There are 8 categories (including the so-called Winter Variation), and 27 algorithms in each category. How to memorize them (216 in total)?
I adopted the following way for all categories.
1. Position the final pair in the U face to the front. You can slot it in by R U’ R’ in a normal way.
2. Group them, based on the U-face-color pattern of the U face.
3. Put the name of each group.
4. Memorize the corresponding algorithms by group, looking at the R and/or L sides of the corner piece(s) (CP) of the U layer.
I explain the above 2 in more detail.
As the last pair is positioned to the front side, the 3 CP whose position changes are UFR, UBR, and UBL.
As each CP has 3 angle positions, and when the U-face color of them is up, the pattern of the U-face is affected. There are following 8 cases:
1. No corner is up.
2. Only UFR is up.
3. Only UBR is up.
4. Only UBL is up.
5. Only UFR and UBL are up.
6. Only UBR and UBL are up.
7. Only UFR and UBR are up.
8. All 3 corners are up.
And the number of the algorithm in each pattern is as follows:
Pattern 1 -> 8
Pattern 2, 3, 4 -> 4 each
Pattern 5, 6, 7 -> 2 each
Pattern 8 -> 1
If you sum up these numbers, you will get 27.
The interesting thing is that you need to look at the R and/or L sides of the CP of the U layer, and never look at the F and B faces!
I have ordered the algorithms, based on which CP locates its U-face color face to the R or L side.
Pattern 1: All 3 CP; UFR and UBR; UFR and UBL; Only UFR; UBR and UBL; Only UBR; Only UBL; None.
Pattern 2: UBR and UBL, Only UBR; Only UBL; None.
Pattern 3: UFR and UBL; Only UFR; Only UBL; None.
Pattern 4: UFR and UBR; Only UFR; Only UBR; None.
Pattern 5: UBR; None.
Pattern 6: UFR; None.
Pattern 7: UBL; None.
Pattern 8: None.
I will show all the algorithms I chose from the next article.