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Hey Cubers, I have been stuck on the professor cube for a few weeks now. I have two edge pieces that need to be swapped. I can't find any solution. I know that I can solve it like the revenge and 3x3 If I could get past this part. If anyone can help I would greatly appreciate it.

There are a few cases that you can get in 5x5 and 5x5+ cubes.

You can try to intuitively understand, how slice flip undo slice works, and then last 2 edges becomes intuitive. Otherwise you can lookup the optimal algs from kirjava meep or any other 5x5 expert's pdf.

I need to swap the red/green edge with the orange/yellow edge piece. I figured out how to do that but then when re-orienting the centers, some of the edge pieces get messed up. Do I solve the edges first or the centers?

with the last 2 edges I usually end up flipping the edges and doing 4x4 pairing until I have 2 edge that have center pieces that need to be swapped (on odd number cubes), then I swap them,.. then usually I have to do the edge flip-parity algorithm on 1 edge to flip the wings.

Some people have every edge algorithm memorized but I found this works for me. I can always get the two edges into a solvable state this way.

Edge Flip (R, U, R', F, R', F', R)

Free-slice

4x4 pairing (Dd, R, F', U, R', F, Dd')

Center swap (R2', F2, U2, R2', U2, F2, R2) (*how deep the R move is varies with the cube size, sometimes it's 2 or 3 layers deep that you need to go to get all the the R pieces that need to be involved. Like on a 5x5 I'd go 2 layers deep in an R move because the 3rd layer from either side is the center. On a 7x7 I'd go 3 layers deep because the 4th layer is the center.)

Edge flip/Parity alg to flip 2 wings but not an entire edge piece (R', U2, L, F2, L', F2, F2, U2, F, U2, F', U2, F2, F2, F2) (*again how deep the R is varies with cube size)

maybe not the most elegant solutions but I'm not speedsolving I just like solving big cubes. I know a few more edge pairing algorithms but honestly these are the ones that work pretty much every time. Sometimes I have to play with the last 2 edges for a minute to get them into a solvable state, but it always works for me.

Good luck. Big cubes are a ton of fun and (at least in my experience) very addicting.

I average sub 1:10 and what helped me get there was mostly just good edge pairing. You should be able to go into edge pairing straight away with little pause. Look for your next set of edges while doing one, etc. That's all I can really offer though. Good luck!

If your OLL and PLL are taking 8 seconds each, you can surely cut a lot from there. 3 seconds OLL parity + 2 seconds OLL + 2 seconds PLL parity + 3 seconds PLL = 10 seconds.

Besides that, the other big time losses are from 3cross and L4C. Make a conscious effort to focus harder during those steps; that might help you look ahead better, cutting down pauses. (Cross is a really annoying step to get good at because the pieces can be almost anywhere, and the unsolved colourful mess in the visible part of the cube makes it harder to find the pieces.)

I do want to point out that that solve had terrible edge pairing, I found a video of it and saw I had like an 8 second pause in the middle. Also my first centers+cross are normally a bit longer cause I have a pause after doing the first one (as far as I can plan with around 20 seconds of inspection).

My OLL Parity takes about 4 seconds to execute and I had a really bad awkward shape case in this solve. The pll was weird cause I started doing an A perm and realised it was J Perm Parity so had to retrace my steps. With all that I’m kind of confused how I actually managed to get sub 1:10 on that solve.

My f4c is usually okay, it seemed around normal in that solve and same thing with cross.

Generally I’m getting a sub 1:10 every 3 solves.

I thought I’d include another one just for references: