My initial thoughts:
Problem A 3
I have a huge fit, first or second round controls of the side suits, so I will splinter since I am assured that partner will take it as such. Anything in the black suits from partner is gold, so partner should be in a position to evaluate that and decide whether to take a move toward slam.
Problem B Pass Do I want to double with my only quick tricks in spades and partner may pass with a four or five card stack? Do I want to rebid my spades with only five, albeit great, spades? Do I want to try NT with a void in partner's probable longest suit? Or do I want to introduce a jack-high suit at the four level? Sometimes the better part of valor is to know when to back away.
Problem C 2
I am probably going to switch to 2
, but right now, I want to try the hearts on. The advantage I see to bidding the hearts is that in addition to finding partner with four as well, you may get a preference to spades with two or three trump, and could make a game try.
Problem D 4
Reverse the vulnerability, and Pass is my choice. At unfavorable vul, I'm a bidder and hope for a safe landing.
Problem E 3
Without length in the spade suit, and length in the diamonds, double is clearly wrong. Qxx is a shaky stop at best, so I am not inclined to bid NT unilaterally. That leaves cue-bid looking for help and 3
. I prefer to bid where I live; partner still has room to cue-bid and ask if NT is right.
Problem F Dbl Partner has 5 to 9 HCPs and probably shortness in clubs. I hate doubling without hearts, but at least I can takeout partner's hearts with spades and suggest both pointed suits.
Problem G 3 NT I really hate this set. 23 HCPs, a probable double stop in the opponents suit, first round control in all suits, and nine almost certain tricks. There may be a slam in these cards, but I will settle for the almost certain game.
Problem H
9 Once I decided to go with a spade, I checked out which spot was called for. BWS says "(ii) Spot-card leads: fourth-highest; second-highest (but highest of equals) from a weak suit" My initial plan of leading the 8, was fine for "second-highest," but not good enough with "highest of equals."