Jamboree: "Bigfoot713: You suggest a move for black; it's already lost when the queen gets trapped."
Well, all sorts of moves other than 19. ... 0-0 save the queen. And while admittedly black may be worse (pawn down, less space, fewer attacking chances) so much so that against a 2800 player the position is essentially "lost" in the long run, it'd certainly be better to fight on with a queen than without one.
Among many other moves which save the queen, black has 19. ... BxN, or 19. ... e5, or 19. ... h6, or 19. ... Ne4, etc. etc.
I'm not saying any of these are "good" or save the game in the long run, but they are certainly better than hanging a queen outright.