I played from the position of problem 85 a bunch of times trying to improve my prime vs prime and containment game understanding. Many curious and tough positions appeared.
Here are some positions to test our wits:

Position A
black on roll. Cube decision?


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Position B
such plays can sometimes be crucial


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Position C
black on roll. Cube decision?


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Position D
what to do? what to do?


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Position E
two possible plays. Which one is better?


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Position F
black on roll. What do you think about this? Cube decision?


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Position G
black on roll. Cube decision?


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Position H
some freak rolling brought black and white to stare at each other's noses on the 14th and 13th points. Now, what to do with this 33?


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Position I
black on roll. Cube decision?


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What's your play for A, B, C, D, E, F,G, H, I and why?

A) ND/take. He's probably going to crunch, but I don't want to be playing for 8 (or getting gammoned) when he does something good.

B) Bleh.. coming off the 24 activates a lot of little numbers for him and asks to get gammoned a lot more. When it all goes to ****, I at least want the equity from playing out my 1-point game at the end which I don't have if I leave now. Two guys spying his checkers seems optimal. I guess you have to kill a checker with 7/1 and play 20/19. Hope he rolls non-doubles low (42-) or high (54+).

C) Guess you played 24/18 7/6 and he rolled badly. At the simplest approximation, you hit 2/3 of the time with a big edge and whiff 1/3 of the time with a big disadvantage (and get recubed a lot). So you're basically paying double for your losses, so bleh. If it's a double, it has to be pretty marginal, so I just keep the cube. ND/take.

D) Cry? Guess you have to just hit and hope he can't roll his guys in.. and that you can roll yours out. Only one move leaves only one entering number, so 5/1 4/1 it is.

E) This is like the same logic with colors reversed. You need to get the **** off the 24 and start getting around the board before his last checker gets free. 7/3* (2) leaves one entering number, hitting loose leaves 2, so the former is better.

F) This is the first time in my life I've worried about a position being too good with 4 men in the air. Obviously you have great outfield coverage when you come in. But there's enough game and enough turns for superb luckboxing that I doubt it's actually too good. Double/take.

G) If I can count, you hit with 29 numbers this time (with a huge edge if you do). 4:1 ratio makes me say ND/drop.

H) White isn't touching your prime yet, so no pressing need to boot him. 14/11 14/5 adds a second direct number to boot him if he rolls a 1 and covers the blot if he does roll 61. And you should get some indirects in the outfield. If you break your 5-prime and he rolls to the outfield, barf.

I) Double/drop. He crunches first way too often with 2 checkers not ready to escape and that's just brutal.