the Italian Bridge Federation allows to play in low-mid flight tourneys only two systems to the same couple.
That means that you can have one system, say, when vuln, and another when NV;
or, alternatively, you can play one system when passed hand (or just 3rd seat if u like) and another when unpassed hand.
But you cannot combine the criteria: combining vulnerability criterion with 1st/2nd seat vs 3rd seta criterion, you get 4 different systems (one at red unpassed hand, one at red, passed hand, one at green unpassed hand, one at green passed hand).
----------------------------------------
Now, as you probably know by now, I am starting a Precision system with my teammates with
- mini 1NT range (10-12)
- 1D 13-15 bal or < 16 unbal + diams
- 2C may have 5C+4M
- multi 2D = weak 2 major or 18-20 4441
- 2H = 4441/5440/5431 short in diams ( no 5cM)
- all strong hands (except 18-20 4441) go through 1C, so 2NT is free for other uses
I would like to differentiate the system according to vulnerabilty or seat, but I cannot do both
a ) Points in favor of changing system according to vuln:
I'd feel much safer to use a variable NT range (10-12 green, 14-16 red)
b ) points in favor of changing system according to seat:
choosing a more preemptive style in 3rd seat, constructive in 1st and second seat.
I would love to play Bergen's "2-under" preempts (e.g. 2♠-> sound or wild preempt in ♣; 2NT -> sound or wild preempt in diams, and so forth), in 1st-2nd seat. This way I could prempt much more often i first-second seat without having a partner with a good hand guess if I opened with rubbish or with a good suit: he would have a relay step to ask the quality of the preempt.
On the other hand, in 3rd seat I would love to just bid the suit of the preempt without worrying of preempting pard ( he is a passed hand).
Also, I am bit worried of opening 10-12 NT in 3rd position, even at green.
SO, MY FRIENDS, HAVING TO PICK A SINGLE CRITERION, WHAT WOULD YOU CHOOSE BETWEEN SEAT AND VULNERABILITY AS A SINGLE CRITERION FOR HAVING A VARIABLE SYSTEM ?

Help
