I actually don't quite like the 2
♦ negative here. So you haven't got an A and K as your 7 points to make a positive call, but using Kokish I think responder needs to pre-plan ahead. If 2
♣ is unconditionally forcing to game, then with the bidding sequence given 3
♥ would show more than 4
♥ - I agree with Tramticket.
However, the problem is that responder doesn't know opener has a Kokish style hand when he bids 2
♦
As my last post on this forum demonstrated, it is very important having a comprehensive set of responses to a 2
♣ opener. (And my own responses proved that I still have a lot to learn here.) And it's also important to cover responses if the opponents interfere.
The opener has chosen to bid 3
♦ here clarifying his/her hand, but what would XX mean here - to play, tolerance or shortness in the suit; or alternatively, pass which would be forcing, showing what sort of hand? (And after a forcing pass by opener, what would XX, or any other bid mean by responder, too?)
If East has enough to double 2
♠ (blindly) without fear of opener redoubling and ending up with 10 or 11 tricks, then all opener's points are going to be in the other three suits surely. Slam is not going to be far off. But better to proceed slowly. So it's 3
♥ from me. Opener can make encouraging noises after that.
Cyberyeti writes 'I'm going to force you to play our system here, which is 2♣ with a 2♦ negative and Kokish. There was a difference of opinion here as to whether 3♥ was better than 4 or what you do with a 5233/4234 bad hand that wants to hear more before deciding where to play. What do you think should be bid over 3♦ ? and what do you think 3♥ should mean ?
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IMO -- 3♥ = G/F Natural and descriptive.
Partner seems to have little wasted in ♠s, so worth later slam-tries.
You would also have to bid 3♥ with some bad hands
A jump raise to 4♥ would show ♥ support but deny an ace/king/singleton/void.