Generally, I find the OLL “dot” cases frustrating — there are a bunch of them, they’re hard to identify/distinguish quickly, and their algorithms are long. A few months ago, I worked on a couple OLL dot cases that I had previously two-looked. Those came rather easily. Then I got side-tracked by the Megaminx, 4×4 modding, and PLL time attacks.

I decided to work on more OLLs last week, after stumbling onto Ottozing’s very good Cubing World video showing all of the dot cases. Specifically, these three:

OLL #18 (Crown)

(r U R’ U) (R U2′) r2′ (U’ R U’ R’) U2 r

OLL #19 (Bunny)

M U (R U R’ U’) M’ (R’ F R F’)

OLL #20 (Checkerboard)

(r U R’ U’) (L r) (R’ l’) (L2 l2′) (U R U’ R’) U’ M’

Here’s a video showing each in slow motion and then full (still works-in-progress) speed:

(music:Grateful Dead, “The Eleven” (2.14.68); cubes:Fanshi Shuang Ren (walk-throughs) and Lubix Zhanchi (solves), each w/ Cube Specialists fitted Bright+ stickers with grey for U face)

Some thoughts on each:

OLL 18: This one took me a while to get down until I realized that it’s basically two wide sunes (OLLs 7 and 8), mated through the r2′.

OLL 19: I found Ottozing’s execution of this one a bit clunky. He does an r R2′ in the middle, which is essentially an M’. Converting to the M’ sped things up and also made it flow nicely — with the wide r’ simplified into an R’ as the first move of an easy sledgehammer variant (R’ F R F’): Setup (M U) > Sexy Move > M’ > Sledgehammer.

OLL 20: I learned this one a long time ago, but never could get it down efficiently. I just realized from Nick Rech’s video that this mirror of the algorithm I had originally learned is much easier. Note that he performs a double-M slice in the middle. But, based on the first moves, your fingers aren’t appropriately placed for an M2. Instead, I execute it as a L2 l2′, which together is effectively an M2. The execution is easier than it sounds, and occurs by turning the left wrist backward and right forward, and then reversing it.