21$-41U-31H-52H-51H-41H-31 — Unlimited Games

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21$-41U-31H-52H-51H-41H-31 — Unlimited Games — 2-ply GnuBg Trunc

Posted By: Taper_Mike
Date: Monday, 24 June 2013, at 12:59 a.m.

In Response To: Inchoate backgame (Timothy Chow)

Note: My remarks are at the end of this post, but first, how would you play this 31?

The score (after 0 games) is: Opponent 0, Player 0
Move number 7: Player on roll, cube decision?

Opponent 160

Player 214
Position ID: 4HPkARFgjjwgWQ Match ID: cIkFAAAAAAAA

# Ply Move Equity

1 R bar/22 24/23 -0.584994

0.396094 0.073073 0.001830 - 0.603906 0.268877 0.020853 -0.422639 -0.584994

0.001641 0.000750 0.000080 - 0.001641 0.002007 0.000588 0.005206 0.009663

Truncated cubeful rollout (depth 5) with var.redn.

360 games, Mersenne Twister dice gen. with seed 686564436 and quasi-random dice

Play: world class 2-ply cubeful prune [world class]

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Skip pruning for 1-ply moves.

Cube: 2-ply cubeful prune [world class]

Different evaluations after 2 plies:

Play: 1-ply cubeful prune

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Cube: 2-ply cubeful prune [world class]

2 R bar/22 11/10 -0.651724 ( -0.066730)

0.387716 0.066075 0.001695 - 0.612284 0.283487 0.028593 -0.468877 -0.651724

0.001637 0.000738 0.000072 - 0.001637 0.002281 0.000723 0.005804 0.009978

Truncated cubeful rollout (depth 5) with var.redn.

360 games, Mersenne Twister dice gen. with seed 686564436 and quasi-random dice

Play: world class 2-ply cubeful prune [world class]

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Skip pruning for 1-ply moves.

Cube: 2-ply cubeful prune [world class]

Different evaluations after 2 plies:

Play: 1-ply cubeful prune

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Cube: 2-ply cubeful prune [world class]

3 R bar/24 8/5* -0.697155 ( -0.112161)

0.390664 0.068861 0.002138 - 0.609336 0.293652 0.039125 -0.480451 -0.697155

0.001802 0.000754 0.000095 - 0.001802 0.001969 0.000668 0.005834 0.014530

Truncated cubeful rollout (depth 5) with var.redn.

360 games, Mersenne Twister dice gen. with seed 686564436 and quasi-random dice

Play: world class 2-ply cubeful prune [world class]

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Skip pruning for 1-ply moves.

Cube: 2-ply cubeful prune [world class]

Different evaluations after 2 plies:

Play: 1-ply cubeful prune

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Cube: 2-ply cubeful prune [world class]

4 R bar/22 8/7 -0.797932 ( -0.212938)

0.369813 0.056998 0.001372 - 0.630187 0.322829 0.037191 -0.562024 -0.797932

0.001846 0.000776 0.000082 - 0.001846 0.002483 0.000918 0.006580 0.010651

Truncated cubeful rollout (depth 5) with var.redn.

360 games, Mersenne Twister dice gen. with seed 686564436 and quasi-random dice

Play: world class 2-ply cubeful prune [world class]

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Skip pruning for 1-ply moves.

Cube: 2-ply cubeful prune [world class]

Different evaluations after 2 plies:

Play: 1-ply cubeful prune

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Cube: 2-ply cubeful prune [world class]

5 R bar/22 6/5* -0.959382 ( -0.374387)

0.326276 0.038785 0.000728 - 0.673724 0.372041 0.047635 -0.727611 -0.959382

0.002106 0.000778 0.000057 - 0.002106 0.002853 0.000918 0.007375 0.012561

Truncated cubeful rollout (depth 5) with var.redn.

360 games, Mersenne Twister dice gen. with seed 686564436 and quasi-random dice

Play: world class 2-ply cubeful prune [world class]

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Skip pruning for 1-ply moves.

Cube: 2-ply cubeful prune [world class]

Different evaluations after 2 plies:

Play: 1-ply cubeful prune

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Cube: 2-ply cubeful prune [world class]

Annotation

Truncated Rollout by Taper_Mike
2013-Jun-23
Version GNU Backgammon 0.90-mingw 20120806
21$-41U-31H-52H-51H-41H-31-tm.sgf
[U B67 C112 b213 E374] /0.360t

21$-41U-31H-52H-51H-41H-31 — Unlimited Games
Bot Seed Equity Nacbracs Link

GnuBg 0.xx 2-ply Supremo 314159265 –157 [E U215] /15 Timothy Chow

GnuBg 0.xx 2-ply Trunc 686564436 –584.994 [U B67 C112 b213 E374] /0.360t Taper_Mike

XG 1.21 3-ply 1 –316 [C=U B4 b30 E111] /7 Timothy Chow

21$-41U-31H-52H-51H-41H-31 — Nactation Key
Family Nactation Traditional Notation Note

Both B bar/22, 11/10 By the 6pt Convention, a blot on the 10pt beats one on the 7pt.

Both b bar/22, 8/7 By the More Points Convention, making the 22pt beats entering on the 24pt.

Cross C bar/24, 8/5*

Each E bar/22, 6/5*

Hit H bar/24, 8/5* By the 6pt Convention, holding the 6pt is better than holding the 22pt.

Hit h bar/22, 6/5*

Up U bar/22, 24/23

Hit and split X bar/24, 8/5* By the 6pt Convention, holding the 6pt is better than holding the 22pt.

