Trying to tie up the twelve doesn't seem to have any prospects against a good tactician. First of all, if you get it wrong and leave a shot on the shot in the bottom right or the top left, it's an easy runout. You could never freeze the twelve here without knocking in the eight, but let's say you hit it well enough that there's no shot on the twelve. I'll play safe, leaving the nine on the bottom rail and sticking the cue ball on top of the twelve. Now, you couldn't hiot the eight if I gave you 1,000,000 tries, and when I get my next ball in hand, I'll always be able shoot the nine in the corner and break out the twelve, which should leave an easy runout.
Against a good tactician, the masse is probably your only chance to win. If opponent left anything but this, they played a very poor safety, and from here you need a miracle to win this rack.