NicebutDim

We were playing a multi 2♦, hence a 2♣ opening is reserved for very strong hands. We had no conventional agreements for responder to show a very weak hand. I agree that 4♥ was not a great bid by me, but didn't know how to continue. Can I bid 2N on a 0 count? Can I bid 2♠ with 10xxx, or does this promise a longer / stronger suit?

At the table, the auction started 2c, 2d, 2h At this point opener has promised 10 playing tricks in hearts. Staring at my 0 count with doubleton Heart, I jump to 4H. This goes down (as does 3NT) but 4S makes on a 4-4 fit. Discussions then followed on why we weren't in this making contract.

Suppose partner gives the weakest possible response in your system. Does this affect how you bid the hand?

I meant a fairly standard 5-card major system, without too many gadgets. If opener bids 2H over 2C, would partner expect a 6-card suit? If so, would a 2nt rebid be better?

You pick up this hand: ♠ A K Q J ♥ A K Q 8 4 ♦ K 8 ♣ Q 4 Playing a natural bidding system, how do you plan to bid it?