OLL26 & 27 (OCLL)

Anti-Sune (R U2′ R’ U’ R U’ R’) (OLL26, 2×2 block at right back corner)

Back Anti-Sune (R’ U2′ R U R’ U R) (OLL27, 2×2 block at right front corner)

Sune (R U R’ U R U2′ R’) (OLL27, 2×2 block at left front corner)

Back Sune (R’ U’ R U’ R’ U2′ R) (OLL26, 2×2 block at left back corner)

I have changed a couple of times the way to distinguish and turn these 2 OLLs.

At first, I was using the mirror method with right and left hands, depending on either OLL26 or OLL27, without any AUF.

Later, I used the edge piece adjacent to the 2×2 block as a key for recognition, because it is necessary to turn firstly the slice in which that piece is included. Also without AUF beforehand.

With above mentioned methods, I had to choose the right algorithm out of 8 ones (4 algorithms by each OLL).

Later and currently I am using another method. I am using right hand only, which means turning R or U-slice, not L-slice. And only 4 algorithms shown above. But AUF may be necessary.

Here is the process.

1) There is a colored corner piece at the left side on F-face -> Move 2×2 block to the near back corner if not so. And apply Anti-Sune or Back Sune, depending on the 2×2 block position, as shown above.

2) There is a colored corner piece at the right side on F-face -> Move 2×2 block to the near front corner if not so. And apply Back Anti-Sune or Sune shown above, depending on the 2×2 block position, as shown above.

3) There is not a colored corner piece on F-face -> If the 2×2 block is at right front corner, apply Back Anti-Sune. If the 2×2 block is at left front corner, apply U + Back Sune.

I memorized above 1) & 2), repeating in my mind “left -> back, right -> front”.