kenberg, on Nov 18 2009, 07:49 AM, said:
A corollary would be that if opener has, say, 1-3-6-3 shape and thinks 5H over the 4S is reasonable (if responder thinks 4H is reasonable opposite a flat 13 then this shape and a little extra might well make 5H right) then opener has to bid it because responder will not treat a pass as forcing.
Yes this is perfect, you knew the answer, it's just hard to believe it's that simple
Admittedly there are some situations which are debatable which could be played either way, and having a firm agreement in place is good. My agreement with all of my pards is if it's not obvious that it should be a forcing pass, it's not. Pretty simple. I also had an agreement once that white/red there is no forcing pass (but this is a bad agreement to have vs bad opps).
But 99 % of these forcing pass situations that people discuss are just clearly not forcing passes, and they're getting to muddled up in them to see the logic that you so aptly described in your post.
Re Kantar- Obv he's a great player but I disagree with a ton of his FP rules, and I think at times they violate "common sense." and are possibly outdated. But it can never hurt to have good firm rules with your partners about forcing passes, especially if you're both comfortable with them (as you might tell by now, I'm not comfortable with a lot of them).
Kokish, another great player and theoritician also advocates more FPs than most. So obviously you can choose to ignore me and listen to those guys

I would say in recent times the number of auctions people play as forcing has gone down, which makes sense as the level of competitive bidding has gone up (now at top levels it's very common to see both sides bidding on every hand, frequently both of them bidding game! No one ever knows whos hand it is).
1♦ P 1♥ X
XX 3♠ 4♥
4♠ P P ?