[gnasher]

1♣   pass 1♠ pass
1NT pass 2♣ pass
2♦   dbl

2♣ forces 2♦, and is either a signoff in diamonds or an invitational hand with 5+ spades.

What should double mean?

[whereagles]

Given we had two chances to bid but didn't I'd say this is some sort of lead director with diamonds.

[wank]

i'll go for take-out of diamonds - something like a 3415 14 count.

[OleBerg]

Take-out would be default in my system, as we double a denomination they might want to play in.

Playing it two-way sounds reasonable. A little risky though, to try without prior discussion, I'd think.

[han]

I think it should be takeout, but I think I would avoid making this double with my partner.

I cannot imagine making a lead directing double here. I can't have a good enough 5-card suit because I would overcall. Doubling on a good 4-card suit is quite risky because the opponents might well be planning to play 2D.

[MrAce]

I dunno the vulnerability but without agreement i would definetely take it as lead directing. A hand like x xx KJTxx xxxxx for example which i would not consider overcalling at any vulnerability. I am scared that in ♠ contract our ♦ can go bye bye on ♣ if pd doesn't start with his unprotected ♦ A especially when 2♦ goes silent in front of us...and some more reasons...

Anyway, what does playing this as take out for ♦ serve for ?? Seriously..
Responder bid 2♣ forcing a 2♦ and will tell his intention...He has a hand he wants to sign off in 2♦ which makes a take out double for ♦ reasonable, however for the rest you are sticking your finger into 220 V socket, with one of your suits opened by RHO , other suit is bid by LHO and they have at least 23-24 hcp if not more and you are not even sure if they have a fit yet ! At the top of the fact that you did not even discuss this with pd.

[FrancesHinden]

This is probably related to an auction in a match earlier this week where gnasher was at the other table. The auction at our table was not exactly as he has put it, which is slightly relevant. The idea that double is a lead director against 3NT is odd, because you are on lead against 3NT. The actual auction was this:

1C - 1H
1S - 2C
2D - ?

1C = may be a doubleton
1H = 4+ spades
1S = either any weak NT without 4 spades, or an unbalanced hand with 3 spades
2C = either a sign-off in diamonds, or invitational with exactly 5 spades, or some game forces with 5 spades
2D = any weak NT

Now partner is likely to be on lead against 3NT. Is it still take-out of diamonds?

[han]

I think it should still be takeout.

[MrAce]

 FrancesHinden, on 2011-April-14, 02:09, said:

The idea that double is a lead director against 3NT is odd, because you are on lead against 3NT.

It is odd that u say this, because;

-Nobody said it was a lead director dbl against 3 NT.

-If thats not what u meant, lead directing doubles are not restricted to NT contracts.

-If thats not what u meant either, this auction does not always end up in 3 NT.

[gordontd]

 gnasher, on 2011-April-13, 05:58, said:

1♣   pass 1♠ pass
1NT pass 2♣ pass
2♦   dbl

2♣ forces 2♦, and is either a signoff in diamonds or an invitational hand with 5+ spades.

What should double mean?

You've had a couple of opportunities to show diamonds, but this is your first chance to show a takeout of diamonds.

[gnasher]

For ease of memory, I'd want double to have the same meaning in both auctions.

[dake50]

Opponents are not finding their S:3-4 fast enough. Here, have a shot at me.

[menggq]

1♣ pass 1♠ pass
1NT pass 2♣ pass
2♦ dbl

2♣ forces 2♦, and is either a signoff in diamonds or an invitational hand with 5+ spades.

What should double mean?

but also ♠4+ balance inv hand etc...

here 2♦ DBL=good♦ but i wonder if hv good ♦ why not bid 1♦ or 2♦weak jump after 1♣? so it might mean others:T/O for ♠?show ♥/♦?if 2♦will be sigh off DBL=T/O for ♦?
anyway this is a good question that's not easy to answer and need pd discuss deeply.