-
I accidentally inverted colors, but it's unimportant. Nactations for the third and fifth roll plays of your game sequence are discussed below.
-
                         |
| ||||
| XGID=-b----E-C--AcD--ad-e-A--A-:0:0:-1:64:0:0:3:0:10 | |||||
54D-32S-64 | |||||
With 64, Blue plays 24/14*. The areal option for this play is R (Run), which is the letter you chose. (For an explanation and overview of areal letters, see section 5 of the Nactation tutorial, which starts on page 15.)
The style alternative (and the one more commonly used) for this 24/14* play is H (Hit). Perhaps you avoided H because you thought it might also apply to 13/7 8/4*. However, if someone were to hit on the lower point number, it would be nactated with a lower case "h." A similar example of 43Z-62 (found at the same link) is mentioned in the second paragraph below position #8 (page 7).
For one who has not yet learned the hit-more-6 rule (which in part states that the capital letter hits on the higher point), it is usually quite adequate to apply "assumption" (explained in section 8) -- in other words, you may use your common sense. Naturally, Blue would rather Hit (H) on her 14pt than hit (h) on her 4pt.
-
     |
| ||||
| XGID=-a----E-C-AacC--ad-e-B--A-:0:0:-1:15:0:0:3:0:10 | |||||
54D-32S-64R-43S-51 | |||||
Here, Blue's play of 24/23 14/9 can be nactated Z (reverse split), meaning that the smaller number (the ace) is played on the far side (24/23) and the larger number is brought down (14/9).
You can also use S (Split). This normally means that the larger number is played on the far side and the smaller number comes down. When it is not possible to do that (as with Blue's 51 here), there is a convenience clause that allows you to use S -- easier for many people to remember because it is the first letter in Split. (For anyone who doesn't like or know the convenience clause, it is perfectly fine to use Z.)
Perhaps you avoided S or Z because you saw that Blue has more than one way to bring her 5 down. True, but herein lies the purpose of the hit-more-6 rule. The "more" part of the rule stands for the more points convention, which awards the capital letter to the play making the extra point. Hence, S or Z = 24/23 14/9, and s or z = 24/23 13/8.
For 51 in this position, U means 24/18, strictly speaking. Granted, you can apply assumption, with the logic that 14/9 is the obvious 5, and you are nactating the non-obvious portion of the move (standard assumptive technique), which is the ace played Up (U) to the 23pt. The "problem" with that is that it leaves no way to nactate the 24/18 play!
One might argue that R could be (resourcefully but illegally) shoe-horned in for that purpose, but it's a slippery slope. One can more reasonably argue that it doesn't matter because nobody will ever play 24/18 in this position; fair enough. It is worth keeping in mind, though, that if someday you convey 24/23 14/9 as U to a computer program (for example, when Xavier makes it possible to feed nactated game sequences into XG), it will interpret it as 24/18.
For S, Z and the convenience clause, and for U, see positions #5, 6 and 7 (on pages 5 and 6) of the tutorial. For the hit-more-6 rule, see section 10, which starts on page 48. [For the higher-number first directive (which seldom arises but here it categorizes 14/8 as in the D family and not the S or Z family, in case anyone wondered), see page 64.]
Nack