I am playing Neil Kimelman's FP, I am sure other BBF'ers have opinions on this and will express them but I have found
having these agreements is far superior to having none
It appears to be forcing, as in (ii) but as our auction started with a simple overcall I am not so sure.
Forcing pass (Neil Kimelman)
Forcing Pass Definition
When your partnership has made a bid that has created a game forcing auction, the opponents cannot play a contract undoubled.
1S (P) 2H (5D)
i) Besides hands where the partnership is in a game forcing auction, forcing pass also applies when one hand opens and the other hand shows at least invitational values.
1S (P) 3D* (5D)
ii) When your partnership bids game, and you are vulnerable versus nonvulnerable opponents.
V vs. NV (P) 1S (2H) 2S (4H) 4S (5H) ?
My partners and I play this is a forcing pass situation. At any other vulnerability it is not. This to me is a reasonable treatment, but may not be universal. The logic behind this agreement is that we should have extra values to bid game with a risk of being doubled for -200, -500 or more, versus 420 for the opponents.
iii) When the opponents preempt and your partnership bids game.
1H (3S) 4H (4S)
"And no matter what methods you play, it is essential, for anyone aspiring to learn to be a good player, to learn the importance of bidding shape properly." MikeH