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• Hello guys its me CriticalCubing and today I am making an in-depth video on the LSE step of Roux method

• LSE is the last step of Roux method, its the 4th step in which you solve the last six remaining edges, hence LSE

• 4 edges are on the top, and 2 on bottom, hence 6 edges. LSE can be broken down into 3 mini steps

• First step, is 4a and you solve Edge Orientation

• Here you make all the sticker on top and bottom, either white or yellow

• In this case, I have green and red so I switch them up and make all stickers white/yellow

• Next step is solving UL/UR edges which is solving the right side of the cube, and the left side

• In this step, you solve the edge that comes in here and the edge that comes in here

• For solving this step, you keep both the edge in bottom

• and then you just put them on the top like this

• and then you solve this side and this side

• The last step is called 4c in which only the middle slice is left to be solved

• and you solve the middle slice by doing one alg like this

• Those are the 3 steps of LSE

• 4a is solving edge orientation EO. 4b is solving UL/UR edges and 4c is solving the rest

• Now we are going to get indepth into these steps

• First step of LSE is called edge orientation and in this step you get all the edges to be either white or yellow

• and in this step, we are introduced to the concept of bad edges and good edges. Good edges are edges which already have white/yellow on top like this one

• and bad edges are those edges that do not have white/yellow on top. Red is bad edge, green is bad edge, blue is bad and this is good edge

• And the most important case of EO is called Arrow case. In arrow case you have 3 bad edges on top

• and one bad edge will be in the bottom

• Now if you have yellow or white facing towards you in the bottom piece, that means its a bad edge

• otherwise if you have any other sticker like green/red that means, its a good edge

• This is the arrow case, 3 on top and one on bottom and for solving this when the edge is in the front

• you do M' and then you do U or U' and you do M' once more

• and this is the next arrow case and this is from the back and one important thing to remember when recognizing bad edges and good edges

• is that bad edges will always come in pairs, so there will never be odd number like 1/3/5 and they will always be even 2/4/6

• For example, I see 3 bad edges on top and this is not a bad edge. Because bad edges always come in pairs

• the last bad edge is at the back as 3+1 is even no and bad edges always come in pairs

• and for solving the arrow case with edge at the back, you do M U or U' and then M'

• Now we are going to go over each of the EO cases and first I'll show you the beginner cases and then more intermediate ones

• First we are going to start with 2 flips and this is the first case and in this case you have 1 in here

• and one in here, and this can be either vertical like this or horizontal like this

• and for solving this 2 flip case, you do M' U' M

• for getting the arrow and you can solve the arrow by doing M' U' M' or M move

• Now the same 2 flip case can be in the bottom and for solving the case when its in the bottom, you do this

• M' U' M' which gives us the arrow case and then you can solve the arrow

• This is the next 2 flip case and you have both of the edges adjacent to each other

• and when you have these two in this position, at the back and the right, you do this

• M' U' M' which brings us the arrow case and then you just solve the arrow case

• this is the same 2 flip case as before but now you have the edges in right and front

• and you can always do U' and solve from here, but if you want to be even more efficient, you can solve it from here too

• but doing M U M which brings us arrow case and then you solve the arrow case

• this is the same 2 flip case from U2 angle and for solving this you do M U' M'

• which gives you arrow from back and then you solve arrow case

• and this is the same case from U' angle and for solving this you do M' U M

• which gives you arrow case from front, and you solve arrow

• do remember one thing, arrow cases from front start with M' move and then you can do U' or U move

• and then you can either do M or M'. Only the first M' move matters, after that you can do U, U', M, M' and the EO will still be solved

• same goes for the arrow cases from the back. Only the starting M move matters

• then you can do U, U', M', M and the EO will still be solved

• this is the last 2 flip case and you have 2 edges like this

• one on the top and one on the bottom, and when you have the case like diagonally opposite from each other, you do this

• M U' M which gives you arrow and then you solve the arrow case

• and you can get the case like this and this is just the mirror case. Instead of using M moves, you use M' moves

• For solving this case, you do M' U' M' which gives arrow case and then you solve arrow

• Now sometimes you may get cases like this where you have edge on the side, instead of being on the top

• and in these type of cases, instead of doing U and solving it, you can solve it from here too saving 1 move

• the thing that you have to do is insert the edge, where the good edge is

• In this case, I have the bad edge at the back, so I insert the edge in here with M' U M

• and that will give me the arrow case from the back so I can just solve arrow cased

• and when you get the case like this with the bad edge in front, you insert the edge at the back with M U M'

• and that will give you the arrow case from front and you can solve the arrow case

• Now comes the 4 flip case and in this case, you have 2 bad edges on the top, and 2 on the bottom

• and for solving this case, you keep the bad edges on the top in horizontal line and these will be vertical

• and for solving this you do M' U2 M'

• That will give you the arrow case and you can solve the arrow case

• This is the next 4 flip case and in this case you have all the 4 edges on top like this

• and for solving this case you do M' U2 M' and then you solve the arrow case

• This is the last 4 flip case and here you have 2 bad edges on the top and they are adjacent

• and 2 will be at the bottom and for solving this, you keep the bad edges anywhere you want

• Keep the bad edges anywhere and do M2 and then solve arrow case

• for example, I can keep this in here and do M2 and I get the arrow case

• and then I can just solve arrow case for solving this EO case

Hello guys its me CriticalCubing and today I am making an in-depth video on the LSE step of Roux method

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# ROUX METHOD LSE (Last Six Edges) COMPLETE GUIDE | TUTORIAL

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邱頌傑 posted on 2017/10/01
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