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But how do I use it. And is it the only parity? And what is this parity for?inner edges outer edges? Corners? Sorry can't understand. Btw where did you learn 5bld from?

When you said you'd learnt 4BLD, I assumed that you knew how to solve parity for outer edges. I also took "I don't know the alg not how to use them" to mean that you know how parity works and that you just needed an alg.

It's for inner edges and corners, but it depends on what buffers you use.

1. If your corner buffer is UBR, then solve all of your targets and then shoot to UFR, this will leave those corners swapped.
2. If you solve inner edges from UR, then solve all of your targets and then shoot to UL, this will leave what looks like a T-perm.
3. Apply T-perm, it will leave you with PLL parity, like on 4x4x4.
4. Solve this PLL parity.
 
Ollie I did some example solves but couldn't understand. I use my buffer as UBL or A using Speff's letter scheme what should I do? And what is the order of solving? By order I mean that what should I solve first what next what last..........
 
Ollie I did some example solves but couldn't understand. I use my buffer as UBL or A using Speff's letter scheme what should I do? And what is the order of solving? By order I mean that what should I solve first what next what last..........

I can't answer everything for you. If you have learned 4BLD like you say you have then this should be obvious to you.

When you solve your corners and you have parity, shoot to all of the targets in your memorisation, and then after that shoot to B. This will correct your edges and switch UBL and UBR ready to do your T perm.

If your edge buffer is B, then you'll probably have to shoot to A after all of your targets have been solved and do a J perm instead. This means you will have adjacent PLL parity instead of opposite PLL parity.

Solve centers first, because T perms rotate centers by 90 degrees each time so there is a danger of your centers being misaligned if you try and solve corners first. This means your execution will be wrong.

Try this tutorial: https://www.youtube.com/watch?v=w59BgT6piDU

Disclaimer: I've never learned OP, someone will correct me?
 
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Since you said you solve wings with r2, I'll assume you're using M2 for midges. I'll also assume you solve in the order wings, midges, corners.

A common way to fix 3BLD parity with M2 is, after solving all edges, to swap the UB and UL edges with an alg like D' L2 D M2 D' L2 D. Then you do an odd number of Y perms for corners and those swap UB and UL back.

The problem with 5BLD is that you can only do this on the single middle slice, and that means you only swap the midges, not their adjacent wings. Since your Y perm swaps entire tredges, you end up with a DNF due to swapped wings.

What you need is a parity alg that fixes only the inner M slice but swaps the entire tredges at UL and UB. Do that by embedding Ollie's alg into the above parity alg as follows:-

D' L2 D M2 (F2 (Rw2 F2 U2 r2 U2 F2 Rw2) F2) D' L2 D
 
Could someone explain or link me to a tutorial on how to tell if corners and edges are twisted when the cube is scrambled.

Thanks!
Look at the 3 stickers of the corner and the 3 surrounding centers of the corner. If the colors are the same it's twisted. If everything matches though the corners solvved
 
And there's short alg's that untwist them? I have been shooting to one sticker, then shooting to another sticker to get it back and oriented. There's a shorter way, right?
Yes, there are a number of algs that you can use. I use a flipping algorithm for edges, but I still shoot to two corner stickers as I haven't bothered to learn any algs for it yet. It's a good habit to get into though. There are quite a few that you can check out here: https://www.speedsolving.com/wiki/index.php/CO
 
And there's short alg's that untwist them? I have been shooting to one sticker, then shooting to another sticker to get it back and oriented. There's a shorter way, right?
(R U R' U R U2 R')(L' U' L U' L' U2 L) sune left sune
(L' U' L U' L' U2 L)(R U R' U R U2 R')left sune sune
(R U2 R' U' R U' R')(L' U2 L U L' U L) antisune left antisune
(L' U2 L U L' U L)(R U2 R' U' R U' R') left antisune antisune
these are the only algs i use
 
Here you got: http://blindfoldcubing.site40.net/MR8.html
In Polish but you need only list. Bufer is Ubr. Author: Marcin Zalewski.
oh, I was specifically after a UBL buffer list for U2 but I eventually realised I could just mirror the U and D face UBR algs L/R to get UBL buffer algs and use intuition for the rest of the targets. But thanks anyway!
 
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