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23 PB2, ongoing German Forum Comp
Edit: If you find a mediocre skeleton (like say 20 to 5c which will give say 30-31) would you immediately begin finding insertions?

Officially, possibly, but for backup skeletons it's probably better to have something that's quick to insert like (26 to 3c). I'd still write it down, but I'd be unlikely to insert unless very desperate within the last 10 mins.
Likewise, I wouldn't do insertions until the last 15/20 minutes unless I find a really good skeleton.

For CO-first domino reduction see Attila's solves (for example this post and the following two, one by me). I'll wrap in a spoiler everything regarding the ongoing german forum comp.

Spoiler

I have a couple of CO-first domino reductions for that scramble, with that start (I have found the reduction during the 1hr attempt but couldn't finish it):

Spoiler

First:
U B' F L' //EO
F' D B' //CO
U' R2 //Setup
F L2 R2 B' or F' L2 R2 B //DR in 13

Second:
U B' F L' //EO
F' D B' //CO
(R2 B L2 R2 F) //DR in 12
U' R2 D2 F2 * D' F2 D' F2

* = F2 D2 F2 + D2 F2 D2
+ = L2 D' R2 S2 R2 D L2 = 29

But there is also a very nice start on inverse (EO + 2 squares as well):
(D' B F' R B')

Following up on my last post, I have a very nice Domino Reduction solve on the last scramble of the last round of the German forum comp.

Scramble: R' U' F L F2 R' U2 B2 U2 L R2 U2 F2 L2 B L' D U' F U2 R F2 U R' U' F
Solution: R2 U R2 U' D2 B2 F2 U' B2 R2 D2 R B D B2 L2 D' L2 B2 L2 D2 F' (22)

All on inverse

F D * R2 U' F' //EO (5/5)
R' //CO (1/6)
* = D M2 D' //Domino reduction (4-1/9)

Rewrite:
F D2 R2 L2 U' R2 D' B' R' //DR (9/9)
D2 R2 + U' L2 //Corners (4/13)

+ = B2 U S2 U' B2 //solve 2 edges and centers (6/19)

Rewrite:
F D2 R2 L2 # U' R2 D' B' R' //DR (9/9)
D2 R2 B2 U F2 B2 D' $ B2 D' R2 //All but 6 edges (10/19)

# = R2 B2 L2 D L2 B2 R2 U (2)
$ = D' U R2 U' D B2 (1)

Two lucky official solves in a row, aka getting lucky isn't a crime.

Spoiler: scramble #1 (27)

Scramble:
R' U' F R B2 D2 F2 L2 B2 R F2 U B R U R2 D' L U L2 R' F2 R' U' F

(F2 D R F') // 222 (4/4)
U L B2 D L D' // 223+eo (6/10)
B U B' U' // pF2L (4/14)
rewrite:
(F2 D R F' U2 B' U) // 222+adjust (7/7)
U L B2 D L D' // 223+eo (6/13)
B U2 B' U2 // F2L; ab4c (4-1/16)

Skeleton: U L B2 D @ L D' B2 U B2 U2 B U2 F R' D' F2
@ = B L F L' # B' L F' L' // 2 cancel
# = L B R2 B' L' B R2 B' // 3 cancel (11/27)

Kinda tunnel-visioned into trying to solve F2L, even though this should "obviously" have been done as ab4c directly. The first insertion I found was 3 cancel + 0 cancel; I had plenty of time left so I just tried other insertions. I normally don't bother with alternative insertions because I'm so slow at insertions.

I know an RUD alg for the ZBLL case in the B U B' U' version of F2L, but it's 13 moves (+1 move AUF) long, for a total of 29 moves. I didn't know at the time whether the RUD alg is optimal, but I just checked and it is. There's a different 13-move RUD alg that will avoid the AUF, but that would still be 28 moves total.

Spoiler: scramble #2 (24)

Scramble:
R' U' F L2 D' R2 B2 D' R2 U F2 U2 R2 U R B R2 U' L D2 B2 R2 U2 F' R' U' F

(U B' D U F2 R B2 U') // p223 + stuff (8/8)
U' B U' // adjust + EO (3/11)
L' B L' B // ab4c (4/15)

Skeleton: U' B U' L' B L' B U @ B2 # R' F2 U' D' B U'
@ = U' B' D2 B U B' D2 B // 5 cancel
# = U R' D2 R U' R' D2 R // 2 cancel (9/24)

Like for scramble #1, I initially found worse insertions that led to a 26. I found the 26 very early, and I spent like 30+ minutes trying to find better skeletons; when I gave up on that, I looked for alternative insertions and found this 24.

Didn't find a good solution for #3, so whatever. "Lucked out" on a 28-move ab3c (insertion cancelled two moves) near the end of the hour, because my backup solution was 40 moves long (lol). It's still a good mean by my standards.

