I found the screen shot of the situation we are talking about -- you make the call!!
to suki, frank and the chest puffers
here is how you figure out approximately what is the right shot.
forget about shooting for the win. or playing safe because it is for a lot of money. it all comes down to which shot gives you the highest % chance of winning the game. ( Not necessarily, the weaker the players the more the bank shot is the right shot but that doesn't mean that the bank shot is the better option in this match up)
so here goes-- john said he was 70% to make the spot shot. so he is 30% to miss. 70% he wins right there and 30% they play for the two balls. john will win say 50% of those times as he has only one to make but he is second to shoot. that is an estimate depending on how the balls lay. so john wins 85% of the time. that is the 70 plus half of the 30%. ( John will win 70% of the time by pocketing the spot shot, when he misses the spot shot he's still a favorite needing only one ball to his opponents two balls. However, when he misses the spot shot he may give up a return shot...but not likely...I would still make John a 3/2 favorite when the spot shot is missed. Which would put John at an 88% favorite to win the game by shooting the spot shot.)
now if he plays safe. say he makes the bank 30% and misses safe or close to that 70%. he should win say 60 % of those times he misses since he played more safe than the spot shot. so 30 plus 42 (.60 of 70%) = 72%.
so in my book the spot shot is right. however you adjust those % based on how the balls lay and how he will likely leave the table.
overall it gets close to which shot is best.
Another factor when deciding to shoot would be to determine the strength of your opponent. The weaker your opponent is the more the bank is the better option. If I were playing Pagulayan i'm shooting the spot shot in a heart beat. However, if i'm playing a player like The Beard i'm banking the ball.:sorry
Another factor that hasn't been discussed is ..the position of the second ball... When John shot the bank shot the second ball was positioned high on the side rail fairly close to the rail. Considering the placement of the ball imo the bank is a very low% shot, matter of fact from the angle he shot from, it was very unlikely for John to have made the bank...he was playing 90% safe as opposed to playing for the win. Now if the second ball was positioned another foot lower than the original position, then the bank now becomes more makeable with a natural safety built in. From this position the bank now becomes the better shot, imo.
Dr. Bill
The spot shot has a lot of pitfalls not mentioned especially after playing for three days.
First if missed and you give up a shot on it mainly because of the speed required to draw to the long rail and set the cue o the short rail. That ball could wind up anywhere. If your opponent makes it which ever way he already has the other ball on his side of the table for a possible win. Even if he doesn't get a shot you will more than likely lose table advantage. I would never shoot it like Suki suggested and run the cue ball all over the table.
Second and worse would be to dog the stroke and scratch or miss cue.
Third would be to double the points of the pocket and leave the ball there for a bank and possible loss of game or it may go toward his pocket.
After playing for so long and having missed a number of shots because of the tight pockets John didn't even hesitate to position for the bank. Not once did he even consider the spot shot.
For that situation I believe the bank is the shot.
You can position cue ball as desired to start.
You can either make the bank or get it close and maintain table advantage.
You can take the cue ball uptable and force him to dig the ball out while not give up a shot on it or the spotted ball.
I don't know about all that math, and I'm sure it has some merit but I do know what I like.
Another reason I like Johns shot is because I believe he won the game and that is what really counts.
'nuff said
Pay attention in the video Ghost posted to where the cue ball ended up after my bank. Up table near the rail. He had no option for a bank shot on either ball and opted for a very aggressive shot cutting in the spot shot and possibly making a game winning shot by knocking the ball by my hole (left there by my bank) into a position for a shot if he made the back cut.
I had probably missed 20 cross banks in the session and drilled the last spot I had into the rubber. I would not have shot the spot shot at that point, after being revived from the dead, with a gun at my head. The angle I took had a lower percentage to make, but was one I was confident I could get the cue ball up table near the rail, and the object ball near the hole.
The shot did what it was designed to do. Get me a better shot to win the game.