Posted 2018-September-05, 12:41
Personally, I would bid 5C after 4C. But I think 4D Last Train and key-card are also very reasonable. A 4H call is a little conservative, but not totally unreasonable. What I absolutely don't think North should do is to bid 4D as a diamond cue-bid.
First, let's think about what 3H means. The auction 1H-(2S) creates some difficulties. If you raise to 3H with any standard 6-9 raise, then how do you handle a limit raise? You have no bid. So the typical answer with heart support is to have four ranges, roughly as follows:
1. Less than 7 with four-card support or a really great 7 with 3-card support: Pass and bid 3H if partner reopens with a X, as he will often do
2. A really good 7 (can be a bad 7 with four card supp) to 10 or so: 3H
3. 11-14 or so: 4H
4. Good 14+: 3S
North has exactly what I would expect for a 3H bid -- right in the middle. On the plus side, there is four-card support, a good source of tricks with the clubs, and a stiff diamond. On the minus side, there is no trump honor, no first-round control, the J of spades is pure waste, and it would be better if the stiff diamond were a small one, not the J (more potential points for partner).
Now let's think about what kind of hand South has. After (3S) and 4C, South almost certainly has a stiff spade (for their bidding, West should have six and East three), the Ace of clubs, and good hearts. If South has the Ad and the AKQh (possible), then slam ought to be a great bet. If South is missing any of these cards, we probably don't want to be in slam (though if South has 6 hearts, we don't need the Qh).
Is 5H going to be safe? Not necessarily. What if South has
x AKJxx KQxx Axx
Now you will be stuck trying to guess the heart position to avoid off one. So there is certainly some merit in settling for a 4H bid.
Nevertheless, that's about the worst hand I can posit to justify South's bidding, and even there 5H will make more often than not (cash-cater a heart honor and finesse East for the Qh on the second round, and you'll be right well over 60% of the time). So I think 5H will make the overwhelming majority of the time, and some move toward slam is thus safe and warranted.
I see three possibilities: 4D, key-card, and 5C. Let's take them each in turn:
4D: This is fine if it's Last Train. Basically, that would mean you're telling South that you're good enough to be interested in slam, but aren't good enough to be able to bid key-card all on your own and don't have any particular feature you want to emphasize. That's arguably your hand. With first-round control of three suits, a really good six-bagger in hearts, and a stiff spade, South can now trot out key-card. You'll end up in 5H or 6H, depending on whether South wants to gamble a bit with the trump suit.
But if 4D is a cue-bid in diamonds, I don't like it. South is going to get really excited with something like:
void AKxxx KQxx Axxx
I don't think you want to be in 6H here, but if you bid 4D, that's exactly where you're going to wind up.
Key-card (whether 4S or 4NT): This actually has a lot of merit. If South has AKQh and Ad, you belong in 6. Otherwise, you probably want to stop in 5H and should be relatively safe there. When South shows 3, you can ask for the Q, and now South has to judge whether six and the AKJ are as good as the Queen. Tough. You probably end up in 5.
5C: Since you rate to be safe in 5H, I like this call a lot. You show a good source of tricks in clubs, but warn partner that you probably don't have control of diamonds or spades. Aha! That's your hand! Partner has an easy jump to 6H over this bid.
Cheers,
Mike