[Guide] Solving The Rubik's Cube - Page 8

rKzzz

Germany58 Posts

October 23 2011 16:23 GMT

#141

You can achieve sub-20 with lbl and sub-15 with petrus maybe even less. Fridrich is the main speedcubing method though and all 3x3 world records (excluding 1982) have been achieved with it. Top cubers average as low as sub-8 of 10 solves with it.

ThePhan2m

Norway2739 Posts

October 23 2011 16:34 GMT

#142

I actually learnt the Rubix cube like over a year ago. I remember this thread and it was one of my goals to learn it. I spent about 2 hours on YouTube to learn the algorithms... I made it look harder than it seemed. Now its pretty easy. Got a personal record on about 1 min. I've also learnt it to 10+ people at my school. Cubing really is fun :D I also learnt the 4x4 & 5x5. Next step is to learn the Petrus method on the 3x3.

.DrK

Canada326 Posts

October 24 2011 07:31 GMT

#143

i use fridrich's method and a year or so ago my average was around 20 seconds. haven't cubed in a while, but i think i can solve at around 35 seconds no problem now.

Blisse

Canada3710 Posts

October 24 2011 08:01 GMT

#144

I can get 1 minute easily if I had a decent cube. The main problem is that if you don't play as much, or you play too much, it gets very sticky and it's a huge pain to relube it every other week. So I've given up. Just one of the fun things you have to learn in life, and now it's not a super mystery like it was before. Still impresses some people, while being called a nerd by others. Hehe.

Haven't tried the other methods because there's a lot more things to do nowadays, and it's enough that I can solve it; I don't feel like I need to be good good.

NEXUS6

United States413 Posts

October 24 2011 19:07 GMT

#145

I remember back in the day I could solve one of these puppies pretty fast even almost figured out the 4x4

Xiphias

Norway2223 Posts

November 30 2011 09:19 GMT

#146

On October 11 2011 03:39 Orpheos wrote:

Show nested quote +

hes probably a math major. group theory is very pertinent to the designing of algorithms for OLL and PLL because the easier/more intuitive algorithms are essentially performing a set of actions, then something in the middle to displace or orient some pieces and then doing and inversion of the first set of actions.

Yes, math major is correct. It will be a study in symmetry groups. Haven't started writing it yet though.

Dirkzor

Denmark1944 Posts

July 11 2012 12:42 GMT

#147

Okay question... I learned this with a working corner on the first layer and then solved the last corner peices (4 on 3rd layer and the working corner on the 1st layer) using these algorithms:

When using these you move the block from the Front upper left corner to the Back buttom right corner. So which ever peice I want to move starts at Front upper Left corner.

L B2 L' U/U2/U' (depending on which I corner from the 3rd layer I want move to the working corner position) L B2 L.
F' B2 F U/U2/U' (See above) F' B2 F.

Then just use these 2 to get all the corners in the correct position AND correct orientation.

I have the working corner away from me at the buttom and the 4 corners from the 3rd layer on top.

Maybe I can't remember all from that guide I used but I seem to e unable to orient the corner peices correctly using only these 2 algorithms. I can't find the guide I used and every other guide I find uses the method from the OP. I can combine the 2 by solving the working corner peice and then just use the OP way, but I would like to know how to solve it "my way" and if someone could tell me what I'm missing...

Reason I want this method is that It is intuitive for me and I really don't remember any algorithms at all (Only wrote it down so you might understand what I'm doing)

If anyone can find the/a guide which solved it like this I would be grateful.

Thanks!

Slithe

United States985 Posts

July 16 2012 19:01 GMT

#148

On July 11 2012 21:42 Dirkzor wrote:
Okay question... I learned this with a working corner on the first layer and then solved the last corner peices (4 on 3rd layer and the working corner on the 1st layer) using these algorithms:

When using these you move the block from the Front upper left corner to the Back buttom right corner. So which ever peice I want to move starts at Front upper Left corner.

L B2 L' U/U2/U' (depending on which I corner from the 3rd layer I want move to the working corner position) L B2 L.
F' B2 F U/U2/U' (See above) F' B2 F.

Then just use these 2 to get all the corners in the correct position AND correct orientation.

I have the working corner away from me at the buttom and the 4 corners from the 3rd layer on top.

Maybe I can't remember all from that guide I used but I seem to e unable to orient the corner peices correctly using only these 2 algorithms. I can't find the guide I used and every other guide I find uses the method from the OP. I can combine the 2 by solving the working corner peice and then just use the OP way, but I would like to know how to solve it "my way" and if someone could tell me what I'm missing...

Reason I want this method is that It is intuitive for me and I really don't remember any algorithms at all (Only wrote it down so you might understand what I'm doing)

If anyone can find the/a guide which solved it like this I would be grateful.

Thanks!

At first I wasn't quite able to figure out what your algorithms are trying to do. I think you mixed up the notation, and whenever you wrote B (back face), you actually meant D (down face). Also I think there's a mistake in your first alg, the last L should be L'.

Hopefully what i said is true, because otherwise I just wasted a lot of time with the rest of this post lol.

The two algorithms you listed are actually mirror images of each other, and you have to use the correct one based on what the current orientation of the corner already is.

[image loading]

For the white-green-orange corner, if the white color is facing to the right, then you want to do the first alg. Otherwise, you want to do the second alg. BTW, the working corner is in the back bottom and not visible from this POV.

In the case of the first cube in my picture, I'd have to do one extra move (either U or U', doesn't matter) because of the position of the corner. Example Alg:
U' L D2 L' U L D2 L'

Final Note: One thing I noticed about this algorithm is that it only moves 3 of the corners, and keeps all the other pieces in place. Is this an intentional result because your method needs to maintain all the other pieces? The reason I ask is because if all you're trying to do is solve the first layer corners, you can do it much more efficiently (3-4 moves instead of 7-8).

RobiTL

France55 Posts

July 16 2012 19:22 GMT

#149

Thanks to you I bought a rubik's cube and managed to solve it in under 1m30s (i changed the algorithms a little though)

FullNatural

United States180 Posts

August 01 2012 02:57 GMT

#150

Dirkzor

Denmark1944 Posts

August 01 2012 07:40 GMT

#151

I totally forgot to answer you Slithe. You were right that I miswrote my algorithm. The one you wrote was the one I was thinking about. I figured this out on my own eventually but thank anyway.

And yes I use this method to keep all other peices where they are since I solve the upper layer corners + the working corner in the buttom layer last. So I solve buttom layer (minus the working corner), mid layer, upper layer cross, upper layer corners + working corner.

yokohama

United States1116 Posts

August 01 2012 07:56 GMT

#152

I started learning Fridrich Method the other day and even doing it slowly it has cut my time significantly on the f2l compared to the beginner method. I am having trouble though once i have 3 out of 4 sides finding the correct way to quickly get my 4th pair together without messing up the others.