When your opponent is on a foul, and the rack is unbroken, and you have ball in hand, it is never the right shot to play a safe off the rack. You may get a safe sometimes, but the percentages are against you. None of the old time players would ever shoot towards the balls in that situation.
The goal of the shot you do shoot is to leave the cue ball frozen to the center of the head rail. The two standard ways to do that are to play the cue ball two cushions off the foot rail/side rail (just missing the rack) or to do as Balsis did.
Bob---
I see a lot of people do just as you described -- taking an intentional and not touching the rack, basically going two rails trying to kiss the CB to the center of the head rail.
If you actually DO that, it's devastating to your opponent.
In practice, however, it's really tough to get to that exact point. If you lose the CB just a hair and end up to one side or the other, you leave yourself vulnerable two shots later if they come behind the rack "well." If that happens, you now have to shoot out of it without selling-out on the balls they just opened-up.
Even if you get to the center of the head rail, but don't kiss and give-up the bottom of the CB, you can respond with this:
http://www.youtube.com/watch?v=genwjANodF8
I guess my point is unless you're really good at getting that CB to the center of the head rail, isn't it better to just take the intentional and come from behind the rack and just move a ball or two out? If you do, now's there's a threat from sending the CB back into the kitchen.
I suppose the reasoning of not touching the undisturbed rack is so you don't have a ball sink on you when coming from behind. But, if you're really comfy with not selling out in that fashion, isn't it better to leave the opponent in a guaranteed stuck position with balls spread?
Or, another could be if you're playing an idiot who thinks they have to make a good shot, they might try to clip the corner ball and try something similar to an opening break and leave you a follow-up shot. If you're playing an idiot, however, what are the odds of them beating you to begin with -- so why not come from behind the rack to begin with in order to put yourself in position to put up a score?
I hope all of that makes sense. I always thought the first person to have a non-kissing shot with balls spread has the % advantage -- and that would be you if he dogs his first shot off the back of the rack.
Your thoughts?