This was the wackiest set of hands I've played in years.
All problems matchpoints. What happened at the table will follow in the Comments.
(A) KJ963 A 9 986432, red vs. white
RHO passes. First of all, what's your action? I decided to open 1C. LHO bid 1D, pard bid 1NT, and RHO tabled 2H. What's your call here?
(B) AQ74 none KQT753 Q42 white vs. red
You open 1D in first chair. Lefty passes, partner bids 1S, and RHO butts in with 2H. You're up.
(C) 43 J72 AT43 T865, all red
LHO opens 1C. Pard doubles, and RHO bids 1H. I know I won't get a lot of support here, but let's say you bid 2D. (For those of you who disagree with 2D, would you bid if you could show the suit at the one level?) LHO now bids 3C, partner bids 3H, and righty passes. Your call.
(D) KQ9 A96 AJ754 K7, red vs. white
You open 1D (1N would have been 14-16). LHO overcalls 2C, which is raised to 3C on your right. What's your bid?
(E1) A9 T65 KJ8765 T4, white vs. red
Partner, in first seat, opens a 14-16 NT. Your choices are 2N (natural), 3N, or 2S (clubs or invite in diamonds). What's your guess?
(E2) Say you go the third route, and start with 2S. Pard bids 3C (does not accept an invitation in clubs), and you bid 3D, revealing your hand. Partner continues with 3H. You're up.
(F) 62 AJT8753 72 KJ, all white
Pard opens 1D in first chair. RHO bounces to 3C, and it's your call.
(G) AK6 J85 93 AKQ63, red vs. white
In second chair, pard opens a weak 2D. RHO comes in with 2S, and you bid 3N. This is passed around to righty, who viciously doubles. You can make a "content" pass, a "doubt" redouble, or a "pansy" pull.
(H) 8763 none A732 J6542, white vs. red
Pard opens 2S in first chair. Righty doubles. You can bid some number of spades, or stick in a lead director at the three level (by bidding one under the suit). You're up.