Pl has found an interesting position for us, from the class known as prime/prime. These are famous for being difficult to play, both with checkers and cube. I would fully expect a cross section of decent players to offer a range of opinions as White, from not being good enough to double right up to too good. How should you approach this over the table? As ever, Woolsey's rule can be your guide. Are you sure from Red's point of view that this is a correct take? If not, it must be a double. I don't see how Red can be certain that he should take here, so it's good enough to cube. Is it too good? Now you can apply dorbel's rule. If you're sure that it's a double but not certain that it is too good, turn the cube. Sometimes you will lose a bit of equity when they correctly pass but you will put a point on the scoresheet. Occasionally however, they take and then your equity goes through the roof! The main rationale for this plan of action is that doubling gives your opponent the chance to make a mistake, whereas leaving the cube in the middle denies him that opportunity.
This process leads us to conclude that White has a solid double. Should Red take? Personally, I would be glad to give this one up and would pass fairly quickly. Gnu 2-ply thinks that the take is quite easy, but as we have seen so often before, it is wrong. Snowie gets this one right calling it a solid double/pass and rollouts with Gnu and Snowie agree with that. White is on course to win this about 61.5% including about 49.5 gammons and of course a couple of backgammons as the icing on the cake. Even with his 38.5% wins and a few gammons of his own, Red should pass.
Some points to note. Owning the cube is worth a lot to Red here and that is typical of prime/prime positions as a whole. This is because primes are immensely strong but capable of crashing in a single roll. To give a single non-trivial example here, after White double/Red take, if White rolls 6-6, Red can redouble to 4. It's a take for White, actually quite an easy take, but it's not what you want to see! Cube ownership isn't enough to make this a take for Red, but always keep it in mind in these positions.
White also needs to know how to play this with the checkers to get the most out of it. Her first job is to kill sixes in order to keep the board as long as possible and allow time for her straggler to step up an out. Thus if White doubles and Red, a fan of the big turnround takes, a 3-2 for example should be played 8/5, 8/6. Any other play is wrong and anything with 9/7 in it is a humungous blunder. If Red knows enough about White's play to know that she is capable of making a mistake like this, then that might be enough to justify a take! You can also talk yourself into taking if you know that White handles 4 cubes badly, either being prone to weak passes of a recube or alternatively being a rash taker of cubes that should be dropped. Note that at this score you need about 3% more than usual to take a 4 cube, around 25% as an average rather than the more normal 22%. These figures assume no gammons by the way.
So to sum up, as White ship it in and let Red do the worrying. As Red, give it up and move on to game 2.

I thought it was a huge take. Obviously the 1-6 as a unit would be wonderful for White but it's the dream rather than the expectation. The awkward-to-disastrous large doubles have more chance than that nice roll. I don't think that White has an awful lot of timing in which to get a 1 and then a 6 so pretty soon it would be crunch time.

I ummed and aahed between Double/take and No double/take and finally stabbed the No Double, my usual caution gaining the upperhand again.

4-ply cubeless equity  +0.517 (Money:  +0.537)

Cubeful equities:
1. Double, take         +0.752
2. Double, pass         +1.000   (+0.248)
3. No double             +0.546    (-0.206)

Proper cube action: Double, take

Cube analysis, 1296 games

2-ply Rollout cubeless equity  +0.689 (Money:  +0.676)

Cubeful equities:
1. Double, pass         +1.000
2. Double, take         +1.220  ( +0.220)
3. No double            +0.743  ( -0.257)

Proper cube action: Double, pass