Spoiler
It's not close... just put our backman up against a three point board, if that doesn't win most games, at least it wins a lot more gammons than any of the alternatives.
1. Cubeful 2-ply 8/3(2) 6/1*(2) Eq.: +0,4760
57,63 25,18 0,41 - 42,37 8,87 0,29
2. Cubeful 2-ply 23/13 6/1*(2) Eq.: +0,3604 ( -0,1155)
57,94 17,41 0,18 - 42,06 7,66 0,13
3. Cubeful 2-ply 23/18 13/8 6/1*(2) Eq.: +0,2883 ( -0,1876)
55,74 18,46 0,31 - 44,26 9,35 0,20
4. Cubeful 2-ply 13/8(2) 6/1*(2) Eq.: +0,2662 ( -0,2097)
54,60 19,66 0,25 - 45,40 8,99 0,19
5. Cubeful 2-ply 13/3 8/3 6/1* Eq.: +0,2029 ( -0,2731)
52,98 19,54 0,41 - 47,02 10,53 0,35
6. Cubeful 2-ply 13/3(2) Eq.: +0,1828 ( -0,2932)
53,04 17,75 0,34 - 46,96 9,71 0,28
7. Cubeful 2-ply 23/8 13/8 Eq.: +0,1825 ( -0,2935)
54,56 12,97 0,19 - 45,44 8,73 0,15
8. Cubeful 2-ply 23/18 13/3 8/3 Eq.: +0,1796 ( -0,2963)
53,71 16,59 0,47 - 46,29 10,52 0,29
9. Cubeful 2-ply 13/3 6/1*(2) Eq.: +0,1753 ( -0,3007)
51,93 19,51 0,31 - 48,07 10,90 0,36
10. Cubeful 2-ply 23/13 8/3(2) Eq.: +0,1618 ( -0,3141)
53,42 14,74 0,24 - 46,58 9,36 0,24