Here is your hand:
♠J3
♥T52
♦KT943
♣Q62
Your LHO (Left Hand Opponent) opens the bidding 1
♥.  Partner bids 1♠.  Your RHO (Right Hand Opponent) says "Pass".  What is your call?
If it makes a difference, you and Partner are vulnerable and the opponents are not vulnerable.
What is your call?
Show Answer
Answer:
I hope everyone PASSED!
You do have 6 HCP.  If Partner had OPENED the bidding 1♠ you would be required to respond 1NT.
But Partner did NOT open the bidding.  Partner made an OVERCALL.  Partner is showing a good five card suit but does NOT necessarily have an opening hand.  They are only making a 1 level overcall.  You do not need an opening hand for that.
In order for you (as ADVANCER rather than RESPONDER) to bid 1NT now you NEED a stopper in the suit the opponents opened.  Since the opponents opened 1♥ you guarantee a trick in the ♥ suit when you bid 1NT.
Plus I would also recommend 8-11 HCP also to make this bid.  Partner might make this bid with only 7 or 8 points.