Square-1 EP solving approach

[ilikecubing]

Hey all,
EP is a really time consuming step in solving the square-1 using the Vandenbergh's method.
I'm pretty sure different solvers have different approaches in solving it depending upon the number of algs they know and also depending on the speed with which they perform the algs.
Choosing the right alg while solving is important,which comes with experience and practice.

This thread is to discuss on what is the best way to solve some cases and also for people to write down their own approach.

Ofcourse some cases are really fast and easy like just U perms or Z perms on one layer
There are some EP cases which I really hate and are time consuming for me,ofcourse I can learn algs for them but I hate learning a lot of algs and maybe some smart solving here might help Note that case on the left is the cases on U layer and case on the right is the case on D layer

1) adj-U,opp-Z,H-adj and all other cases which fall under the same category where there is just an edge swap on one layer and a 3x3 PLL on the other layer ,One could just use the adj-adj or opp-opp alg to solve either the U or D layer completely,but that would leave us with a single layer parity EP on the U or D layer which always sucks.Which algs are really worth learning for such cases? I'm not sure if just one fast alg which solves the parity and then doing 1 or 2 more algs to solve completely is a good idea,is it worth learning a lot of algs for such cases?

2) U-Z,Z-Z,Z-H,Z-U etc : both U perm and Z perm on square 1 are fast,but doing one,and then another after doing a z2 or a layer swap can take time.So is an alg for such cases really worth learning?

3)W-O,W-W,O-O,O-W : This can be converted into the type of cases mentioned above using an adj-adj or opp-opp alg.Then again we have to continue doing 3x3 PLLs on both layers unless we are lucky.

So how really would you go on for solving such cases?

 

[MTGjumper]

1) adj-U: do O perm on bottom to leave adj-adj
opp-Z: do O perm on bottom to leave opp-opp
H-adj: adj parity on bottom, then H perm; or adj parity on top, and then W-adj (very fast); or learn the case

2) for any case without H perm, do adj-adj twice.
for combinations of H and U, do the diag-adj CP alg twice, but offset the top and bottom layers in between

3) I hate these. I normally do opp-opp and then solve the result with adj-adj.

 

[vcuber13]

1. paritycp

2. same as mtgjumper

3. if its double j cp i force 3x3 eplls or just opp opp then adj adj and opp opp

 

[Czery]

Using CP parity really helps. It cuts down the number of EP cases by one half.

Non-parity algorithms are generally just cancelled adj/adj alg's so it's really not that hard to learn most of those cases. If you have really fast turning speed EP shouldn't really be a problem.
IMO optimizing shapes is much more interesting. I can generally make move counts optimal but I often fumble when fixing shapes.

 

[Cheese11]

Alright, I just finished learning all the necessary square-1 algs yesterday. Currently I'm just using the parity alg that switches 2 edges to do EP and it's not very efficient at all. I'm trying to learn some more EP algs and was wondering which ones I should learn (I've been using the CubeZone website). I've learnt the U perms already.

(Sorry if this is the wrong thread)

 

[Czery]

Learn adj-adj . Learn opp-opp.

adj adj: (1, 0) / (3, 0) / ( -1, -1)/ (-2, -1) /
opp opp: M2 U M2

Use these two together to reduce any case (without parity) until it's solves.

Example: H perm
Opp/opp U Opp/opp

I personally started out by learning U, Z, H perms and applying those. But most people use the method mentioned above.