27.00 mean at Singapore Championships
1)28 moves
R' U' F R B2 D2 F2 L2 B2 R F2 U B R U R2 D' L U L2 R' F2 R' U' F

Spoiler

B' L U' F **//EO+sq (4/4)
U2 B2 R D' (F2)//223 (5/9)
R' U2 * R' U'//2e4c (4/13)

*=B2 L' D2 L B2 U2 L F2 L' U2 R//to 3c (11-3/21)
**=F L2 F' R2 F L2 F' R2//rip (8-1/28)

Thoughts: I spent too much time on that 9 move EO223 with 2 pairs. Should have tried other things. Also I wrote that T perm wrongly at least 5 times during the attempt...

2)26 moves
R' U' F L2 D' R2 B2 D' R2 U F2 U2 R2 U R B R2 U' L D2 B2 R2 U2 F' R' U' F

Spoiler

(F) F D' F//EO (4/4)
D2 R//sq (2/6)
D' R' (L D2)//223 (4/10)
(L U L')//3c5e (3/13)

I found 2 26s from here but I can't remember which I submitted, IF says 27

F D' F * D2 R D' ** R' L U' L' D2 L' F'
*=D' F2 U F2 D//to 2e2c (5-1/17)
**=B2 L U' L' B2 R2 D' R' D R' (10-1/26)

F D' F D2 * R D' R' L U' L' D2 L' F'
*=D L2 U' L2 U L2 ** D' L2//to 3e (8-1/20)
**=L2 U' L' U' L U L U L U' L (11-5/26)

Thoughts: I found the same 223 as xyzzy but not the 5c skeleton...

3)27 moves
R' U' F U' R2 U' R2 U' L2 R2 F2 D2 U' R2 F' U L2 R U' F' U2 B L' D2 R' U' F

Spoiler

(L2 B' U)//EO (3/3)
(L' D2 B)//square+random D2 (3/6)
(R' F L2)//9 move 222 xd (3/9)
(B2 U2 R') U2 R//F2L-1 (5/14)
L' B' L//3e3c (3/17)

U2 R L' B' L R U2 B2 L2 F' R B' D2 * L U' B L2
*=D2 B2 U2 ** R U2 B2 D2 L (8-4/21)
**=F R B' R' F' R B R' (8-2/27)

Reconstruction of my official 24.67 average (done at PoliMi Mental Breakdown) + video!

1.
Scramble: R' U' F R U2 B2 L F2 U2 F2 U2 L F2 L2 F' U' L B' D2 L2 B R2 B D R' U' F
Solution: R2 D' B' R F' R F' R' U' F R' F' R U R U' R F R F' R U F2 D' L' F' (26)

Spoiler

R2 D' B' R //2 squares + 2 pairs (4/4)
(F L D F2) //Pseudo 223 (4/8)
F' R F' R' //F2L-1 (4/12)
(U' R' F R' F' R2) //F2L (6/18)
(R U R' U' R' F R F' U) //LL (9-1/26)

2.
Scramble: R' U' F L2 U R2 D2 B2 D' B2 U B2 U' F U' B2 R B F' U' L' D2 U' R' U' F
Solution: F2 D' B' L F2 U' F D F' D2 F' R2 F U L' F R2 F' L F R2 F2 B (23)

Spoiler

5 minutes 26 backup:

F2 D' B' L //EO + pseudo 222 (4/4)
U2 B' D B U2 //Insert edge (pseudo 223) (5/9)
F D' F D' F D' B //F2L-1 (7/16)
F2 D' F D //Pair (4/20)
U F' D' F D U' //Skip (6/26)

23:

F2 D' B' L //EO + pseudo 222 (4/4)
(B') //222 (1/5)
F' D F' D2 //223 (4/9)
(F U' F' R2 F U) //4c (6/15)

Skeleton: F2 D' B' L F' * D F' D2 U' F' R2 F U + F' B
* = F' U' F D F' U F D' (1)
+ = L' F R2 F' L F R2 F' (7)

3.
Scramble: R' U' F U' L2 U R2 B2 D' R2 F2 D B' U' R' B' L U' L2 D' B2 D' R' U' F
Solution: F' U2 R2 B' L2 B R2 B' R2 D' B2 L U' L2 F' U' F D2 F' U F R' D' R U2 (25)

Spoiler

F' U2 * B' //EO + 2 pairs (3/3)
R2 //Square (1/4)
(U2) //One more pair (1/5)
L2 D' B2 //2 more squares (3/8)
L U' L2 + //"Diamond" (3/11)
D2 R' D' R //4c (4/15)

* = R2 B' L2 B R2 B' L2 B (4)
+ = F' U' F D2 F' U F D2 (6)

FMC Europe 2019 winning solutions
24, 30, 25 = 26.33 mean

1. R' U' F L B2 U2 F2 R' F2 U2 F2 R2 B2 F' R2 U R F2 D R' U' R B' R' U' F

Spoiler

24:
R2 B' R L F' //EO
U' (B2 U' R) //pseudo 223
(B2 L' D') //12 to 5e4c (but I thought it was 4c4e until after the attempt...)

