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Using the kind of standardish 2/1 system I have tended to play with non-regular partners, maybe 2♣(1)-2♦(2) 2♥(3)-2♠(4) 2N(5)-3♥(6) 3♠(7)-4♥(8) 4N(9)-5N(10) 7N(11)-P (1) strong (2) waiting (3) Birthright ("Kokish") (4) waiting (5) BAL GF (6) Jacoby transfer (7) S support (8) H control, serious slam interest (by failure to bid 3N - Non-Serious), no C or D control (9) RKC (10) even number of key cards, some void (which can only be in H) (11) contract ?

But maybe because of vagueness? "5+ diamonds" = ? [♦xxxxx and ♦KQJTxx both ok?] "good spades" = ? [♠Axx and ♠xxxx both ok?] "short hearts" = ? [singleton and void both ok?] "slam interest" = ? [AJx x AQJTx xxxx and AJxx x AQJTx Kxx both ok?] Is AJx x AQJTx KJxx a possible hand?

Then, if 1N-2♣ = GF relay, maybe 1N-2♣; ?: 2♦ = 5+ C, not high (= S) shortage if 4 H ...2♥ = relay ......2♠ = 4H5+C, low (= D) or even shortage ......2N+ = 4S5+C 2♥ = 4S5+D 2♠ = 4H5+C, high (= S) shortage 2N+ = 4S5+C ?

6NT

Not true! :) Other systems: Arno Club (= Little Roman) Boring Club Midmac Moscito (Honeymoon, 90s, Terrorist, ...) Vienna

https://www.bridgebase.com/forums/topic/84904-modern-moscito-limit-openings/

In particular, why is it ok that 1N in 3rd/4th includes hands with a major? A Scamp-like system with 14-16 NT also in 1st/2nd seat: 1st/2nd seat: P: includes 11-13 BAL 1♣ = Scamp 1♠ except unBAL OR Scamp 1♣ except 17+ if BAL 1♦ = Scamp 2♣, 2♦ or 2N 1♥ = Scamp 1♥ except unBAL* 1♠ = Scamp 1♦ except unBAL* 1N = 14-16 BAL 2♣+ = weak preempts P-?: 1♣ = 8-10 BAL(ish) OR Scamp 1♣(3rd/4th) ...1♦+ = e.g. as in this post, but likely simplified depending on which hand types have been denied by the initial P 1♦+ = Scamp(3rd/4th) (or Precision) 1♣-?: E.g. as in post #15 above, which is something like It might help, especially over 1♣-1♥, that Opener's Scamp 1♠ type hands are always unBAL, though. 1♥-?: (...) 1♠ = < GF relay ...E.g.: ...1N = Scamp 1♥-1♠; P except unBAL ...2♣+ = Scamp 1♥-1N; 2♣+ (except always unBAL) 1N = GF relay** (...) 1♠-?: (...) 1N = GF relay** 2♣ = INV relay ...2♦ = 4 S ...2♥ = Muiderberg ...2♠ = MIN, 6+ S ...2N+ = MAX 2♦ = < INV, P/C ...P = 5+ D ...2♥ = Muiderberg ...2♠ = 6+ S ...2N = 4144 ...3♣ = 5+ C (...) 1M-1N; ?: 2♣ = M+D 2-suiter 2♦ = M+C non-reverser 2♥ = M+C reverser 2♠ = M+C+D 3-suiter 2N+ = M 1-suiter (6+ M) * But hopefully it's ok to use 1N as the GF relay after all BAL hands are removed from 1♠. The resulting structure is +0. ** But now 1N (over 1♥/1♠) instead of 1♠ (over 1♦/1♥).

Why do you switch to a Precision-like opening structure in 3rd/4th seat?

I enjoy your book! Idea: 1♣ = Scamp 1♣ or Scamp 1♠ 1♣-1♦; 1♠ = Scamp 1♠ possibly with a wider range (say "11-18" instead of "11-15") 1♣-1♦; 2♣+ = Asptro or better NT defence, possibly excluding major 2-suiters 1♣-1♥; 1♠-1N/2♦+ = Scamp 1♣-1N/2♦+ 1♣-1♥; 1N+: takes care of all Scamp 1♠ hands (e.g. by simply letting 1♣-1♥; 1N = original 90s Moscito 1N) 1♣-2♦ = 8+, either S+H reverser or 5+S5+H (can afford to use 2♥ as a GF relay over this because of the guaranteed 9c+ H fit opposite the Scamp 1♠ type) 1♣-2♥ = 8+, S+H anti-reverser (can afford to use 2♠ as a GF relay over this because of the guaranteed 9c+ S fit opposite the Scamp 1♠ type) 1♣-2♠+ = Scamp 1♣-1♥; 1♠-2♠+ (9+c S fit guaranteed) 1♠ = Scamp 2♣, Scamp 2♦ or Scamp 2N 2♣+ = weak preempts

