are bad and misleading terms and people should stop using them. The problem now is to come up with a sufficiently catchy replacement term, I guess.

(I've mentioned this (once) in r/cubers before and maybe I hadn't built up enough of a reputation there as "that guy who knows a lot about puzzle theory", because people started arguing back with horrendously shaky arguments demonstrating exactly why I disliked those terms.)
 
xyzzy said:
Since I think I have enough reputation on this forum that I can sacrifice some of it by disagreeing with existing convention: I think "false equivalence" and "false equivocation", as applied to puzzles with identical pieces, are bad and misleading terms and people should stop using them. The problem now is to come up with a sufficiently catchy replacement term, I guess.

(I've mentioned this (once) in r/cubers before and maybe I hadn't built up enough of a reputation there as "that guy who knows a lot about puzzle theory", because people started arguing back with horrendously shaky arguments demonstrating exactly why I disliked those terms.)
Click to expand...
Can you give an example? I'm familiar with those terms as logical fallacies but I don't think I've seen them used in the context of puzzles.

Ok, I tested out my Google before posting, and I found a post where someone refers to what some call "parity" involving a twisted single-coloured corner on a mastermorphix as "false equivalency". I agree with you, "false equivalency" is a terrible term here, but I also agree that "parity".

I've always just thought of this as a free twist, because I can twist that corner for free when twisting another corner. I also think of free swaps on other puzzles (eg Sudoku cube has identical edges)
 
AlphaSheep said:
Ok, I tested out my Google before posting, and I found a post where someone refers to what some call "parity" involving a twisted single-coloured corner on a mastermorphix as "false equivalency". I agree with you, "false equivalency" is a terrible term here, but I also agree that "parity".
Click to expand...
That's one example, although I don't think it's a common usage. And calling apparent corner twists "parity" gets me too, because the definition of the word "parity" came from mathematics and it means whether something is even or odd, nothing more.

AlphaSheep said:
Can you give an example? I'm familiar with those terms as logical fallacies but I don't think I've seen them used in the context of puzzles.
Click to expand...
As I understand them, they're applied to puzzles with identical parts that can be swapped, e.g. the edges of a mastermorphix. (And like you've pointed out, depending on the exact stickering, a sudoku cube might have identical pieces too.) Swapping such pieces, on a puzzle that has a parity constraint, then leads to a "parity-like" situation where you have to do the seemingly impossible task of swapping only two pieces. The solution is to do a pair of 2-cycles instead, which is an even permutation.

My objection to those terms is that it leads one to think that the (completely legit) equivalence of pieces is somehow false, illegitimate. Were one to take a puzzle with such identical pieces in its solved state, then disassemble and reassemble with just two identical pieces swapped, who in their right mind would argue that it's not really solved?
 
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