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R U' F U' F D' B L' D2 B U B' D2 R' U' L2 F L B D R D F L' D

z y // inspection
U2 R' U' F L F' // cross
x' R U' R' U L' U L U' L U L' // 1st pair
U2 L' U L U' R U R' // 2nd pair
U y L U L' // 3rd pair
U R U' R' // 4th pair
R U R' U R U2 R' // OLL
U' R' U R' U' R' U' R' U R U R2 // PLL

Kevin Hays - 21.38 4×4×4 single (unofficial) (from https://www.twitch.tv/videos/273352011; I don't know if he'll be reuploading it to his YT channel and it looks like Twitch doesn't store VODs indefinitely)

/* Solve */
// first two centres
R u U r' // white
(y' z) r' r2 U' U' r' x' U' r U r' // yellow
// three cross dedges
(x' z') x r' U // white-red
x' x' x 3r r' U' r x' L U' // white-green
x (R' 3l') U l U // white-orange
// last four centres + cross
L' x' F' L' x' L' U2 r2 U' r // red
3r r' U' 3r r' U2 3r' r2 U' U' r U' U' r' // blue
3r' U' r U' r' // orange, green
(x' z') F u' U' R' U' R u D R' D // white-blue
// edge pairing (green-orange and green-red skipped)
u' U' U F R' F' R y' U L' U L u // red-blue, yellow-red, yellow-blue
U' L' U L u' U U y' U R U' R' u // green-yellow, orange-blue, yellow-orange
// 333 stage
U y' R' U' R2 U R' // first slot
y U R U R' U L U L' // second slot
R U' R' U R' U' R // third slot
R U' R' U' R U' R' U R U' R' // last slot
R' U' R U' R' U y' R' U 3l U // OLL
x R' U R' U' R' U' R' U R U R2 // PLL

D' F2 U B2 U F2 L2 R2 D2 F2 U' L D' B F2 D' U' F D U' B2

z y2 // inspection
U' R' U' r2' F' r u' // cross
U' R' U R // 1st pair
U2' R U' R' U R U R' // 2st pair
y2 U R U' R2' U2' R U R' U2' R // 3th pair & 4th pair
R U R' U' R' F R F' // OLL

note:
dL and dR are the faces on the front; dbL, dbR and dB are the faces on the back.
Rotations use WCA square bracket notation.

[r2'] // inspection (yellow top, white front)
dL bL' dR U U (R' [l]) [u'] dR' // white star
// F2L (orange top, purple front)
R' U R [f] (R [u']) U' R U2 R' // green-purple slot
U' U' R' U' R U R2' U' U' (R2 [r']) // yellow-purple slot
U' [r] U [u'] R U2 R U' (R2' [r]) // red-green slot
(U [f]) U' U' R U R' U ([l] [u']) R U2 F U' F' // blue-yellow slot
U [f'] U2 R U' R' U2 R U' R' // red-blue slot
// yellow S2L (pink top, blue front)
[u'] U' R' F R dL // yellow star
([u'] [f]) [f] [f'] U U R' [f'] R' R R' U' R // blue-light green slot
[f] [u'] [r] U' R U R' U R L' U (L [f']) // orange-purple slot
U' R U' R' // light green-orange slot
// purple S2L (grey top, orange front)
[u'] F' U' R' R R' F R // purple-light blue edge
U' [u'] U' R' U R R2 U' R2' // green-light blue slot
R R' U R' U R U' R' U' R // orange-light blue slot
// green S2L (grey top, cream front)
F // green-cream edge
U' U' R U R' (U [u']) R' U' R // light blue-cream slot
[r] R U R' U' R U R' // red-cream slot
// second-last face (pink top, red front)
U // red-pink edge
[r'] [u'] R' U' R R U2 R U' R2' // blue-pink slot
U R' U' R U' R' U R // cream-pink slot
U R U' R' U U R U' U' R' U [u'] R' U' R // light green-pink slot
// last layer (grey top, orange front)
U' U' F U R U' U' R' U' R U2 R' U' F' // OLL
U' (R L) U2 L' U (L R') U' R U2 L' U2 R' // EP
U [u'] R' dR' R U2 R' dR R U2 R' dR' R U R' dR R // CP

I haven't seen one either, although @xyzzy you might want to check the scramble in the video as the scramble Feliks has at the end is not the same one you have listed (likely due to a misscramble).

I haven't seen one either, although @xyzzy you might want to check the scramble in the video as the scramble Feliks has at the end is not the same one you have listed (likely due to a misscramble).

Oh, trust me, I've spent a lot of time checking the scramble. I'm pretty sure Feliks misscrambled (usually after a D-- there will only be U'); if you're used to scrambling megaminx accurately, you might have mentally autocorrected the D-- U to D-- U'.

Edit: I was wrong about the misscrambling! qqtimer (the timer Feliks used) actually generates scrambles where the direction of the U move is independent of the preceding move. However, csTimer's and TNoodle's megaminx scrambles have the U in the same direction as the preceding move.

Oh, trust me, I've spent a lot of time checking the scramble. I'm pretty sure Feliks misscrambled (usually after a D-- there will only be U'); if you're used to scrambling megaminx accurately, you might have mentally autocorrected the D-- U to D-- U'.

D-- U' is the same as U2 y2', so it's still a 2/5 turn. D-- U would cancel into U' y2, which is only a 1/5 turn. 2/5 turns tend to mix up the puzzle pieces more efficiently.

Spoiler

The actual reason is probably something more like "that's what Stefan Pochmann coded back in the day, and nobody bothered to change it".

Scramble: L2 B2 R2 U2 R2 U F2 L2 D R2 F2 B' L' F L' R2 U B2 L2 F' R2
Inspection: x'
Cross: D L U' Rw'
F2L#1: y R U' R'
F2L#2: U' R' U R
F2L#3: y2 U' R' U' R
F2L#4: R U R'
OLL: R U R' U R U2 R'
PLL got skippy (iykwim)
25HTM/4.68 = 5.34
TPS 21 Moves, if some moves are cancelled.

So I got my first sub-20 feet single, but I can't reconstruct it

19.48 U' L' F2 D F' U' L' B U R' F2 L2 F2 L2 U L2 U' F2 D R2 D'

I know I started with z2 u' R2 B' U2 R'
I remember noticing the blue red pair but I don't remember how I did it
I'm pretty sure the solve ended in L' U2 R U R' U2 L into PLL skip (possibly no AUF?)

Could someone help me reconstruct? I would really appreciate it

Just got a 3x3 pb single and am struggling to reconstruct.

Generated By csTimer on 2018-7-8
single: 6.779

Time List:
1. 6.779 F2 U B' R B' U B D2 F' R' D2 L2 U' F2 U F2 U2 L2 U L2 D

Pretty sure i started off with z2 U R' F R D F' but I'm not positive. I assume I took the three move pair from there but idk. I know I ended with sexy sledge into either U or U' auf. Any help on this would be great

Cornelius Dieckmann 4.83 3x3 NR Single - WCA European Championship 2018

Spoiler: Video

F2 R F2 L' D2 R2 D2 U L' D2 U2 R' F2 L2 B L D R2 F

y x2 // inspection
L D' F L R2 D // cross
y' U y' R U' R' L U' L' // 1st pair
R U R2' U2' R // 2nd pair
y' R U2' R2' U' R // 3rd pair
U F' U' F U R U' R' // 4th pair / OLS
U' // AUF View at alg.cubing.net cubesolv.es/5342