Suppose that in 1st and 2nd seats there are ways to open all 6+ M3-OM and 7+m3-S3-H hands that would be worth a GF response to a strong 1♣ of type T by partner.* If P-1♣ = weak NT w/ no 5c M OR type T strong 1♣, then it looks to me that after a positive (= GF opposite the type T strong 1♣) response the following structure is both pretty much +0 and allows the partnership to find all 4-4 major partials: P-1♣; ?: 1♦ = negative 1♥ = positive, either 4 S, S+H 2- or 3-suiter or minor 1-suiter w/ "high shortage" (13(63), 22(63) or 23(62)) ...1♠ = 4 H or strong ......1N = 4S3-H .........P = weak NT .........2♣ = GF relay ............2♦ = BAL ............2♥ = S+C reverser ............2♠ = 3-suited, short H ............2N+ = S+D reverser .........(...) ......2♣ = S+H 2-suiter .........2♦ = GF relay .........2♥ = weak NT (and 4 H) .........(...) ......2♦ = 4423 or S+H+C 3-suiter .........2♥ = weak NT (and 4 H) .........2♠ = GF relay ............2N = 4423 ............3♣ = 4414 ............3♦ = 4405 ............3♥ = 4504 ............3♠ = 5404 .........(...) ......2♥ = 4432 or S+H+D 3-suiter .........P = weak NT (and 4 H) .........2♠ = GF relay ............2N = 4432 ............3♣ = 4441 ............3♦ = 4450 ............3♥ = 4540 ............3♠ = 5440 .........(...) ......2♠ = either 1336, 2236 or 2326 (C 1-suiter, "high shortage") .........2N = GF relay ............3♣ = 1336 ............3♦ = 2236 ............3♥ = 2326 .........3♣ = weak NT .........(...) ......2N = either 1363, 2263 or 2362 (D 1-suiter, "high shortage") .........3♣ = GF relay ............3♦ = 1363 ............3♥ = 2263 ............3♠ = 2362 .........3♦ = weak NT .........(...) ...1N = weak NT, < 4 S ...(...) 1♠ = positive, either D+C 2-suiter or BAL w/ no major ...1N = weak NT ...2♣ = GF relay ......2♦ = BAL ......2♥ = D+C reverser ......2♠ = 5+D5+C ......2N+ = D+C anti-reverser ...(...) 1N = positive, 4H3-S ...P = weak NT, < 4 H ...2♣ = GF relay ......2♦ = BAL ......2♥ = H+C reverser ......2♠ = 3-suited, short S ......2N+ = H+D reverser ...(...) ...2♥ = weak NT, 4 H ...(...) 2♣ = positive, either M+D non-reverser, 0544 or 5H(332) ...2♦ = GF relay ......2♥ = S+D non-reverser .........2♠ = GF relay ......2♠ = 0544 or 5H(332) .........2N = GF relay ............3♣ = 2533 ............3♦ = 3523 ............3♥ = 3532 ............3♠ = 0544 ......2N+ = H+D non-reverser ...2♥ = weak NT (P/C) ...(...) 2♦ = positive, either S+C non-reverser, 5044 or 5S(332) ...2♥ = GF relay ......2♠ = 5044 or 5S(332) .........2N = GF relay ............3♣ = 5233 ............3♦ = 5323 ............3♥ = 5332 ............3♠ = 5044 ......2N+ = S+C non-reverser ...2♠ = weak NT ...(...) 2♥ = positive, H+C non-reverser ...P = weak NT ...2♠ = GF relay ......2N = S (= high) shortage ......3♣ = even shortage .........3♦ ............3♥ = 2524 ............3♠ = 1516 ......3♦ = 3514 ......3♥ = 2515 ......3♠ = 3505 ......3N = 2506 ...(...) 2♠ = positive, either 3136 or 3236 (C 1-suiter, "middle shortage") ...2N = GF relay ......3♣ = 3136 ......3♦ = 3236 ...3♣ = weak NT ...(...) 2N = positive, either 3163 or 3262 (D 1-suiter, "middle shortage") ...3♣ = GF relay ......3♦ = 3361 ......3♥ = 3262 ...3♦ = weak NT ...(...) 3♣ = positive, 3316 (C 1-suiter, "low shortage") ...P = weak NT ...(...) 3♦ = positive, 3361 (D 1-suiter, "low shortage") ...P = weak NT ...(...) My own interest in Swedish Club-like P-1♣ structures is mainly in a context where P(1st/2nd seat): up to 13 if BAL but does not include unBAL "opening hands" (e.g. hands that meet the rule of 19) and some very weak hands therefore need to be opened in 3rd/4th seat just to protect the partscore. One attractive possibility is then to let P-1♣ = "mini-NT" with 8 walrus** - 10 OR "strong club", which also allows P-1♣; 1♦-?: P = the "mini-NT" 1♥+ = the "strong club" (only) . * For example, if T is standard Precision (so that 1♣ is ~ 16+ if unBAL but ~ 17+ if BAL), then we assume there are ways to open all 6+M3-OM and 7+m3-S3-H hands with 8+ hcp. ** Minimum 8+ Milton Work points is required in order for the system to be non-HUM

