5x5 Last Tredge Problem

[rahulkadukar]

I got the following case. I am using the Redux method, I mean I solve the centers then pair up the edges and finally solve as 3x3. I often end up with the last two tredges as incomplete and when I try to solve I complete one and the other is shown in the image below.

I went on to complete the solve without finishing the last tredge and got the position shown above.

Should I leave the last tredge till the end as shown above or should I solve it before going for the 3x3 Solve stage. In any case, how should I proceed.

 

[Ellis]

You've got parity

http://www.bigcubes.com/5x5x5/lastedges.html

Always finish the edges before moving on to the 3x3

 

[Stefan]

Should I leave the last tredge till the end as shown above or should I solve it before going for the 3x3 Solve stage.

Ellis already answered this, but now I ask *you* to come up with at least two reasons (I see two).

 

[fredqbr]

You've got parity

http://www.bigcubes.com/5x5x5/lastedges.html

Always finish the edges before moving on to the 3x3

Yes, it's the single edge flip on their page, but the comment is "...there are a couple of algs for this case...";
it's true but why don't they publish a shorter one like r' U2 l F2 l' F2 r2 U2 r U2 r' U2 F2 r2 ?

 

[Stefan]

What's the second half of that sentence you quoted?

 

[fredqbr]

What's the second half of that sentence you quoted?

"but this one seems to be the most popular" as it was the most popular to reduce the parity case to the single edge flip.

 

[Stefan]

Exactly. And I'd say there's your answer. Or it's because they didn't/don't know the shorter one yet, or don't like it as much. But if you want to know for sure, you have to ask them.

 

[fredqbr]

I asked them.

 

[FrankMorris]

And I did not respond to you.

We chose the one that is on the site because it is the one we like most. I also think that it is better execution wise. I prefer it anyway.

Frank

 

[fredqbr]

Thanks for the answer, but I still don't know why the credits page was updated

 

[rahulkadukar]

Should I leave the last tredge till the end as shown above or should I solve it before going for the 3x3 Solve stage.

Ellis already answered this, but now I ask *you* to come up with at least two reasons (I see two).

I think that the first reason would be that If I leave it till the end then I would have a greater restriction on my movements as almost all of the cube would be solved.

Secondly, I dont know

 

[rahulkadukar]

There are shorter Algorithms

And I did not respond to you.

We chose the one that is on the site because it is the one we like most. I also think that it is better execution wise. I prefer it anyway.

Frank

I believe that the first two cases can be solved as shown

This is how you recognize the first case:

* On the left there are two completed pieces on the top.
* Its partner is on the right up and has the same color on the face.
* On the bottom right are two pieces twisted different
* On the bottom left is the piece that matches bottom right face.

Algorithm Old: (Dd) R U R' F R' F' R (Dd)'
Algorithm New: (Dd) R F' U R' F (Dd)'

This is how you recognize the second case:

* On the left there are Two completed pieces on the bottom.
* Its partner is on the right down and has the same color on the face.
* On the Up right are two pieces twisted different
* On the up left is the piece that matches up right face.

Algorithm Old: (Dd)' L' U' L F' L F L' (Dd)
Algorithm New: (Uu)' R F' U R' F (Uu)

Hope you update the page