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I checked with Nack about the issue of forced moves in the H (Hit) family. His short answer is that the sort of semi-forced plays discussed by Tim can, and often should, be assumptively nactated using H. This, even though a strict Nactation forbids it. (Assumptive Nactation is explained in the Nactation Tutorial.) Nack’s complete response is given below. Mike Hello Mike, After I finish Part 2 of the tutorial, I’ll be back on BgOnline... I’m afraid of the time sump if I start reading other posts. In the meantime, I appreciate your willingness to be a conduit. Your 32U-64 response post to Chase was perfect. The modern definition of H: Hit once, hit loose. Priority: Hit on highest point. Either the entire move hits or if there is one portion left over it is played “down” (to or within the outer board). Forced and entering portions are waived. [If there is more than one way to play “down,” break ties with more/6.] If the leftover portion cannot be played down or if there is more than one leftover portion, the move is not in the H family. This update simplifies the definition of H, so that (a) it is not used in situations that are complex to interpret, and (b) there are a greater number of moves for which one can assumptively use H (and other style letters) free of conflict with strict interpretation.
In Tim’s (bearoff) diagram , 6/2* 5/3 is not in the H family, because there are three legal ways to play the deuce (6/4, 5/3, and 2/0). As you guessed, the interpretation of “forced” is NOT meant to include hitting first and then deciding if the remaining portion(s) is forced. Granted, by assumption, 6/2*/0 can be H (surely one wouldn’t volunteer a second blot), and a nactator might well prefer H to figuring out which member of the I (Inside) family is proper.
In your (backgame) diagram, there are still two legal ways to play the deuce and therefore H cannot be strictly used. However, in this case assumptive use is not only preferable but compelling, because there is only one legal move that hits. Only a computer would balk. As you and I have discussed, when in doubt, avoid using style letters with doublets, because of the leftover portions. OTOH, there are times where using H with doublets is at least fine (and sometimes preferable to the areal alternative); e.g., 64S-22H = 24/16*, 63S-22H = 13/7* 13/11, 63R-53H-33H = b/22 24/15*, and 54S-63H-65K-44H = b/21(2) 13/5. | ||||||||||||||||||
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Nack