Challenge: scramble and solve using only double moves

[Kirjava]

Step 1: Solve as much as you can
Step 2: Solve the rest

I generally try to make a block of some kind then get most edges in the right places while solving corners

every solve is different though, you just do whatever is best for the scramble

learn stuff like F2R2U2R2F2R2U2R2 because you need it

scramble: B2 U2 R2 U2 D2 R2 U2 D2 F2 R2 F2 R2 D2 U2 B2 U2 R2 B2 F2 U2 B2 F2 U2 D2 R2

step 1: L2 U2 R2 F2 R2 U2 R2
step 2: U2 B2 y (U2 F2 L2 F2 U2 L2 U2 F2 L2 D2 B2 D2) R2 U2

I practised this a bit when I was doing threeduction

EDIT: moar?

scramble: B2 D2 L2 R2 U2 R2 F2 R2 B2 L2 F2 R2 L2 B2 U2 F2 R2 F2 D2 F2 L2 B2 F2 R2 F2

step 1: R2 F2 R2
step 2: yx' F2 R2 U2 R2 F2 R2 U2 R2 y F2 M2 F2 U2 M2 U2

scramble: U2 D2 F2 R2 L2 B2 D2 L2 D2 U2 B2 R2 B2 L2 R2 B2 L2 F2 R2 U2 F2 D2 L2 U2 R2

step 1: L2 F2 R2 S2 R2 U2 R2 u2
step 2: x'y' F2 R2 U2 R2 F2 R2 U2 R2

scramble: B2 D2 U2 R2 B2 F2 D2 F2 D2 U2 B2 D2 B2 F2 L2 R2 B2 L2 F2 R2 U2 L2 R2 B2 R2

step 1: L2 B2 d2
step 2: R2 B2 R2 B2 R2 B2 R2 E2 R2 E2

scramble: B2 R2 B2 D2 U2 R2 D2 L2 U2 B2 L2 U2 D2 F2 D2 R2 B2 D2 R2 B2 R2 L2 B2 F2 L2

step 1: E2 B2 x
step 2: U2 F2 L2 F2 U2 L2 U2 F2 L2 D2 B2 D2 x2 F2 R2 U2 R2 F2 R2 U2 R2

hopefully this shows you you need to just take advantage of the state the cube is in

 

[Stefan]

Average of 12: 13.13
1. 13.75 D2 U2 R2 F2 U2 D2 F2 R2 L2 U2 D2 L2 R2 D2 F2 D2 F2 B2 U2 D2 L2 F2 R2 F2 B2
2. (4.77) D2 R2 D2 R2 U2 D2 R2 L2 U2 F2 R2 B2 F2 L2 D2 R2 U2 D2 R2 F2 D2 L2 R2 U2 F2
3. 9.20 L2 B2 D2 F2 B2 D2 F2 U2 D2 R2 F2 R2 U2 R2 D2 U2 R2 D2 B2 R2 U2 F2 B2 D2 F2
4. 22.59 D2 L2 B2 L2 U2 D2 F2 R2 L2 F2 D2 R2 L2 D2 R2 U2 D2 L2 B2 U2 F2 B2 R2 B2 R2
5. 15.69 L2 D2 B2 D2 U2 F2 R2 F2 B2 D2 B2 R2 L2 B2 F2 U2 D2 F2 L2 F2 U2 F2 R2 B2 L2
6. 15.47 F2 U2 F2 U2 B2 L2 U2 D2 F2 L2 B2 U2 B2 R2 L2 F2 U2 F2 D2 B2 D2 L2 F2 U2 D2
7. 14.92 F2 R2 U2 L2 D2 R2 U2 B2 U2 L2 B2 D2 L2 B2 U2 R2 D2 L2 B2 D2 U2 R2 D2 R2 D2
8. (22.98) B2 L2 B2 D2 L2 U2 R2 D2 F2 L2 B2 F2 L2 F2 R2 B2 R2 F2 B2 L2 B2 R2 L2 U2 B2
9. 10.72 B2 L2 R2 U2 R2 L2 B2 R2 B2 D2 F2 L2 U2 L2 R2 U2 R2 B2 F2 U2 F2 R2 L2 U2 F2
10. 11.72 R2 L2 B2 L2 U2 F2 D2 R2 U2 R2 B2 R2 F2 D2 R2 F2 B2 R2 U2 L2 B2 D2 R2 U2 F2
11. 11.48 B2 U2 F2 B2 D2 U2 F2 B2 R2 L2 F2 R2 L2 D2 L2 F2 U2 B2 F2 R2 U2 F2 L2 R2 D2
12. 5.74 L2 B2 L2 U2 R2 B2 L2 U2 F2 B2 L2 D2 R2 F2 R2 L2 F2 D2 F2 L2 B2 D2 B2 U2 R2

 

[PedroSabioni]

Step 1: Solve as much as you can
Step 2: Solve the rest

I generally try to make a block of some kind then get most edges in the right places while solving corners

every solve is different though, you just do whatever is best for the scramble

learn stuff like F2R2U2R2F2R2U2R2 because you need it

scramble: B2 U2 R2 U2 D2 R2 U2 D2 F2 R2 F2 R2 D2 U2 B2 U2 R2 B2 F2 U2 B2 F2 U2 D2 R2

step 1: L2 U2 R2 F2 R2 U2 R2
step 2: U2 B2 y (U2 F2 L2 F2 U2 L2 U2 F2 L2 D2 B2 D2) R2 U2

I practised this a bit when I was doing threeduction

EDIT: moar?

scramble: B2 D2 L2 R2 U2 R2 F2 R2 B2 L2 F2 R2 L2 B2 U2 F2 R2 F2 D2 F2 L2 B2 F2 R2 F2

step 1: R2 F2 R2 yx' F2 R2 U2 R2 F2 R2 U2 R2
step 2: y F2 M2 F2 U2 M2 U2

scramble: U2 D2 F2 R2 L2 B2 D2 L2 D2 U2 B2 R2 B2 L2 R2 B2 L2 F2 R2 U2 F2 D2 L2 U2 R2

step 1: L2 F2 R2 S2 R2 U2 R2 u2
step 2: x'y' F2 R2 U2 R2 F2 R2 U2 R2

scramble: B2 D2 U2 R2 B2 F2 D2 F2 D2 U2 B2 D2 B2 F2 L2 R2 B2 L2 F2 R2 U2 L2 R2 B2 R2

step 1: L2 B2 d2
step 2: R2 B2 R2 B2 R2 B2 R2 E2 R2 E2

hopefully this shows you you need to just take advantage of the state the cube is in

Thanks, man! I've already succeeded a couple of times

 

[guysensei1]

How do you solve the H-Perm with only double moves?

 

[Kirjava]

[B2 L2 D2: R2 F2 R2 F2 R2 F2]

long form B2 L2 D2 R2 F2 R2 F2 R2 F2 D2 L2 B2

 

[elrog]

I came up with the idea of a method that reduces to this subset only to find that it already existed. It is quite fun, but isn't very practical. It is called HTA which is short for Human Thistlethwaite Algorithm which can be found on Ryan Heise's cubing page here: http://www.ryanheise.com/cube/human_thistlethwaite_algorithm.html

 

[qqwref]

I, and a few others, tried this back in 2008: http://mzrg.com/auwr/recs_halfturns_avg10.html

The method was pretty much intuitive 2x2x3 block -> solve the rest.


EDIT: Just tried this again and after some rolling got this nice avg12:
5.63, 5.43, 4.21, 5.80, 5.93, (12.07), 4.87, 9.26, (4.13), 7.16, 4.53, 4.99 => 5.78 (σ = 1.48)

 

[Zeotor]

SuperAntoniovivaldi on YouTube has made videos about this with a few NxNxN puzzles.
- 3x3x3
- 3x3x3 supercube
- 4x4x4
- 4x4x4 supercube
(All of the above can be found in this playlist.)
- 5x5x5
- 5x5x5 supercube

 

[TDM]

I'm doing Corners first with all double turns. So far I have gotten a couple of smooth sub 10s but I'm averaging 30+. When I get to spam R2 U2 R2 and M2 U2 M2 it's easy enough, but sometimes I get to L4E and they're all in bad places. What are you doing Kir? Editing to say I just quit on a solve. Was going for over 2 minutes with bad cases and I simply didn't manage. This is hard, and doing corners first seems very luck based. I tried doing an average. 9.36, 26.35, DNF, 7.54, DNF. This is hard O_O

I did this a while ago, and I also did corners first. I found (R2' F2 R2 U2')2 did a 3-cycle equivalent to U2 M' U2 M, and that helped a lot. I still hate H perms though.

 

[stoic]

52.44 avg5 with a lolscramble 7.53
Corners first

 

[Renslay]

Years ago I came up with this challenge:

1) Scramble the cube with double turns.
2) Apply a single quater turn.
3) Scramble the cube with double turns again.

Solve it in a way that you can apply only one quater turn.

It shouldn't be too hard, but I found it quite fun.

 

[elrog]

I do something similar with my 4x4. First, I scramble it like a 2x2, then do a single outer layer turn, scramble like a 2x2 again, and finally solve using 1 outer layer turn.