The One Answer Question Thread

**Riley** · 08-19-2012

Originally Posted by kbrune

I'm new to the 4x4 (about 10 solves up to parity) and I have a newb question. I already know 3x3. So far I've intuitively learned to solve centers and edge pairing except for when I only have two pairs left. I haven't learned how to deal with parity yet.

My question:

I solve white and yellow centers first then add the remaining 4 centers. I sometimes put the last four centers in the wrong position (twice out of 10 attempts) Is there an alg that swaps two centers wether adjacent or opposite while preserving edge pairs? Or should I just keep practicing until I never make that mistake?

If two centers are adjacent and need to be swapped, I do: Rw U2 Rw Lw' U2 Lw (start with centers on top and in front)
If two centers are opposite and need to be swapped I do: Rw2 U2 Rw2 Lw2 U2 Lw2 (start with centers on top and in front)

With some practice, this will usually never happen. Or you could be like me, and always solve the last four centers in the same order.

**Ickathu** · 08-19-2012

Originally Posted by kbrune

I'm new to the 4x4 (about 10 solves up to parity) and I have a newb question. I already know 3x3. So far I've intuitively learned to solve centers and edge pairing except for when I only have two pairs left. I haven't learned how to deal with parity yet.

My question:

I solve white and yellow centers first then add the remaining 4 centers. I sometimes put the last four centers in the wrong position (twice out of 10 attempts) Is there an alg that swaps two centers wether adjacent or opposite while preserving edge pairs? Or should I just keep practicing until I never make that mistake?

Originally Posted by Riley

If two centers are adjacent and need to be swapped, I do: Rw U2 Rw Lw' U2 Lw (start with centers on top and in front)
If two centers are opposite and need to be swapped I do: Rw2 U2 Rw2 Lw2 U2 Lw2 (start with centers on top and in front)

With some practice, this will usually never happen. Or you could be like me, and always solve the last four centers in the same order.

For opposite swaps you can just do M2 Uw2 M2 Uw2. It doesn't matter which way you hold it, cause any two opposite swaps will make it solvable, but it swaps F and B.