#### Zane_C

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This may seem obvious, but it's important to address.

It's a mistake many cubers (including myself) have made when starting big cubes BLD. Maybe you still do it.

I'm talking about memorising your centers perfectly, executing your memo perfectly, then taking off your blindfold with 100% confidence... to reveal UNSOLVED centers!

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Solving the corners first is popular for any sized cube. If you're using Old Pochmann, the U center/s are offset by a U' for every Y-perm!

The most obvious solution would be to either switch to a center-friendly corner method, or execute them after the centers.

If you really don't want to switch solving method or execution order:

You can do a U, U' or U2 set-up to rotate the centers to where they were when you memorised them. Then undo the set-up after the centers are solved. Cornelius Dieckmann does this.

Other solutions are stated in posts within this thread.

For M2 uses, M U2 M U2 and its inverse are NOT center-friendly.

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The common parity algs are NOT center-friendly, so execute parity algs AFTER the centers are solved.

Even after the centers are solved on a 5x5, a midge flipping or parity alg swapping UF and UB wings may still affect the centers.

Eg.

r2 U2 r2 Uw2 r2 u2 will disturb the centers if they are already solved.

Rw2 F2 U2 r2 U2 F2 Rw2 will NOT disturb the centers if they are already solved.

It's a mistake many cubers (including myself) have made when starting big cubes BLD. Maybe you still do it.

I'm talking about memorising your centers perfectly, executing your memo perfectly, then taking off your blindfold with 100% confidence... to reveal UNSOLVED centers!

**This is because after solving other pieces, the centers have been arranged differently to how you memorised them!****This error can be easily eliminated by solving centers FIRST.**

If you solve pieces before the centers (ie. wings, midges, corners), make certain that the algorithms you use do not disturb the centers!If you solve pieces before the centers (ie. wings, midges, corners), make certain that the algorithms you use do not disturb the centers!

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**Example:**Solving the corners first is popular for any sized cube. If you're using Old Pochmann, the U center/s are offset by a U' for every Y-perm!

*Solution:*The most obvious solution would be to either switch to a center-friendly corner method, or execute them after the centers.

If you really don't want to switch solving method or execution order:

You can do a U, U' or U2 set-up to rotate the centers to where they were when you memorised them. Then undo the set-up after the centers are solved. Cornelius Dieckmann does this.

Other solutions are stated in posts within this thread.

For M2 uses, M U2 M U2 and its inverse are NOT center-friendly.

---------------------------------------------------

**Parity algorithms:**The common parity algs are NOT center-friendly, so execute parity algs AFTER the centers are solved.

**Choose your parity/flipping algs wisely:**Even after the centers are solved on a 5x5, a midge flipping or parity alg swapping UF and UB wings may still affect the centers.

Eg.

r2 U2 r2 Uw2 r2 u2 will disturb the centers if they are already solved.

Rw2 F2 U2 r2 U2 F2 Rw2 will NOT disturb the centers if they are already solved.

Last edited: Jun 6, 2011