Attached is a diagram showing this HO situation. The scale is based on a TAS of about 300KTAS, the radii represent a radial G of about 4.
At 300KTAS, the turn radius is about 2000'. Velocity is about 500fps.
If the bandit begins his pull at the ranges given in the previous posts (800-900 yards), then he is pulling up at a range greater than his (and the adversary's) turn radius.
If the adversary begins his pull immediately after seeing the other pull up, the situation in the diagram exists. If he does not, and instead flys straight through, then the bandit will indeed have an opportunity to roll out on the adversary's high six.
Imagine this turning plane in the horizontal instead of the vertical. Would you still maneuver like this? In a horizontal plane, does this look like a good idea? I don't think so...the orientation of the turning planes has nothing to do with the validity of the technique.
Now, let's talk about net lag. If this aspect of on-line flying can result in the adverary continuing straight ahead with the bandit still at his twelve o'clock when in fact the bandit has already pulled up into the vertical...then we no longer have a 'realistic' BFM environment. If both pilots are not 'seeing' the same thing, then how in the world can anyone represent this as 'BFM'?
Net lag may be a factor beyond our control. If this lag results in significant disparities in what opponents 'see', then these problem areas need to be clearly identified to all players. Not doing so invites an opportunity for an advantage being conferred that has not been earned.
SFRT - Frenchy
BFM is BFM, regardless of what you fly. Modern jets do have certain capabilities that WW2 fighters did not have...but this is irrelevant to our discussion.
Your 'arbitrary' choice of range is not insignificant. BFM is about performance numbers...for a given number, certain expectations can be assumed. Change the number, and expectations change.
You will only 'beat (your opponent) to the top' if you can exceed his turn rate, OR he turns late. In this situation, it does not make any sense for the adversary to continue straight through while letting you pull up behind him (unless, because of net lag, he doesn't see that you have pulled up.)
The bottom line here is that when someone posts specific numbers regarding BFM technique, then these numbers had better be verifiable. Turn performance is about true airspeed and radial G, period.
There are no 'Gee whiz, I wish you were dead' BFM maneuvers...lift vector control and energy management combined with timely decision making are the controlling variables.
Andy