BGonline.org Forums

21S-21S-32@-11E-652-65

Posted By: Nack Ballard
Date: Thursday, 8 July 2010, at 8:08 a.m.

In Response To: 21S-21S-32U-11e-65R-65? What!? (Tad Bright)

"21S-21S-32U-11e-65R-65"

In this post, I'll address the Nactation of the sequence. I made three changes:

21S-21S-32@-11E-652-65

Comments are below the diagrams.

21S-21S-32

For the U/V family (which is U, V, u, v, in expanded form), moving the lead checker always takes precedence over moving a trailing checker. Here, therefore, with a roll of 32, U = 23/18, V = 23/20 24/22, and u = 24/21 23/21.

So, strictly speaking, "u" rather than "U" is correct. It's such a clear play that it is unlikely someone will take U literally, but "u" removes all possible ambiguity.

A great symbol to use for this situation, though, is "@" for anchor (not yet in the tutorial). Perhaps you've seen it used at this forum, not knowing what it means. Now you do!

21S-21S-32@-11

An "E" (Each inner board) play moves a back checker/s for half the play, and for the other half of the play it moves checker/s in one's own inner board. And, as with most characters (with the exception of U/V), making a point takes preference over sliding a blot or blots.

So, from the starting position of your checkers (e.g., in reply to an opening 31), 11E is 24/23(2) 6/5(2), and 11e is 24/22 6/5(2).

In the position above, you cannot make a far side point with half your play (i.e., with two aces). But you still have to distinguish between 23/21 and 24/22. You break the tie in the same way you would with U/V or R/r or with the closest-to-6pt convention. The leading checker gets the primary (capital) letter and the trailing checker gets the secondary (lower case) letter.

In short, 11E is 23/21 6/5(2) (as played in your game sequence) and 11e is 24/22 6/5(2).

21S-21S-32@-11E-65

Here, R means 21/10, and r means 21/15 21/16. For the actual play made, 13/2, I recommend "2" for 2pt, or the appropriate member of the $ or O family.

Btw, $ (Slot, 13/8 11/5) looks like the best play for White's 65. Given that she has to leave 17 shots anyway, she may as well leave 4 additional shots and try to make a much better point.

Hope that helps.

Nack

Messages In This Thread

• 21S-21S-32U-11e-65R-65? What!?
  Tad Bright -- Thursday, 8 July 2010, at 2:16 a.m.
  • 21S-21S-32U-11e-65R-65? What!?
    Timothy Chow -- Thursday, 8 July 2010, at 4:19 a.m.
    • 21S-21S-32U-11e-65R-65? What!?
      Tad Bright -- Thursday, 8 July 2010, at 4:23 a.m.
      • 21S-21S-32U-11e-65R-65? What!?
        Casper van der Tak -- Thursday, 8 July 2010, at 5:23 a.m.
  • 21S-21S-32U-11E-652-65? What!?
    Nack Ballard -- Thursday, 8 July 2010, at 7:05 a.m.
  • 21S-21S-32@-11E-652-65
    Nack Ballard -- Thursday, 8 July 2010, at 8:08 a.m.
    • 21S-21S-32@-11E-652-65
      Stick -- Thursday, 8 July 2010, at 8:12 a.m.
  • 21S-21S-32U-11e-65R-65? What!?
    Stick -- Thursday, 8 July 2010, at 8:10 a.m.
  • 21S-21S-32U-11e-65R-65? What!?
    neilkaz -- Thursday, 8 July 2010, at 3:48 p.m.
    • 21S-21S-32U-11e-65R-65? What!?
      Stick -- Thursday, 8 July 2010, at 3:57 p.m.
      • 21S-21S-32U-11e-65R-65? What!?
        neilkaz -- Thursday, 8 July 2010, at 4:07 p.m.
        • 21S-21S-32U-11e-65R-65? What!?
          Stick -- Thursday, 8 July 2010, at 4:10 p.m.