If engines have some Book of debutes then they may choose a move only because it was played and have some winning history... Anyway, what engines say about Qd6? What evaluation?
It's not even in Komodo's Top 8 moves. After Qd6 it proposes 7.Nf3 +1.80.
However, it thinks it's quite playable before it reaches 18 ply, which means it's a good move for us humans.
If engines have some Book of debutes then they may choose a move only because it was played and have some winning history... Anyway, what engines say about Qd6? What evaluation?