megaminx calculations with twsearch
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2 faces    ??
3 faces    24 or more possible
4 faces    26 finished
5 faces    18 
6 faces    18

***trying to calculate (BL U2 BR)9 in an effort to find a shorter solution, nothing up to 22

6 faces look for improvements to 16 move processes
5 faces look for improvements to 18 move processes
4 faces look for improvements to 20 move processes

<2U, 2L, 2BL> E5200 can do up to depth 18

2R,Y,Z   T3600 can do up to depth 27 (searching for 10 checkerboard)

using google compute with 16 core and 64 gig memory
depth 23 using 2U, 2L, 2F

using dell t3600 
depth 24 using 2L, 2R, 2F

5 faces 20 moves possible
(2U2 2L2)17  irreducible

depth 35 using 2U, 2F
depth 36 using 2U, 2L april 11, 2021, twsearch 0.2

(2R 2L)180   16 flip, nothing up to depth 34

(2R 2L)34    can't reach 10 spot

10 faces to depth 14

recommended searches for gc with 24 core:

3 faces with 24 turns or less
4 faces with 22 turns or less
5 faces with 20 turns or less
6 faces with 18 turns or less