For the sake of getting quickly to the point, Black's Queen gets boshed, for no material gain ... (DON'T do this in a real game!)
With BOTH Queen's Pawns captured and off the Board, we now have our first, fully Open File - the d-file.
You can see the difference between the Open d-file and the Half-Open e-file, where the latter still has Black's Pawn in defence.
From White's perspective, his King is now in "Check" ...
In addition, as well as the two White Pawns, either side of the Black Queen, White's Queen and Queenside Bishop are also being attacked, by Black's Queen.
As for White's concerns about the Open d-file, at present, White's Queen cannot directly patrol the length of it, as Black's Queen is defending it - albeit, somewhat suicidally ...
From Black's perspective, his Queen's control of the the Open d-file is about to be mercilessly brought to an end ...
With the Black Queen (tongue-in-cheek) captured, there is now a CLEAR PATH from Rank 1, on the d-file; all the way up to that fizz-bang, white-blue explosion, up on Rank 8, on the d-file ...
If it wasn't, er, 'clear' before, it's obvious, now, why such a File is known as an Open File.
From White's perspective, his Queen currently has a strong presence along the Open d-file ...
As things stand, Black's King CANNOT cross over to reach the c-file - were it free of the Black Bishop - as Black's King would have to pass-through an attack by White's Queen ...
That would be "Check" and it's FORBIDDEN to deliberately put your own King in one.
From Black's perspective, he's now at a noticable disadvantage, especially with that gaping chasm in the Queenside defences AND the fact that White still has a Queen, in addition to the two White Rooks - both of which are long-range, File-attack specialists.
Black would need to make temporary arrangements to defend the gap, by either placing his Queenside Bishop, or Knight, in the opening - that d7 square - until the rest of his troops can be deployed ...
Black's best option, here, is - after clearing his Kingside Bishop and Knight, down the Board and out of the way - to try and quickly Castle Kingside, which will, in one fluid motion, get his King to 'relative' safety, while getting his Kingside Rook into a more-active role, where it can better defend and - maybe - go on the counter-attack.
(If you don't know what Castling is, Click Here!).
Anyway, that should've tied-up nicely all this malarky about Ranks, Files, Half-Open Files, and Open Files.
