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21U

Posted By: David Rockwell
Date: Saturday, 26 December 2009, at 11:59 p.m.

In Response To: 21U (rew)

After 51S (Split 24-23, 13-8), playing 21S (24-23, 13-11) allows the checker on the 11 point to be hit with 63 and 54 in addition to 64. This is a huge difference between splitting here and splitting on the opening roll. Remember this fundamental. The value of developing the midpoint by leaving a blot in the outfield is related, in part, to how often it is hit. Nack and Paul's book discusses this concept frequently.

In the opening position, 13-11 generally plays very well because it is only hit with a 6-4. Even though the blot on the 11 doesn't add much to point making potential, it is often a strong move because of this. Look at the difference between an opening 32S (24-21, 13-11) and 32Z (reverse split 24-22, 13-10). The latter play is reasonable, but well known to be inferior. One of the reasons for this is that it is that it is hit in the outfield with four rolls rather than two. Make a habit of looking for these outfield hits. It may influence your choice of plays. For example, after the five point is made, a blot on the 10 is no longer hit by 54 from the ace. This improves the value of the move.

Messages In This Thread

• 21U
  rew -- Saturday, 26 December 2009, at 6:43 p.m.
  • 21U
    Andreas -- Saturday, 26 December 2009, at 9:07 p.m.
    • 21U
      rew -- Saturday, 26 December 2009, at 9:33 p.m.
  • 21U
    David Rockwell -- Saturday, 26 December 2009, at 11:59 p.m.
    • 21U
      Nack Ballard -- Sunday, 27 December 2009, at 1:12 a.m.
      • 21U
        David Rockwell -- Sunday, 27 December 2009, at 2:24 a.m.
        • 51S21U better as 51S21 $
          Andreas -- Sunday, 27 December 2009, at 11:16 a.m.
          • 51S21U better as 51S21 $
            David Rockwell -- Sunday, 27 December 2009, at 2:57 p.m.
            • 51S21U better as 51S21 $
              Andreas -- Sunday, 27 December 2009, at 4:06 p.m.
              • 51S21U better as 51S21 $
                David Rockwell -- Sunday, 27 December 2009, at 4:39 p.m.
              • Ask First!
                Stick -- Sunday, 27 December 2009, at 4:53 p.m.
                • Hmm.. so close
                  neilkaz -- Sunday, 27 December 2009, at 5:07 p.m.
                  • Hmm.. so close
                    Nack Ballard -- Sunday, 27 December 2009, at 5:53 p.m.
                • Ask First!
                  Nack Ballard -- Sunday, 27 December 2009, at 5:25 p.m.
                  • ok: I will expand to V after getting the file, ty *NM*
                    Andreas -- Monday, 28 December 2009, at 9:06 a.m.
                • Ask First!
                  Timothy Chow -- Sunday, 27 December 2009, at 6:50 p.m.
                • Ask First! - OK I will
                  David Rockwell -- Monday, 28 December 2009, at 2:11 a.m.
                  • 51S-43 XG RO
                    Stick -- Monday, 28 December 2009, at 2:30 a.m.
                    • 51S-43 XG RO
                      Nack Ballard -- Monday, 28 December 2009, at 6:56 a.m.
          • Nactation question etc etc
            neilkaz -- Sunday, 27 December 2009, at 4:42 p.m.
            • Nactation question etc etc
              Stick -- Sunday, 27 December 2009, at 4:49 p.m.
              • What about for a 43 play?
                neilkaz -- Sunday, 27 December 2009, at 5:04 p.m.
                • What about for a 43 play?
                  Nack Ballard -- Sunday, 27 December 2009, at 5:42 p.m.
                • What about for a 43 play?
                  Timothy Chow -- Sunday, 27 December 2009, at 6:24 p.m.
                  • What about for a 43 play?
                    neilkaz -- Monday, 28 December 2009, at 4:47 p.m.
          • 51S21U better as 51S21 $
            Nack Ballard -- Sunday, 27 December 2009, at 4:43 p.m.
    • 21U
      Chuck Bower -- Sunday, 27 December 2009, at 3:05 p.m.
      • 21U
        David Rockwell -- Sunday, 27 December 2009, at 4:40 p.m.
  • 21U
    Nack Ballard -- Sunday, 27 December 2009, at 1:09 a.m.