Answers: (More advanced material is in blue; this particular thread is going to get very deep for novices.)
1.
(a) Do you agree with the bidding so far?
(b) What should you bid now?
Hint: What is your partner's likely distribution? Can you take nine tricks off the top? If not, what will the opponents do upon regaining the lead?
Answer:
(a) No. 2H is a reasonable matchpoint bid hoping for a 6-2 fit that will give +110 instead of +90 or +140 instead of +110 or +130. However, this is IMPs and you will usually have four trump losers on a 6-1 fit and may not make 2H, where 2D looks pretty safe with a likely 5-3 fit, club ruffs, and the S-AK. Risking going down is a high price to pay for trying for a few extra points which may be worth 1 IMP.
You might think that you want to bid 2H in case partner has the magic 1-3-5-4 minimum that won't make another call if you rebid 2D instead. However, if partner has that 1-3-5-4 minimum, that means the opponents have about 20 points, nine spades, and only four hearts between them and neither of them could overcall spades or make a takeout double. That hand is very unlikely.
(b) First, what is partner's likely shape? Partner has a spade stopper to bid 2NT yet I have
♠AKx. Partner must have
♠Qxx (not four as partner didn't rebid 1S.) Partner has three spades and at least four of each minor. If partner had 3-2-4-4, partner would have an easy 1NT rebid, so partner has at least nine cards in the minors and at most one heart. Given that partner has at most three points in spades and likely none in hearts, and invited game after your minimum response, partner has substantial strength in the minors.
If partner had 4 diamonds and 5 clubs, partner would have enough to reverse, so partner should have 3 spades, 1 heart, 5 diamonds, and 4 clubs.
Now, what will happen in notrump? Despite partner's strength in the minors, partner is unlikely to have nine running tricks - solid minors would give him a jump shift. (Partner could have S-QJx, H-x D-AKQJx, C-Axxx to have nine running tricks, but that hand plays pretty well with diamonds as trump also.) You'll have to give up a trick and the weak hearts will be visible in dummy, and the opponents will have the same inference about partner's distribution that you do, so a heart shift will net the opponents four heart tricks unless they are 3-3.
While 3NT is likely to need a 3-3 heart split to make, your partner's hand with much strength in the minors is likely to play quite well in 5D. Partner should have no spade losers, one heart loser, and should be able to handle the minors for one loser. I recommend that you bid 5D.
By the way, I think 3D would be non-forcing - a suggestion that 3D will play better than 2NT when declining the invitation.
2.
(a) Do you agree with the bidding so far?
(b) What should you bid now?
Hint: Again, what will the opponents do upon regaining the lead?
Answer:
(a) Yes. The 1S response is pretty clear. On your second bid, you want to keep the bidding below 2NT when you're minimum and partner could be minimum. You can pass (2D isn't forcing) or bid 2H or 2S. Whichever one of those you choose, partner will very likely pass with a minimum. If you bid 2S, you could play there with five trump to the eight opposite a singleton. Passing 2D guarantees at least a six-card fit; bidding 2H guarantees at least a seven-card fit.
(b) Like in problem 1, your partner has shown a club stopper and it is very likely to be
♣Qxx. Partner has shown five hearts and four diamonds, so partner has at most one spade. Unless you have nine running tricks, partner is going to have to lose the lead, and the opponents who have seven spades will take four spade tricks.
However, the singleton spade that is a liability in a notrump contract is very good in a suit contract; you have no wasted high cards in spades so all your high cards will be working.
Partner has at most three points in clubs and probably nothing in spades so partner's red suits are quite good to invite game. You have one loser in the black suits, and if partner's good red suits can be held to two losers, then you can make 4H on the 5-2 fit and I suggest you bid 4H.
You may fear the opponents leading a spade and making you run out of trump. While it's possible, your spade bid may instill a fear in opening leader's hand that a spade lead will help you develop spade tricks. Also, if the opening leader has decent diamond intermediates, he may try to protect his diamond tricks by leading a trump. This will avoid being forced to trump spades and help you avoid trump losers, and one of the diamond losers may go on your fourth club if your partner has
♣QJx or if they are 3-3. Your
♦J may help in promoting diamonds.
If you're thinking about bidding 3C to cater to partner being 0=5=4=4, partner may think you are 4=2=2=5 or 4=2=1=6 and insist on clubs without a fourth club, leaving you to play a seven-card trump fit.
3.
(a) Do you agree with the bidding so far?
(b) What should you bid now?
Hint: Do you think you can take nine tricks off the top? How good is this hand opposite partner's likely distribution?
(a) Yes. (If 3D shows this hand for you, then 3D is fine. Some people play 3D as a limit raise; some play it weaker. In my regular partnership, this hand is too good for 3D which shows not enough to bid 2D.)
When I asked if the bidding was okay, I was assuming the other choice was 1NT. I think 2D is superior because at the time you bid it, the spades are still unbid but West might bid them over either 1NT or 2D. If that happens, 2D lets my partner compete in diamonds where 1NT leaves him in the dark about the diamond fit and may force me to make a guess whether to compete in diamonds at an uncomfortable level.
(b) Caitlynne's analysis is quite good.
You probably do not have nine running tricks and your partner has a singleton heart, so the opponents will take four hearts when they get in with something else if you play notrump. Your hand is excellent for diamond play. You have no heart losers. You have a fifth diamond - you only needed four to raise to 2D in competition (even though some play that the initial raise shows five - for those pairs playing it as a weak raise.) You have the doubleton king in clubs which means no club losers if partner has the ace, or one club loser if partner has the queen or if the 1H bidder has the ace. Your doubleton spade covers spade losers. I like 5D. However, I think this is a fantastic hand for this bidding, so fantastic that I think it's okay to cuebid 3H and then 5D suggesting that your side might have a slam despite your lowly single raise. (AKxx, x, AKxxx, Axx makes 7D a good bet - partner probably isn't quite that good but many hands offer good play for 6D and partner should know if he has one of them if you bid 3H although admittedly he might not work it out if his only loser is a club with his holding
♣Qxx.)
4.
(a) Do you agree with the bidding so far?
(b) What should you bid now?
Hint: How good is this hand opposite partner's likely distribution?
(a) Yes. If partner had made a different game try, we would want to accept and bidding 2H gives him the opportunity to do so, as well as play in the 5-2 fit when partner is minimum.
(b) Miamijd echoed my thoughts well. Partner's 2S bid was the last thing you wanted to hear; as partner has at most one diamond and your D-KQ are wasted. Certainly your cards are poor for a suit contract, but they aren't that good in notrump either. Even though you may have two diamond stoppers (if the
♦A is on your right), you have told the opponents what to lead and they are likely to get off to the best lead. None of your three seven-card fits look like a source of tricks, and entries to your hand to lead hearts or clubs the correct way just aren't there. In spades you might make an extra trick by ruffing a diamond in dummy, so I would just pass 2S and hope to make it. If the opponents lead trump, it might be like playing in notrump but with the opponents leading a suit that is good for you.