Black to move
As in the previous position, both the Qd7 and the Rc8 are committed to protecting the Re8: taking the "free" queen leads to a back-rank mate by force.
Torre played 20...Qb5.
White to play and win (still a few moves to go!)
I'll suggest a few moves: which do you think is strongest? Please back up your opinion with careful calculation of all the possibilities!