In an otherwise standard Polish Club system with Multi 2♦ and Muiderberg 2♥/♠ it should be possible to play something like P-1♣; 1♥("7-11, 4+ H")-2♦; ?: 2♥ = 4+ S ...2♠ ......2N = 3-suited .........3♣ ............3♦ = 4-5 D ...............3♥ ..................3♠ = 4441 ..................3N = 4450 ..................4♣ = 4540 ............3♥ = 4414 ............3♠ = 4405 ............3N = 4504 ......3♣ = BAL or 6+H5S .........3♦ ............3♥ = high shortage ............3♠ = 5611 ............3N = 4432 ............4♣ = 5620 ......3♦+ = H+S reverser 2♠ = BAL, not 4 S ...2N ......3♣ = 5 H .........3♦ ............3♥ = 2533 ............3♠ = 3523 ............3N = 3532 ......3♦ = 4 C .........3♥ ............3♠ = 2434 ............3N = 3424 ......3♥ = 3433 ......3♠ = 2443 ......3N = 3442 2N = H+D reverser 3♣ = 3-suited with 4H1-S ...3♦ ......3♥ = 1444 ......3♠ = 0445 ......3N = 0454 3♦ = H+C reverser, high shortage 3♥ = H+C reverser, even shortage ...3♠ ......3N = 2425 ......4♣ = 1417 3♠ = 3415 3N = 2416 4♣ = 3406 4♦ = 2407 P-1♣; 1♠("7-11, 4+ S")-2♦; ?: 2♥ = 4+ H ...2♠ ......2N = 5S5H or 6+S5+H .........3♣ ............3♦ = high shortage ............3♥ = 6511 ............3♠ = 5521 ............3N = 5530 ............4♣ = 6520 ......3♣ = 3-suited .........3♦ ............3♥ = 5404 ............3♠ = 5440 ......3♦+ = H+S anti-reverser 2♠ = BAL, not 4 H ...2N ......3♣ = 5 S .........3♦ ............3♥ = 3233 ............3♠ = 5323 ............3N = 5332 ......3♦ = 4 C .........3♥ ............3♠ = 4234 ............3N = 4324 ......3♥ = 4333 ......3♠ = 4243 ......3N = 4342 2N = S+D reverser 3♣ = 3-suited with 4S1-H ...3♦ ......3♥ = 4244 ......3♠ = 4045 ......3N = 4054 3♦ = S+C reverser, high shortage 3♥ = S+C reverser, even shortage ...3♠ ......3N = 4225 ......4♣ = 4117 3♠ = 4315 3N = 4216 4♣ = 4306 4♦ = 4207 The structure is maybe +2 or so on average, but Responder's range is never wider, and often narrower, than 7-11.

https://www.bridgebase.com/forums/topic/86290-any-suggestions/

So how should the defence go on the layout where South has A8732 T872 96 64?

Sorry, I didn't mean to imply that I do.

In this thread on Bridgewinners, Kit Woolsey claims that 4N in the standard 2/1 sequence 1♠-2♥ 3♦-3♥ 4♦-4N is RKC, not natural. (Thanks for mentioning this, Benoit!) But if not natural (I don't care), then it seems that Norwood could be used to check for key cards and the trump queen also in the case where Responder has a slam going hand with self-sufficient hearts: 4N = even KC ...5♣ = trump Q ask ......5♦ = no trump Q, D is trumps ......5♥ = no trump Q, H is trumps ......5♠+ = trump Q (details?) 5♣ = odd KC, no trump Q ...5♦ = insufficient KC if D is trumps ...5♥ = sufficient KC if D is trumps, insufficient KC if H is trumps ...5♠+ = sufficient KC (details?) 5♦ = odd KC, trump Q, D is trumps 5♥ = odd KC, trump Q, H is trumps A similar Norwood, but this time with three potential trump suits, could be used to solve another problem in my own system: How to check for key cards and the trump queen in any of the potential trumps suits D, H and S after ...4♥ = <3-point range>, 5530 if 4♠ would to play. I.e. something like: 4N = even KC outside C ...5♣ = trump Q ask ......5♦ = no trump Q, D is trumps ......5♥ = no trump Q, H is trumps ......5♠ = no trump Q, S is trumps ......5N+ = trump Q (details?) 5♣ = odd KC outside C, no trump Q ...5♦ = insufficient KC if D is trumps ...5♥ = sufficient KC if D is trumps, insufficient KC if H is trumps ...5♠ = sufficient KC if either D or H is trumps, insufficient KC if S is trumps ...5N+ = sufficient KC (details?) 5♦ = odd KC outside C, trump Q, D is trumps 5♥ = odd KC outside C, trump Q, H is trumps 5♠ = odd KC outside C, trump Q, S is trumps

