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Yes, though one need not choose R in order to free up U (in case that was your implication); no assumption or deduction is involved. It just works out (conveniently) that the two families describe different plays:
An R (Run) play is confined to the far side and at least one portion is played to the area between the 17pt and the 13pt. 24/21 24/15* is the only play in the R family.
The destination/s of a U play are confined to the area between the 24pt and 18pt. 24/18(2) is the only play in the U family. Another way to describe this play is @ (anchor).
There may be other choices worth comment. So, I'll include my whole nacbrac.
63S-33 s[E b6.5 U20 D27 B30 R57 S62] "<31*20 10*5
Almost perfect. The only error is that the second play should be italic B (third member). Hitting outranks an extra point (or any number of extra points) unless its in the inner board. The B family is
- B = 13/7* 24/21(2)
b = 13/7* 24/18
B = 13/10(2) 24/21(2)
b = 13/10(2) 24/18
To me, using "b" is a non-critical and understandable error (indeed, I made it myself in the early going, so if you got it from me it's my fault!). It is hard to imagine anyone playing 24/18 13/7*, so your interpreter will almost certainly realize that you mean 13/10(2) 24/21(2). Still, I know that you like to nactate optimally, so I'm mentioning it.
I see you have applied a "within 10" convention (we've discussed) that only plays within 10 (i.e, .010) are to an extra decimal place. That is, B is -.0065, whereas U is .0198 but has been rounded to -.0200, etc. Without the convention, the nacbrac would be one of the following:
- 63S-33 s[E B6 U20 D27 B30 R57 S62] "<31*20 10*5
63S-33 s[E B6.5 U19.8 D26.8 B30.2 R57.4 S62] "<31*20 10*5
In the extra-decimal representation (second row), note that S, which is -.0620, does not need the point-zero after the 62.
With so many plays after the B being two-digit numbers, it is pretty obvious in your (simpler) nacbrac that the within 10 convention is being applied, and even if all five plays do happen to end in point-zero (the chance of which is 1/10000), it is not going to leave a traumatic misimpression! Still, purists may prefer a comma (or other punctuation) at the changeover, like this:
- 63S-33 s[E B6.5, U20 D27 B30 R57 S62] "<31*20 10*5
Note David's proper use of asterisks. The seven plays have been rolled the following number of trials: 31k, 31k, 20k, 10k, 10k, 5k, 5k, respectively. An asterisk means that a number is repeated (unnecessary after the final number -- the 5 there means the rest of the plays are 5k).
For more on nacbracs, see this dissertation.
Nack