[Stephen Tu]

So with a weakish 4-1-2-6 over 1H, it's commonly recommended to suppress the spades and reply 1nt so you can bid the clubs over a 2D rebid. This of course risks missing a 4-4 spade fit when partner is not strong enough to reverse. But makes it a lot easier to get to a reasonable club partial which will be often with a club suit with good internal solidity.

But what if you are 5-0-2-6?? What are you supposed to do then? 1S leaves you considerably stuck over a red rebid. But concealing the spades could leave you missing a NINE card spade fit. And partner might be planning to show extra values in a 3541 hand or similar and not raise spades immediately, playing std methods.
What to do in a standard framework without flannery/KI?

(Unless you've gone through the rearranging of system to enable a GF 2S rebid thus a NF 3c rebid, I guess).

[mw64ahw]

Kaplan Inversion solves this issue for me with 1♥-1NT showing 5+♠ not GI.
Over 1♥-1♠ opener's 2♦ rebid shows 4♠ with a 1NT rebid showing balanced or ♦. If there is no ♠ fit then there is a 3♣ bid for responder or Pass
With a ♥ rebid to show 6+♥ either Pass or 3♣ depending on strength

[Cyberyeti]

Play Bourke style relays.

We home hash a version of this, our version:

1♦-1♠-2♦

2♥=GI+ relay

Other bids are weaker so 3♣ is NF

Sorry misread the OP as over 1♦

Over 1♥-1♠ once partner shows 6 with 2♥ we don't fight it, over 2♦ we're stuffed and have to bid 2♥, we would never suppress 4 spades unless they were very small.

[DavidKok]

I was not at all aware that people commonly suppress the spades. Perhaps this is more of a matchpoint strategy?

If partner has two suits and you have the other two there is little you can do. The best strategy is typically to try to get to a non-terrible contract as soon as possible, then pass. I think deciding that this must be 3♣ as early as seeing the opening bid is not a good idea.
On a more general note, catering your bidding system to misfitting two-suited minima is a waste of space. Just accept that you will have an accident if this situation occurs, and try to minimise the fallout. Here are some related thoughts:

• If you bid spades and partner chooses 1NT you can use checkback/NMF/XYZ (in particular, bypassing the strong bid to show a weak hand) to get back to clubs, and all should be well (even on the 4=1=2=6 hand).
  
• With 5 spades you can bid spades and rebid them over 2♦, hoping partner doesn't take you back to diamonds.
  
• If your clubs are solid and the spades are awkward you could consider a direct 3♣ over 1♥, if that is exactly invitational NF.
  
• If you play Gazzilli you are somewhat protected with the 5=0=2=6 hand. If your hand is really weak either partner will likely bid 2♣ instead of 2♦, or the opponents might interfere.
  
• If your hand is not an absolute minimum you can try 1♥-1♠; 2♦-2NT.

But mostly, any approach designed to solve your problem is going to lose more often than it wins. Just accept that this board won't go well - the rest of the field is having the same issue.

[LBengtsson]

Misfits and 2/1 do not fit well especially with semi-forcing/forcing 1NT approach. Bidding like Canape and supressing suit length lead to 'upside down' auctions like this. I would suppress a 4♠ suit dependant on quality, but never a 5 card one, irrespective of quality.

If the hand is a misfit, the quickest way to get a plus score is not to overstate your hand and be prepared to duck out the auction at a low level. If the other players on the opps team, or other players who are playing MP are playing the same hands, they will have similar decisions to make. No bidding system is perfect, but using your judgement when to bail out is.

Hands less than 24 combined in a misfit are unlikely to have any play for game, and those in a misfit of 25-27 are likely to find game difficult. So I would accept the occasional bad part score where other pairs have found a better place to settle due to our limitation of bidding methods.

[Cyberyeti]

LBengtsson, on 2022-March-20, 03:24, said:

Hands less than 24 combined in a misfit are unlikely to have any play for game, and those in a misfit of 25-27 are likely to find game difficult. So I would accept the occasional bad part score where other pairs have found a better place to settle due to our limitation of bidding methods.

This is a fair comment UNLESS you have a 6 card suit that runs where game becomes more likely