nullve

So 12-15 is not a NT opening range.

Are you sure the auction didn't go [hv=pc=n&s=sa63haq4dakj653c4&n=sk854h72dqcakqj52&d=s&v=0&b=11&a=1dp2cp2dp2sp2np3cp3dp3np4np6nppp]266|200[/hv] ?

And then 5 hcp with the same shape: [hv=https://www.bridgebase.com/tools/handviewer.html?lin=st||pn|~~M4589luq,nullve,~~M6365hgk,nullve|md|1S63HAKQT2D53CAJ98,SAJ4H875DKT42CT72,SQT987HJ94DQ98C43,SK52H63DAJ76CKQ65|sv|e|rh||ah|Board%2019|mb|1H|an|Major%20suit%20opening%20--%205+%20!H;%2011-21%20HCP;%2012-22%20total%20points%20|mb|P|mb|1S|an|One%20over%20one%20--%204+%20!S;%206+%20total%20points%20|mb|P|mb|2C|an|Opener%20two%20rebid%20--%204+%20!C;%204-%20!D;%205+%20!H;%203-%20!S;%2011-16%20HCP;%2012-18%20total%20points%20|mb|P|mb|2H|an|2+%20!H;%204+%20!S;%206-9%20total%20points%20|mb|P|mb|P|mb|P|pc|H5|pc|H4|pc|H3|pc|HA|pc|S3|mc|1|]400|300[/hv]

Robots (basic? advanced?) are free today: [hv=https://www.bridgebase.com/tools/handviewer.html?lin=st||pn|~~M4589luq,nullve,~~M6365hgk,nullve|md|1S65HAK752DK4CKJ72,SA43HJ8DJ652CAT65,SQT987HT94DQ98CQ3,SKJ2HQ63DAT73C984|sv|o|rh||ah|Board%2011|mb|1H|an|Major%20suit%20opening%20--%205+%20!H;%2011-21%20HCP;%2012-22%20total%20points%20|mb|P|mb|1S|an|One%20over%20one%20--%204+%20!S;%206+%20total%20points%20|mb|P|mb|2C|an|Opener%20two%20rebid%20--%204+%20!C;%204-%20!D;%205+%20!H;%203-%20!S;%2011-16%20HCP;%2012-18%20total%20points%20|mb|P|mb|2H|an|2+%20!H;%204+%20!S;%206-9%20total%20points%20|mb|P|mb|P|mb|P|pc|D2|pc|DQ|pc|DA|pc|D4|mc|12|]400|300[/hv] Note that 1♥-1♠; 2♣-2♥ = "2+ ♥; 4+ ♠; 6-9 total points" in this robot's system. Giving North a slightly better hand: [hv=https://www.bridgebase.com/tools/handviewer.html?lin=st||pn|~~M4589luq,nullve,~~M6365hgk,nullve|md|1SA3HQ8763DJ6CAK84,SKJ542HAKDAT4CJT2,SQT987HJ94DQ98CQ3,S6HT52DK7532C9765|sv|n|rh||ah|Board%2015|mb|1H|an|Major%20suit%20opening%20--%205+%20!H;%2011-21%20HCP;%2012-22%20total%20points%20|mb|P|mb|2H|an|Simple%20raise%20--%203+%20!H;%207-10%20total%20points%20|mb|P|mb|P|mb|P|pc|HA|pc|H9|pc|H2|pc|H3|mc|12|]400|300[/hv] So 1♥-2♥ = "Simple raise -- 3+ ♥; 7-10 total points".

From the Kokish-Kraft notes: 1♥-1♠ = "4+S, could be extremely light" 1♥-1N = "Semi-forcing, maximum 12 HCP; opener can pass if BAL, with no game in sight (rare)" 1♥-2♥ = "Not a terrible raise" 1♥-1♠; 2m-2♥ = "NF: most often two-card support; if three, then very weak hand"

Not to me, either!

Yes, but total points, not hcp. (Very important!) In standard 2/1, 1M-1N; 2m-2M and 1♠-1N; 2♥-2♠ is either (possibly false) preference with doubleton support (and ~ 5-9 hcp) OR something like 5-7 total points with 3c support. Over this, Opener bids exactly as he would if Responder's rebid had denied 3c support. It's obviously possible to play 1♥-1♠; 2m-2♥ the same way.

[hv=https://www.bridgebase.com/tools/handviewer.html?lin=st||pn|nullve,~Mwest,~Mnorth,~Meast|md|4SAK92HKT6DQ8CAJ73,SQJ8HA7DAJ962CQT4,ST743HQJ8DK75C986,S65H95432DT43CK52|sv|e|rh||ah|Board%206|mb|P|mb|1N|an|notrump%20opener.%20Could%20have%205M.%20--%202-5%20!C;%202-5%20!D;%202-5%20!H;%202-5%20!S;%2015-17%20HCP;%2018-%20total%20points|mb|P|mb|P|mb|P|pc|S8|pc|S3|pc|S6|pc|S9|pc|H6|pc|H7|pc|HJ|pc|H2|pc|C9|pc|C2|pc|C3|pc|CT|pc|CQ|pc|C6|pc|C5|pc|CA|pc|C7|pc|C4|pc|C8|pc|CK|pc|S5|pc|S2|pc|SJ|pc|S4|pc|DA|pc|D5|pc|D3|pc|D8|pc|D2|pc|D7|pc|DT|pc|DQ|pc|HT|pc|HA|pc|H8|pc|H9|pc|SQ|pc|S7|pc|H5|pc|SA|mc|8|]400|300[/hv] I've seen GiB lead small from QJx before, but I forgot.

