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51$-31H-41H-63R-42P-32 Unlimited Games 2-ply GnuBg Trunc

Posted By: Taper_Mike
Date: Wednesday, 28 August 2013, at 9:55 p.m.

In Response To: 501 Essential Backgammon Problems #42 -- Rollout + Variants (Igor)


1O ' '2X1X2X '3X1O ' '5O

2X ' '1X '5O '3O ' ' '4X
51$-31H-41H-63R-42P-32
Position ID: WHPwADHgc/ARIA Match ID: cIkJAAAAAAAA

# Ply Move Equity
1 R 16/13 6/4* -0.124819
 
0.4752630.1307360.007440-0.5247370.1624400.006343 -0.080082 -0.124819
0.0008250.0009490.000208-0.0008250.0009380.000145 0.002063 0.004254
 
  Truncated cubeful rollout (depth 5) with var.redn.  
  360 games, Mersenne Twister dice gen. with seed 725099774 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 13/10 6/4* -0.139834 ( -0.015015)
 
0.4717320.1460970.011140-0.5282680.1847550.013779 -0.097834 -0.139834
0.0010820.0009980.000319-0.0010820.0011280.000274 0.002909 0.005280
 
  Truncated cubeful rollout (depth 5) with var.redn.  
  360 games, Mersenne Twister dice gen. with seed 725099774 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 16/11 -0.148497 ( -0.023679)
 
0.4679750.1241900.007084-0.5320250.1623260.005088 -0.100189 -0.148497
0.0007760.0007650.000166-0.0007760.0010880.000102 0.002123 0.003896
 
  Truncated cubeful rollout (depth 5) with var.redn.  
  360 games, Mersenne Twister dice gen. with seed 725099774 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 24/22 16/13 -0.187961 ( -0.063143)
 
0.4687880.1163190.006878-0.5312120.1823770.005782 -0.127386 -0.187961
0.0009800.0010820.000217-0.0009800.0011730.000109 0.002488 0.004143
 
  Truncated cubeful rollout (depth 5) with var.redn.  
  360 games, Mersenne Twister dice gen. with seed 725099774 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-Aug-28
Version GNU Backgammon 0.90-mingw 20120806
51$-31H-41H-63R-42P-32-tm.sgf
[X H15 S24 R63] /0.360t

51$-31H-41H-63R-42P-32 — Unlimited Games
Bot Seed Equity Nacbracs Link
GnuBg 0.xx 2-ply Supremo 871446556 91 [X H16 S50] /5 Timothy Chow
GnuBg 0.xx 2-ply Trunc 725099774 124.818 [X H15 S24 R63] /0.360t Taper_Mike (above)
XG 2.10 3-ply, Cubes: XGR 1 97 [X H9 S55 R59] "<=13*5 Paul Weaver
XG 2.10 XGR++ Eval [XGR++ seed] 83.5 [X H20 S43] "&e Taper_Mike
XG 2.10 3-ply, Cubes: XGR 94782038 102 [X H2 R51 S54] "<=46*2 Igor Erovenko

Key: H = Hit [13/10, 6/4*], R = Run[24/22, 16/13], S = Split [16/11], X = Hit and split [16/3, 6/4*]

Explanation of nacbracs

Except, perhaps, for the opening slot, 51$-31H-41H-63R-42P-32 is a well-played sequence that leads to this position.

Mike

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