[chasetb]

Entering on my phone, will edit tonight to make it easier to read.
You hold: S Qxxx H Qxxxxx D x C xx .

LHO is dealer, all Vul, auction goes:
(1D) - 1S - (1NT) - 2S
(2NT) - P - (3NT) - P
(P) - X - A.P.

1.) What do you lead?
2.) If you hadn't supported partner and (s)he still doubles, do you make a different lead

[rmnka447]

If you are playing "standard" agreements, then lead your ♦. A double of 3 NT by partner of the opening leader normally asks for a lead of dummy's first bid suit.

If partner wanted a ♠ lead, it would be right to pass instead of double.

[SteveMoe]

Lead a ♠. Partner's double simply says that s/he expects to beat this contract given their hand and our bidding. Do we really think they can make 9 tricks without touching ♦ on this bidding?

[silvr bull]

My understanding of the standard agreement after a double of 3NT is:

a) If either defender has bid a suit, lead it;
An example might be 1D (1S) 1NT (P), 3NT (X). If the doubler has KQJTxx xxx Ax xx. Then an immediate S lead is essential before the D stop is knocked out. Without the double, opening leader might try a C from CKQT9x and no side entries.

b) If the defenders bid two suits, lead one of them and hope to guess the right one;

c) If the defenders have not bid any suits, then lead the first suit bid by dummy.

With those guidelines, my answer to both of the OP questions is lead a S.

[alok c]

What is 1♠, 4c or 5c?If RHO is not a complete lunatic, I would expect him to hold ♠AJ10 as opponents opened & raised ♠s,moreover it is apparently only sure entry in my hand. For ♦s, declarer will play it.IMO choice is between ♥ & ♣, I would lead a ♣.

[JLilly]

nm