[kgr]

1x-1/2y
1/2z
How much do you loose to play 1z or 2z always forcing and use the jump for e.g. a splinter.
e.g:
1♣-1♦-2♥ = splinter with fit ♦ and 12-14 or 18-19 HCP
1♥-1♠-3♣ = splinter with fit ♠ and 12-14 or 18-19 HCP
1♠-2♦-3♥ = splinter with fit ♦ 15+ HCP

[benlessard]

I think that with the minimum hand just making the simple raise will lead to equivalent results. You might miss magical game but youll avoid going down at the 3 level for no reason.

With the monster hand you just JS in the fragment and return in partner suit, sometimes partner raise you fragment and its not perfect but on the long run youll do ok.

However what i strongly believe is that

1m-----1S
2H

and

1C-----1H
2D

here both of those bid can be used as artificial raise to allow to show the 2 & 1/2 raises and still stop low.

As for

1m---1red----1S as forcing i have no strong conviction. Some say that 1S rarely never go all pass but at the same time i like that my 2S is showing extras instead of a forced bid again you ll avoid playing 3 will compensate for some touhg hand if 1S isnt forcing.