Corners with the modified Y-perm

The corner buffer is the top back-left corner (letter A). The algorithm R U’ R’ U’ R U R’ F’ R U R’ U’ R’ F R swaps it with the bottom front-right corner, on its right face (letter P).

Memo works the same as for edges: start from the top sticker of the buffer and follow the letters.

For each letter, a setup brings that spot to P, using only R, D and F. For example, for letter V: R’ D’, the algorithm, then D R. For letter C: F, the algorithm, then F’.

A corner can be in place but twisted: it then gives two letters, those of two of its stickers.

Remember: Always do edges before corners, no exceptions.

Troubleshooting

A corner is twisted at the end

It needed to be in the memo: a twisted corner counts as two letters.

The setup breaks the buffer

Corner setups never use U, L or B: those faces touch the buffer.