Also with e4 b5, a6 is blocked for the bishop
same for d4 g5
Wow, nice remark! I'll correct it. 😎
Done. Now we should calculate it for 1. a3 - 1. h3 as well as for 4 knight moves.
Ok not today
e4 d5 nc3 and nc3 d5 e4 are counted as seperate, when they are not
The question of transpositions will be settled later (cf. the first post).
From 1. a3-h3 is 3598 moves
All right, we will believe U.
1.Nf3 xx is 5+1+14+2=22 x 20= 440
same for 1.Nc3
1.Nh3 xx is 3+1+14+2=20 x 2-= 400
same for 1.Na3
so 3744 + 3598 + 1680 = 9022 openings after 3 ply
Also with e4 b5, a6 is blocked for the bishop