- 2♣ 6+ or 5C/4M, 10-15 pts
- 2♦ short diamonds (43)15, 4414, or 4405 shapes, 10-15 pts
I thought I had a neat new idea when I considered Pass(!) as the initial bid for both 2♣ and 2♦ hand types in 1st/2nd seat (standard precision openings would apply in 3rd/4th seat), although I found that it had been previously discussed here (impossible pass, 1435s). To avoid passing out "our" hand too often, I was thinking of opening all 8+ point hands in both 3rd and 4th seat (these minimal, possibly balanced hands would bid 1♦ 3+, 1♥♠ 4+, or 2♣ 5+). The relevant auctions to show these stronger passed hands would use a 2/1 bid of 2♣ or 2♦ as shown:
P-1♦-2♣ 10-15 usually 5+♣ (except for 4414), NF
P-1♦-2♦ 10-15 4+♦/6+♣ (inverted), NF
P-1M-2♣ 10-15 5+♣, no fit for major, NF
P-1M-2♦ Drury 3+M 10-15, forcing to 2M
P-2♣-2♦ asking bid, forcing to 3♣ (with 9+♣ fit)
Since I play a light opening bid system, the 2/1 bids by a passed hand cannot be "natural" in the sense that 10+ points and a 5+ suit would have already bid, so these 2/1 bids didn't have a good meaning before (aside from Drury).
Assuming a reasonable set of constructive continuations can be worked out, I was trying to understand the trade offs between these methods and playing normal precision.
Advantages of Passing with 2♣/2♦ hands:
+ 2♣ and 2♦ openings in 1st/2nd seat are available for weak preempts
+ better uncontested auctions since these hands will hear from partner about his best suit before bidding
+ 4-4 major suit fits can be found opposite hands too weak to move over a 2♣ opener
+ lighter bids in 3rd seat help with leads and annoy opponents
+ 1♦ opener in 1st/2nd seat can promise 3+ (instead of 2+) if we also pass with 3325 shapes out of NT range (ie 13-15 balanced, playing a 10-12 NT)
+ GCC legal (for those in the US that care)
Disadvantages of Passing with 2♣/2♦ hands:
- occasionally passing out "our" part-score hand with 14-15 opposite 6-7 pts
- loss of the precision 2♣ opening as preemptive/lead directing when it's the opponents hand (less true of precision 2♦)
- bidding by opponents may jam the auction before the strong passing hand can rebid (ie P*-(1♠)-P-(2♠)-AP )
- 3rd seat preempts might need to be more disciplined to cater to partner's possible values
- 3rd seat bidding with 8 point balanced hands could be risky when partner has a weak pass
- loss of 2♣ as a conventional 2/1 by PH (2-way Drury or whatever)
- 4th seat openings with minimal values could balance opponents into a partial when it was "their" hand (instead of being able to pass out)
Despite the longer list of disadvantages, I think preemptive 2♣ and 2♦ openers and improved uncontested auctions would provide net gains due to their high frequency, while the disadvantageous scenarios seem less probable (at least to me). Please help me add to my lists with any other good or bad points you can think of - suggestions for improving these methods are most welcome!