Hit and split x bar/22, 6/5*

Explanation of nacbracs

Like “This Old House” on PBS, I thought “this old post” could use a little renovation. The original rollouts by Timothy Chow show a large discrepency between GnuBg and XG1.
First, I cooked up a retro-sequence. It is well-played, but there are probably others.
Then, after running a GnuBg trunc, I wondered why my results were so different from Timothy’s. In his GnuBg rollout, the hara kiri play, E = bar/22 6/5*, was best. In my GnuBg trunc, E trails by 0.37, almost a quadruple whopper.
The only thing I could come up with was the fact that several early versions of GnuBg were later discovered to be buggy. In my notes, I list these three versions:

GnuBg 0.14.3-devel, 2-ply (buggy)

GnuBg 0.15-mingw, 2-ply (buggy)

GnuBg 0.16-mingw, 2-ply (buggy)

I’m not sure if that was the problem, but it is a possibility.
OTB, I would have played B (Both) = bar/22 11/10, making the second anchor, while playing the ace that keeps both forward and backward options open.
Mike

Opponent	160

Player	214
Position ID: `4HPkARFgjjwgWQ` Match ID: `cIkFAAAAAAAA`

21$-41U-31H-52H-51H-41H-31 — Unlimited Games
Bot	Seed	Equity	Nacbracs	Link
GnuBg 0.xx 2-ply Supremo	314159265	–157	[E U215] /15	Timothy Chow
GnuBg 0.xx 2-ply Trunc	686564436	–584.994	[U B67 C112 b213 E374] /0.360t	Taper_Mike
XG 1.21 3-ply	1	–316	[C=U B4 b30 E111] /7	Timothy Chow

21$-41U-31H-52H-51H-41H-31 — Nactation Key
Family	Nactation	Traditional Notation	Note
Both	B	bar/22, 11/10	By the 6pt Convention, a blot on the 10pt beats one on the 7pt.
Both	b	bar/22, 8/7	By the More Points Convention, making the 22pt beats entering on the 24pt.
Cross	C	bar/24, 8/5*
Each	E	bar/22, 6/5*
Hit	H	bar/24, 8/5*	By the 6pt Convention, holding the 6pt is better than holding the 22pt.
Hit	h	bar/22, 6/5*
Up	U	bar/22, 24/23
Hit and split	X	bar/24, 8/5*	By the 6pt Convention, holding the 6pt is better than holding the 22pt.
Hit and split	x	bar/22, 6/5*

Messages In This Thread

Inchoate backgame
Timothy Chow -- Thursday, 30 December 2010, at 6:57 p.m.
- Inchoate backgame
  Casper van der Tak -- Thursday, 30 December 2010, at 7:03 p.m.
- Inchoate backgame
  Bob Koca -- Thursday, 30 December 2010, at 8:48 p.m.
- Inchoate backgame
  phil simborg -- Thursday, 30 December 2010, at 11:42 p.m.
- Inchoate backgame
  Matt Cohn-Geier -- Friday, 31 December 2010, at 3:45 a.m.
  - Inchoate backgame
    mamabear -- Saturday, 1 January 2011, at 10:02 p.m.
- Inchoate backgame
  neilkaz -- Friday, 31 December 2010, at 5:12 a.m.
  - Inchoate backgame
    christian munk-christensen -- Sunday, 2 January 2011, at 5:22 p.m.
- Contradictory rollouts! Read all about it here
  Timothy Chow -- Friday, 31 December 2010, at 8:32 p.m.
  - Contradictory rollouts! Read all about it here
    Stick -- Friday, 31 December 2010, at 10:53 p.m.
    - Contradictory rollouts! Read all about it here
      Timothy Chow -- Saturday, 1 January 2011, at 12:41 a.m.
      - Contradictory rollouts! Read all about it here
        Stick -- Saturday, 1 January 2011, at 12:57 a.m.
- 21$-41U-31H-52H-51H-41H-31 — Unlimited Games — 2-ply GnuBg Trunc
  Taper_Mike -- Monday, 24 June 2013, at 12:59 a.m.
  - 21$-41U-31H-52H-51H-41H-31 — Unlimited Games — 2-ply GnuBg Trunc
    Stick -- Monday, 24 June 2013, at 1:58 a.m.
    - 21$-41U-31H-52H-51H-41H-31
      Taper_Mike -- Monday, 24 June 2013, at 3:41 a.m.
      - GNU version 1.00
        Neil Robins -- Tuesday, 25 June 2013, at 11:44 p.m.
        
        GNU version 1.00
        Michael Petch -- Wednesday, 26 June 2013, at 4:21 a.m.
        
        GNU version 1.00
        Taper_Mike -- Wednesday, 26 June 2013, at 5:36 a.m.
        
        GNU version 1.00
        Tom Keith -- Wednesday, 26 June 2013, at 1:03 p.m.
        
        GNU version 1.00
        Michael Petch -- Wednesday, 26 June 2013, at 3:49 p.m.
        
        GNU version 1.00
        Tom Keith -- Wednesday, 26 June 2013, at 4:50 p.m.
        
        GNU version 1.00
        Seth -- Friday, 28 June 2013, at 10:05 p.m.
      - 21$-41U-31H-52H-51H-41H-31
        Philippe Michel -- Wednesday, 26 June 2013, at 9:06 p.m.
      - 21$-41U-31H-52H-51H-41H-31
        Philippe Michel -- Wednesday, 26 June 2013, at 9:12 p.m.

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