BGonline.org Forums

43Z-64 and 43S-64

Posted By: Nack Ballard
Date: Thursday, 2 December 2010, at 10:18 p.m.

In Response To: 43Z-64 and 43S-64 (Paul Weaver)

One note about the result for 43Z-64. At scores for which 43Z is the best opening play with 43, (i.e., only but not always when Black leads in the match and White trails), 64P will be essentially tied or perhaps the best play.

Have you researched this? The reason I ask is that according to the rollouts I have, 43Z appears to be the best opener at gammon save, but the best reply according to the only rollout result I have (pasted below) is s[H P18] /5.

Assuming this result is valid, that suggests that the subsets of trailing scores where 43Z-64P is best would be "threading the needle" in the sense that P has to overtake R, but without H overtaking both P and R.

Nack

The score (after 0 games) is: gnubg 2, user 1 (match to 3 points, Crawford game)

gnubg	160
user	167
Position ID: 4HPhASLgc/ABMA Match ID: 8Al6ACAACAAA

• user moves 13/7 8/4*

#		Ply	Move	Equity
•	1	R	13/7 8/4*	+0.1701
			46.21 12.29 1.61 - 53.79 27.13 7.49 +0.1701 +0.1701 0.16 0.11 0.12 - 0.16 0.37 0.28 0.0043 0.0043
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 821653788 and quasi-random dice
			Play: 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 12 more moves within equity 0.16
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]
	2	R	8/2 6/2	+0.1518 ( -0.0182)
			45.83 11.76 1.26 - 54.17 22.49 4.08 +0.1518 +0.1518 0.11 0.09 0.10 - 0.11 0.35 0.20 0.0027 0.0027
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 821653788 and quasi-random dice
			Play: 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 12 more moves within equity 0.16
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]

Messages In This Thread

• 43Z-64^36 RO
  Claude Landry -- Thursday, 2 December 2010, at 3:21 p.m.
  • 43Z-64 and 43S-64
    Paul Weaver -- Thursday, 2 December 2010, at 3:52 p.m.
    • 43Z-64 and 43S-64
      David Rockwell -- Thursday, 2 December 2010, at 7:20 p.m.
      • 43Z-64 and 43S-64
        Nack Ballard -- Thursday, 2 December 2010, at 9:55 p.m.
        • 43Z-64 and 43S-64
          David Rockwell -- Thursday, 2 December 2010, at 10:51 p.m.
          • 32Z
            Nack Ballard -- Friday, 3 December 2010, at 1:04 a.m.
    • 43Z-64 and 43S-64
      Nack Ballard -- Thursday, 2 December 2010, at 10:18 p.m.
      • 43Z-64 and 43S-64
        David Rockwell -- Thursday, 2 December 2010, at 11:01 p.m.
        • 43Z-64 and 43S-64
          Stick -- Thursday, 2 December 2010, at 11:13 p.m.
          • 43Z-64 and 43S-64
            David Rockwell -- Thursday, 2 December 2010, at 11:44 p.m.
        • 54S-63 and 43Z-64
          Nack Ballard -- Friday, 3 December 2010, at 12:50 a.m.
          • 54S-63 and 43Z-64
            David Rockwell -- Friday, 3 December 2010, at 1:20 a.m.
            • 54S-63 and 43Z-64
              Nack Ballard -- Friday, 3 December 2010, at 1:46 a.m.
    • 43Z-64 and 43S-64
      Nack Ballard -- Thursday, 2 December 2010, at 10:36 p.m.
  • 43Z-64, data
    Nack Ballard -- Thursday, 2 December 2010, at 8:52 p.m.