Skeleton: R2 B' R L F' U' D L B2 R' U & B2 *
* L2 U R' U' R U L2 //19 to 3c
& U F U' B2 U F' U' B2 (3 cancel)

Solution: R2 B' R L F' U' D L B2 R' U2 F U' B2 U F' U' L2 U R' U' R U L2 (24)

Notes: Overall a very lucky solve on a bad scramble. It's mainly lucky considering I would have never checked the skeleton if I knew it was 5e4c. I only had a 32 before this, so it was a godsend.

2. R' U' F D B2 D R2 F2 R2 D' B2 R U R' B' D F2 D' F R' F R' D R' U' F

Spoiler

30:
L2 U' D' //square and pseudo square
(R2 L2 U L D2) //223
R2 U F U' F2 R //F2L-1
L' U L U' F' U' F U //22 to 3e

Skeleton: L2 U' D' R2 U F $ U' F2 R L' U L ^ U' F' U' F U D2 L' U' L2 R2
$ F2 Fw2 (2-1)
^ L F L' F2 Fw2 L F' L' (8-1)

Solution: L2 U' D' R2 U F' Fw2 U' F2 R L' U L2 F L' F2 Fw2 L F' L' U' F' U' F U D2 L' U' L2 R2 (30)

Notes: Didn't like the scramble much again, although I wasn't expecting a nasty insertion like this. I think there may have been a normal comm that cancelled 2/10 somewhere, but this was cooler so I kept it. Fabio Schwandt also had 22 to 3e on this solve, but got a 24

3. R' U' F U2 R D2 B2 L D R2 U F2 D2 B2 D2 L D' R' B R' U' F

Spoiler

25:
(U') F2 R F' //square and pairs
R2 F' D' R // 123
F U2 F R' //222
F D F L2 F' L' D L D F' //22 to 3c

F2 R F' R2 F' D' R F U2 F % R' F D F L2 F' L' D L D F' U
% F L2 F' R' F L2 F' R (5 cancel)

Solution: F2 R F' R2 F' D' R F U2 F2 L2 F' R' F L2 D F L2 F' L' D L D F' U (25)

Notes: I feel very bad that this was how I won... Daniel Sheppard had an 18 to 3c skeleton on this scramble with no cancellations and definitely deserved the win more than I did.

It will be a 1 hour attempt on a random cstimer scramble. I will use the blackboard in my office, hopefully you will be able to see what's going on
I don't plan to talk much during the attempt, but I will try to tell you what I'm doing every now and then. Then we can comment how bad I was in the live chat.

As far as I know, this is the first time someone does something like this, so I thought it was worth posting it here. I'm sure the streaming will not be perfect, but if people like the idea I will try to do this again (or someone else might want to try with as well).

It will be a 1 hour attempt on a random cstimer scramble. I will use the blackboard in my office, hopefully you will be able to see what's going on
I don't plan to talk much during the attempt, but I will try to tell you what I'm doing every now and then. Then we can comment how bad I was in the live chat.

As far as I know, this is the first time someone does something like this, so I thought it was worth posting it here. I'm sure the streaming will not be perfect, but if people like the idea I will try to do this again (or someone else might want to try with as well).

B R' F' D // EO
B F' U2 R' // 2x2x2
F L // P2x2x3 Premove L2
U2 L F2 L' U2 // F2L-1
F2 R' F R F' // All but 5C

Skeleton: B R' F' D B F' U2 R' F L U2 L F2 L' U2 F2 R' F R F' L2 (21)

not very great at this point

Insertion Finder:
B R' F' D B F' U2 R' F L U2 L F2 L' U2 [@1] F2 R' F R F' L2
Insert at @1: L B2 L' F' L B2 L' F
After the 1st insertion: B R' F' D B F' U2 R' F L U2 L F2 L' U2 L B2 L' F' L B2 [@2] L' F' R' F R F' L2
Insert at @2: F' R' F L' F' R F L
After the 2nd insertion: B R' F' D B F' U2 R' F L U2 L F2 L' U2 L B2 L' F' L B2 F' R' [@3] F L' R F' L2
Insert at @3: R2 F' L' F R2 F' L F

Solution: B R' F' D B F' U2 R' F L U2 L F2 L' U2 L B2 L' F' L B2 F' R F' L' F R2 F' L F2 L' R F' L2 (34)

FMC PB!!
Scramble-
R2 L2 U R' F L' F' R L2 U2 F2 U2 L2 B' L2 B' D2 F'
Solution-
R F2 U2 F’ R U y R’ D’ R U’ R’ D R’ U’ F2 U R2 D2 L2 F2 D’ L2 D’ R2 24 moves!

I don't think enough people know the power of Kociemba, it truly is amazing.