Partner didn't make a lead-directing overcall, so presumably doesn't have KJTxx or better spades. Zia would probably not bid 2N then 3N over 3♣ without anything resembling a heart stopper, so probably has ♥Jxxx at the very least. His most likely shape appears to be 4432, but it doesn't matter if he's 3442 instead. At first I was considering a shift to a low club, hoping for a layout like [hv=pc=n&s=sk8732ht932d96cq4&w=sajt9hj876dajtc76&n=s54hak54d52ca9832&e=sq6hqdkq8743ckjt5&d=w&v=b&a=1dp2dp2np3cp3nppp&p=hahqh2h6]399|300[/hv] , but that would smell too much of an underlead from the ace for Zia to go wrong. There might be a tiny chance that partner chose to encourage hearts (= discourage spades) on a layout like [hv=pc=n&s=skj732ht932d96c64&w=sakjthj876dajtcq7&n=s54hak54d52ca9832&e=sq6hqdkq8743ckjt5&d=w&v=b&a=1dp2dp2np3cp3nppp&p=hahqh2h6]399|300[/hv] and that I need to switch a spade. But I think the most legitimate chance is that partner has ♥T87x (or better) and an ace, as in [hv=pc=n&s=sa8732ht872d96c64&w=skjt9hj963dajtcq7&n=s54hak54d52ca9832&e=sq6hqdkq8743ckjt5&d=w&v=b&a=1dp2dp2np3cp3nppp&p=hahqh2h3]399|300[/hv] or [hv=pc=n&s=s98732ht872da6c64&w=sakjthj963djt9cq7&n=s54hak54d52ca9832&e=sq6hqdkq8743ckjt5&d=w&v=b&a=1dp2dp2np3cp3nppp&p=hahqh2h3]399|300[/hv] , in which case I should continue with a boring small heart at trick two.

But what if it were clear from their CC that * they lead A from AKx(...) * the low club was attitude * East would have opened with ♠Q+♦AK+♣Q/K ("we open all 11s") ?

Could we have a look at opps' CC?

A related thread, although noone there got as far as suggesting using 3♠ as a puppet to 3N. It's a very interesting idea, but shouldn't 3♠ in general be a marionette (or even relay) rather than a puppet? My favourite song from the album:

The idea that methods can generally be disclosed fully at the table is incredibly naive. For example, how would any of you describe exactly the set of hands on which you would open 1♠ in 1st seat V vs. NV?

If East ruffs with the T or J, South must play the (club or heart) four in these three (surprsingly similar?) cases: 1) [hv=pc=n&s=sha9dc4&w=sq9hdc3&n=s7hd97c&e=shjt5dc]399|300[/hv] 2) [hv=pc=n&s=sha9dc4&w=sq9hdc3&n=s7hd97c&e=shjtdc5]399|300[/hv] 3) [hv=pc=n&s=sha94dc&w=sq9hdc3&n=s7hd97c&e=shjt5dc]399|300[/hv] 1) and 2) both have trump promotion as a theme, obviously.

1. Low from dummy, ace in hand (to preserve the entry in clubs to dummy's spades) 2. ♠Q seems routine. So probably wrong, but I can't think of anything better.

I want to play establish a couple of diamond tricks at some point. But I don't want RHO to win the first diamond trick with the Q from Qx(x(x)) and then shift to a small club from Axx(x(x)). A club shift from LHO is less dangerous. So: 1. J (less revealing to RHO than the K) in dummy, the 2 in hand (consistent with RHO encouraging) if RHO plays the 3 2. small diamond towards the T

Or maybe you could put this hand type in 2N instead and play something like 2♦-2N; ?: 3♣ = 6(+) H, not MAX if 3+ C ...P = the weak hand with long clubs and short hearts ...3♦ = GF relay ...3♥ = INV ...(...) 3♦ = 6(+) S, not MAX if 3+ C [very unlikely hand type opposite the hand with long clubs and short hearts] ...3♥ = GF relay ...3♠ = INV ...(...) 3M = MAX, 6(+)OM3+C, F4♣ [superaccept opposite the weak hand with long clubs and short hearts] ?