You could play Mulberry, e.g 4♣ = puppet to 4♦ ...4♦ = forced ......4♥/4♠/4N/5♣ = key card asks in C/D/H/S, resp. 4♦ = stop signal 4M/5m = natural slam tries (NF) 4N = quantitative . Or borrow from Zelandakh (as I do in situations like this) and play 4♣ = puppet to 4♦ ...4♦ = forced ......4♥/4♠/4N = key card asks in D/H/S, resp. 4♦ = key card ask in C 4M/5m = to play 4N = quantitative, since Opener's approximate strength is known, making the natural 4M/5m slam tries practically redundant.

So Multi 2♦ is an exception to being a Brown Sticker. There is no exception for a Multi 2♥ opening (called 'Major Flash' by Chris Ryall) as long as the bid can be made with 9 hcp or less. The policy seems to allow 2♥ as Multi with 10-13 hcp instead of Weak Two strength.

https://www.bridgebase.com/forums/topic/88055-rkcb-cleanup/

I don't know about KK Relay, but here's my auction:

In a 2/1 context, both 'non-forcing' and 'semi-forcing' are used to describe a wide-ranging 1N response to 1M. It's easy to find examples from top level bridge where 'semi-forcing' is used even if 1N doesn't include a 3c limit raise, but I'm not sure I've seen 'non-forcing' being used if it does.

Hehe, thanks. A solution I'm quite happy with is

This is also the case in a typical 2/1 system where 1M-1N is described as 'non-forcing'. At least in Europe.

N: 15 hcp, 4522 S: 7 hcp, 3154 Bidding: 1♥-1N 2♣-P That didn't work! Next time: N: 15 hcp, 4513 S: 7 hcp, 3154 1♥-1N 2♣-2♦!? P That didn't work! Next time: N: 15 hcp, 4513 S: 7 hcp, 3154 1♥-1N 2♣-2♦!? 2♠!?-P That worked! Next time: (...)

Yes, although I believe both pairs, as well as most top Italian pairs, play systems based on Garozzo's 2/1-like Ambra system where 2♣ can alternatively be described as "GF NAT or BAL or FIT", to borrow from P-Z.

Convention cards for the pairs playing 2/1-like systems in the 2022 Bermuda Bowl Final: Brink-Drijver (for Switzerland) Gawrys-Klukowski (for Switzerland) Piedra-Zimmermann (for Switzerland) vandenBos-vanLankveld (for the Netherlands) As you can see * B-D, G-K and vdB-vL played 1M-1N as NF, P-Z as "NAT"; * B-D and vdB-vL played 1M-2♣ as "GF relay", G-K as "F1, semi nat", P-Z as "GF NAT or BAL or FIT"; * B-D and vdB-vL played Gazzilli over 1M-1N.

East didn't overcall and was therefore the opponent most likely to have 3 hearts.

I would be able to reuse my usual relay structures after e.g. 1♣-1♥; 2♦-2♥; 2♠(relay)-?: 2N = BAL, not 3433 3♣ = 5+ C 3♦ = 1444 or 3433 3♥+ = 5+ D . (In more detail: ) Besides, if the a) in is precisely hands that would raise a 1♥ response to 2♥ in Dutch Doubleton, then you could also just turn 1♣-1♥; 2♦-2♥; 2♠+ into a better version of 2♦-2♥; 2♠+ in Benji/SEF. Better, because Responder has already shown ~ 8-11 and either 4H3-S or 5H(332) and 1♣-1♥; 2♦-2♥; 3♥ would not be the problem sequence that 2♦-2♥; 3♥ is in Benji/SEF.

Yes, it's called 'Velociraptor'. In one partnership I played 2♣ = Multi 2♦-like (with 6M3-OM or 5M4+m3-OM) or GF with primary hearts 2♦ = Ekren (with 4+S4+H) or GF with primary spades 2M = Velociraptor (with 4M5+m3-OM) .

Idea: 1♣-1♥; ?: (...) 2♦ = a) H raise b) "22+" 2♥ = c) C+D reverse d) 17-19 BAL (...) 1♣-1♥; 2♦-?: 2♥ = < INV opposite a), either 4 H or 5H(332) [so likely no Law protection at 3♥] ...P = a), no game interest ...2♠ (and/or 2N?) = b), relay ......2N+ = e.g. NAT ...(...) 2♠ = < INV opposite a), 5+ H, not 5H(332) [so likely Law protection at 3♥] ...2N = b), relay ......3♣+ = e.g. NAT ...(...) ...3♥ = a), to play ...(...) 2N+ = at least a game try opposite a), hopefully infrequent opposite b) 1♣-1♥; 2♥-?: 2♠ = relay (GF) ...2N = d) ...3♣+ = c), e.g. NAT (...)

Yes, (2♦)-X-(P)-P (P) and (2♦)-X-(P)-2♠ (P), for example if Overcaller: 14 hcp and 2434 Advancer: 6 hcp and a) 5+ S b) 4324

WBF rules (WBF Systems Policy) Here is a convention card from the 2022 Bermuda Bowl. The NV 2♦ opening is described as "5/6cM, 3-8 hcp" If that's a Brown Sticker convention (say, because the weak option is not hands that would open a tradional Weak 2M), the CC should have a Brown Sticker attached to it. It doesn't, so I conclude again that it's not a Brown Sticker convention. I bet the Garbage Multi I defined above is not significantly different from what they actually play except for the range. Despite some Burn's law violations or worse?

If someone say they play "undisciplined Weak Twos", can they really play something deserving the name 'Weak 2M' if they open 2M only if they have either 6M3-OM, 5M4+m3-OM or 5M(332)? If the answer is Yes, why is the above Garbage Multi a Brown Sticker? Btw, Brown Sticker conventions are not generally allowed in Norway. The above Garbage Multi is, rightly or wrongly.