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21U-64 and related positions

Posted By: Nack Ballard
Date: Wednesday, 7 April 2010, at 4:20 a.m.

In Response To: 21U 64? (Ian Shaw)

21U-64

53S-64

I was confronted with this unusual opening today. Does anyone have a rollout?

A couple of old Snowies. I have a truncated rollout [P R5 Z27], and a full-standard cube-adj. rollout [P R20] 5k. Your position (21U-64) is shown in the left-hand diagram above.

The similar 53S-64 is shown in the right-hand diagram. White has an extra checker on her 8pt (and one fewer on the midpoint). The trunc is [P R5] and the full-standard cube-adj. is [P R28]. Similar.

Compare with the commonly arising 43Z-64, shown below. An average of Snowie and Gnu rollouts is [R P20]. Note the duplication of White's 62 52 after Blue runs here that does not exist if Blue mistakenly plays R (runs) in either of the first two positions. Also, if White uses her 9pt builder to make a point, Blue's blitz threatened with 64P will be somewhat muted.

43Z-64

Finally, check out two more positions (scroll down). 43U-64 (left-hand diagram) has a bot average value of [P $11 H16 X33 Z43... R73]. 32U-64 (right-hand diagram) has a full-standard cube-adj. result of [P h8 Z30 H30 R44]. I'll let you draw your own conclusions.

Nactation key: P = Point (8/2 6/2), H = Hit (13/7 8/4*), Z = reverse split 24/20 13/7, h = hit (13/3*), $ = Slot (13/3), X = hit-and-split (24/18 8/4*), R = Run (24/14). Error sizes are in thousandths; e.g., [P $11 H16...] means P is best, $ is -.011, H is -.016, etc.

Nack

43U-64

32U-64

Messages In This Thread

• 21U 64?
  Ian Shaw -- Tuesday, 6 April 2010, at 12:34 p.m.
  • 21U-64 and related positions
    Nack Ballard -- Wednesday, 7 April 2010, at 4:20 a.m.
  • 21U 64?
    Stick -- Wednesday, 7 April 2010, at 12:59 p.m.
    • 21U 64?
      Ian Shaw -- Wednesday, 7 April 2010, at 3:26 p.m.
      • 21U 64?
        Stick -- Wednesday, 7 April 2010, at 3:37 p.m.
        • 21U 64?
          Nack Ballard -- Wednesday, 7 April 2010, at 11:32 p.m.
        • 21U 64?
          Ian Shaw -- Thursday, 8 April 2010, at 1:29 p.m.