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63S-43E-41?

Posted By: Nack Ballard
Date: Saturday, 13 February 2010, at 4:52 p.m.

In Response To: 63S-43W-41? (Ian Shaw)

For 63S-43, I have a Snowie full rollout of...

[Z S9 U29 T65 H67 c68 o69 N96] 20kZSU 5k

... and a Snowie truncated rollout of

[Z S7 U38 o58 c69 H75 T75 N79 C91 e94 $101 D101 E114 n149].

Nactation key: Z = 24/22 13/10, S = 24/21 13/11, U = 24/22 24/21, o = 13/10 8/4, c = 24/21 8/4, H = 8/1*, T = 13/6, N = 13/9 6/3, C = 24/20 8/5, e = 24/21 6/2, $ = 13/9 8/5, D = 13/10 13/9, E = 24/20 6/3, and n = 13/10 6/2.

Note that I changed the header from 63S-43W-41 to 63S-43E-41. I'll explain:

The rules for use of slotting symbols ($, W and &, meaning Slot, Wild, and double slot) are designed so that the best slotting plays are allocated the hierchal character. The priorities, in order, are:

(1) Slotting the 5pt or 4pt
(2) Unstacking the tallest (near-side) point
(3) Closest to 6pt

A "Wild" play is one that splits and slots. For the roll 43, there are four such plays. Only two of them meet the (1) criterion above: 24/20 8/5 and 24/21 8/4. Both of these meet criterion (2). 24/20 8/5 is preferred for criterion (3), so 24/20 8/5 is given the capital W. The lower-case "w" is given 24/21 8/4.

24/20 6/3 and 24/21 6/2 do not meet criterion (1), so they are assigned the italic W and w, respectively.

All four "Wild" plays are highly unorthodox with 63S-43, as you can see by the truncated rollout result. As it happens, in this position, w (24/21 8/4) is the least weak of the four plays (-.068 full, and -.069 trunc) and W, as played, is the weakest of the four (-.114, trunc); this has to do with specific duplications.

W is a stylish letter that is fun to use. However, if you're ever unsure of the slotting rules, it is safer to use the more robust E (Each) and C (Cross bar) for split+slot plays. The difference between the letters is that with the near-side half of the move, E is played within the inner board, while with C the source checker comes from the outer board and Crosses the bar.

Thus, in your second roll position of 63S-43, C is 24/20 8/5 and c is 24/21 8/4. E is 24/20 6/3 (the move played) and e is 24/21 6/2. (And, as mentioned, they are also W, w, W and w, respectively.)

For 63S-32, W is indeed 24/21 6/4, as you can tell by following the (1) (2) (3) criteria. w would be 24/22 8/5, and W would be 24/22 6/3. These plays are also E, c and e, respectively.

For other examples of E and C, read Section 3 (BEACON for Doublets) and Section 4 (BEACON for Non-doublets) here.

For what it's worth, for the third roll position 63S-43E-41, I like K (Kill, 6/5*/1*) rather than P (Point, 13/9 10/9), gaining a valuable tempo to hit on the 22pt or make the 18pt anchor. The 9pt is nice, but I find it painful to give White so many hit-and-cover numbers (66 65 64 63 61 52 41 31, etc) and she'll make the 20pt anchor with other 4s.

Nack

Messages In This Thread

• 63S-43W-41?
  Ian Shaw -- Saturday, 13 February 2010, at 1:15 p.m.
  • 63S-43W-41?
    Chuck Bower -- Saturday, 13 February 2010, at 4:05 p.m.
    • state-of the state-of-the-art
      Chuck Bower -- Saturday, 13 February 2010, at 4:29 p.m.
  • 63S-43W-41?
    Stick -- Saturday, 13 February 2010, at 4:06 p.m.
    • Wild
      David Rockwell -- Saturday, 13 February 2010, at 4:23 p.m.
  • 63S-43E-41?
    Nack Ballard -- Saturday, 13 February 2010, at 4:52 p.m.