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With that hand from partner, LHO will have something like KQxxx KQ Qx KJxx Neither of them are going to pass. An immediate 4♥ is too risky - partner is likely to take you to slam or double an making contract. I'd pass first, then bid 4 or 5♥s

I thought about it further and I think it may be possible to incorporate relays with the low-stop invitations and allowing opener to show unbalanced hands using transfer. The key here is to move the relay start bid to 2♠. With my stringent 1NT opening (no 4-4 majors, no 5 card majors), there are a total of 20 hands (10x 4432, 4x 4333, 6x 5332), which can be relayed up to the 4♣ level, allowing the use of 4♦ terminator. Single suited hands strong GF hands are now bid through Walsh relay (not available under Keri because the sequence shows invitation with both majors). So 1NT - 2♦ - 2♥ - 2♠ - 2NT - 3x = Single suited strong hand As in Keri, 5M-5m hands are shown using transfer followed by 3m, and 5M-4m hands are shown using transfer followed by 2NT. I need to think about how to show 4M-5m and 2 suited minor hands though. There may be enough space if I use 2♠ response to 2♣ to show all maximum openings. The previous meaning of 2♠ can be rolled into 2♦ without problems. Showing a 2 suited hand 5-4 hand should imply 5431. 5422 hands should probably ask opener to relay out the hand.

It's possible, if you can accept playing the occasional 4-3 fit. This is the basis of the Keri over 1NT structure. Keri, however had problems when responder has 4-4 or 5-4 majors, a problem which the simple structure solves: 1NT - 2♣ 2♦ = min, denies 4 card ♥s 2♥ = min, 4 card ♥s -> 2♠ = invite with 4-5 ♠s 1NT - 2♣ - 2♦ 2♥ = 5 card ♥s 2♠ = 4-5 card ♠s This solves all the problems with responder having 4-4 or 5-4 in majors In the case of 4=4 or 5=4, responder passes a 2♥ response and bid 2♠ over a 2♦ response In the case of 4=5, responder passes a 2♥ response or bids 2♥ over 2♦ and opener corrects to 2♠ or 2NT with doubleton ♥s

Of course, I played this structure in the context of a moscito (2001) system which opened 11(+) - 14 1NT. It would definitely be nice for responder to relay out distributional hands, but the cheapest way to do that would be: 1NT - 2♣ = Good game force, please bid 2♦ so that I can begin relays 2♦ - 2♥+ = Symmetric relays on a +5 track Which is way too high to begin symmetric relay. We were considering using Keri, which allows stopping in 2 of a major in many cases (but had problems stopping at 2 level with 4-4 or 5-4 in the majors, unlike my structure), and handled the distributional hands pretty well, but not balanced slam tries when the fit is in the minor (which is easily handled using relays). I suppose there are always going to be tradeoffs here and there. Let's see if anyone can come out with a structure that allows minimum opener to stop at 2 opposite an invitation, responder to show unbalanced with slam interest, and balanced responders to ask opener about exact shape and strength

I like playing the first version of the Kaplan Inversion with a weak NT opening that can have a 5 card major. This way 1♥ - 1♠ - 2m and 1♠ - 1NT - 2m is always 4+ cards

This was a system I played. It is pretty accurate and we will always stop at the 2nd level with the correct major fit (which may be 4-3 in one case) when opener is minimum and responder is inviting with a 4 or 5 card major. 6 card majors and 5-5 major invites will be resolved at the 3rd level. Note that this system was designed to be used with a system that NEVER opens 1NT with 4-4 in majors. If you do use this with a 4-4 major 1NT opening, you will likely end up playing a 4-4 ♥ when a 5-4 ♠ is available. After 1NT - 2♣ - Game Invite, or minimum GF hand that doesn't wish to use relays 2♦ - Non-minimal Game Force - Begins Relay 2♥/2♠ - To play 2NT - Transfer to 3♣, Pass or Correct to 3♦ 3♣/3♦ - Invitation 6 cards 3♥/3♠ - 5-5 majors GI/GF After 1NT - 2♣ 2♦ - Min, denies 4 ♥s, possible 4 ♠s + 3 ♥s 2♥ - Min, 4 ♥s 2♠ - Min, 4 ♠s + 2 ♥s 2NT - Max and not 4333 - 3♣ is stayman 3♣ - Max and 4333 - 3♦ is stayman After 1NT - 2♣ - 2♦/♥/♠ 2♥ - 5 ♥s, to play 2♠ - 4-5 ♠, correct to 2NT with doubleton 2NT - to play 3♣ - 5 ♥s GF (and possibly 4♠s) 3♦ - 4 ♠s GF 3♥ - 6 cards invitation (or 5 if raising 2♥) 3♠ - 6 cards invitation (or 5 if raising 2♠) The key is in the 2♠ response to 2♣ denying 3 ♥s which ensures that responder inviting with 5 card ♥s can still stop at 2♥s with a 5-3 fit