It’s been a little while since I felt like I’ve accomplished much in terms of cubing, especially after plateauing at about 30-35 seconds on 3×3 solves. So, I decided to revisit PLL time attacks, and, after a few days of practice, got a good outcome: an on-camera 72-second PLL attack that started and ended with a solved cube:
By way of brief background, PLL is the last step in CFOP — once you have a solved bottom face, solved bottom two layers, and solved top face. All that’s left is to get those four edges and four corners in the top layer rejiggered into their proper position. There are 21 PLL cases (22 if you count solved), each named after a letter that somewhat resembles the pattern of the edge and corner swaps. More detailed background and the PLL algorithms can be found on the speedsolving.com wiki.
A PLL time attack is the performance of each of the 21 PLLs in a stream without stopping. Completing it in a minute is respectable, but not amazing; forty-five seconds is really good; and better than that is truly impressive. When I first learned PLLs, I did a quasi time attack — quasi because it was truncated (I did the Gs separately), because I did each PLL individually (not in a single stream), and because I used my best of three attempts per PLL. The sum of the 21 parts was 66 seconds. Continue reading