Although coming two rails out of the corner appears to be the consensus (and it is in no way a bad shot), hitting it with low outside affects two undesirable traits:
1) It plays a crossover pattern to the line of attack on the 6; and,
2) It plays the CB on a line traveling away from the 6.
Under the gun of competition, one is prone to speed errors and it is not uncommon to overcook the speed/spin on this and easily end up with the CB down the long rail from the 6 - or even somewhere frozen on the opposite end of the table.
If these are the last two balls on the table I'm taking the 4 rails because it comes into the line of the angle of attack, and even though there is more CB travel, it is actually more forgiving to speed errors.
In "The Pro Book" by Bob Henning, he says that when competing in this type of situation (if these are the last two balls on the table) that you should opt for the shot that lets out your stroke a little. It will loosen you up and demonstrate to yourself (and to your opponent) that today you came out to play.
If one has some 3c practice it seems to be quite a natural path with little chance of scratching.
since the 6 is close to the rail
you cant "cross over" a position zone unless you scratch in the side
also the 2 railer sends you towards the side pocket whereas the 4 railer sends you to the middle diamond above the dide pocket
ie farther from the 6
my 2 cents
i do like the 4 railer as an alternative because you could draw into the corner or 2 rail in the side pocket
but if you over cook the 4 railer you can come too far off the 4th raill an end up with a severe cut on the 6
if you have the skill the draw takes less power (more accurate)\
and leaves you closer to the 6
jmho
icbw
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