GrahamJson, on 2018-December-07, 09:21, said:
Whilst I don't dispute that the aces and the diamond queen are great cards don't forget that the 3C bid showed values, although exactly how good these are depends on your agreement. Also, I consider south's hand to be just about as good as it could possibly be on the bidding so far. I wonder, would he bid the same with KJxxxx of hearts, say, or without the diamond king? If so then you certainly don't want to venture beyond the four level.
The crux of the bidding rests on some understanding of how weak a hand the Lebensohl 2 NT sequence shows, how strong a simple suit bid can be, and minimum strength for a
♠ cue in response to the takeout double. Different people will have different views on where these will be. I play with one really fine player who thinks you need 8 or 9 counts to just bid a suit and Lebensohl 2 NT with lesser hands. I also play with other very good players where a decent 6 count is enough to avoid the Lebensohl 2 NT drop dead sequence.
You need understandings not only about advancing the takeout double, but also exactly what's expected when you double and show 2 suits (i.e. the big 2 suiter). IMO, neither of the alternate examples you pose would qualify as a big 2 suiter for me. I'd be overcalling 3
♥ with both and trying to bid
♦ later, if possible.
I'd probably respond 3
♣ to the takeout double, but not without some trepidations. IMO, advancer's hand is close, but not quite enough for a cue. The question is what should advancer do over doubler's 4
♦ call.
♦ Qx has turned to gold giving advancer 3 cover cards for doubler's losers. OTOH, if doubler is simply 5-5 in the red suits, slam isn't necessarily a sure thing. Tough decision, but I'd probably give it one try with a 4
♠ call.