I think it is Whites move. I’d move Whites queen to threaten the black bishop (pining the bishop to Black’s queen) but I’ll bet that is not the game winning move lol.
http://www.chessgames.com/perl/chessgame?gid=1095025
Capablanca did exactly what you predicted:
Queen to F3, attacking the Black Bishop, pinning the Black Queen, protecting both white pawns on the G file, and doubling White's attack on the Black F pawn - truly an amazing move.
Capablanca still has a huge problem trying to develop his Knight and Rook on the left side of the board, which are pinned by Black's Queen and buried behind three White pawns. That takes about 10 more moves to solve.
Eventually, White breaks his B pawn loose and threatens to Queen it, at which point Marshall resigned.
I read some commentary on the game.
Marshall played a radical variation of the Spanish Opening that had never been analyzed before, except by Marshall.
The game is amazing because Capablanca did all his analysis over the board under time pressure.
Marshall, who was also seeing much of this for the first time, made two inexact moves that may have cost him the game.
It’s hard to decipher Assange’s meaning.
The black queen is not lost until the very end.
Is Obama the black queen? (Just sayin’.) The black queen is on the eighth rank, a very aggressive position.
With misplay by white (not likely at this level) black could mate in two even though down in material.
Instead, black resigns a few moves later in the face of certain defeat.