Jun 27

Backgame 13 (2)

By ace Backgammon, Where Gnu errs Add comments

The score (after 10 games) is: gnubg 11, ace 9 (match to 17 points)

Move number 31: ace on roll, cube decision?


+-24-23-22-21-20-19-+---+-18-17-16-15-14-13-+
| 1O 2O 1X 2X 3X 2X |   | 1O  '  '  ' 1O  ' |
|                   | 1X|                   |
|                   |   |                   |
| 2X 2O 2X 2O 3O 3O | 2 |  ' 2X  '  '  '  ' |
+--1--2--3--4--5--6-+---+--7--8--9-10-11-12-+

Pip counts: gnubg 189, ace 147
Position ID: tBsAg1lmd4AQLA Match ID: UQkgArAASAAA


Alert: missed double ( -0.056)! [doubtful]

Cube decision
2-ply cubeless equity +0.575 (Money: +0.501)
  0.586 0.353 0.065 – 0.414 0.085 0.004
Cubeful equities:
1. Double, pass +1.000  
2. Double, take +1.176 +0.176
3. No double +0.944 -0.056
Proper cube action: Redouble, pass

 



Cube decision
Rollout cubeless equity +0.532 (Money: +0.466)
Cubeful equities:
1. No double +0.878  
2. Double, pass +1.000 +0.122
3. Double, take +0.649 -0.229
Proper cube action: No redouble, take (65.2%)
Rollout details
  Win W g W bg   Lose L g L bg Cubeless Cubeful
Player ace owns 2-cube 0.569 0.335 0.079 - 0.431 0.081 0.005 +0.532 +0.878
Standard error 0.004 0.003 0.004 - 0.004 0.002 0.001 0.010 0.022
Player gnubg owns 4-cube 0.517 0.285 0.134 - 0.483 0.067 0.008 +0.891 +0.649
Standard error 0.007 0.006 0.008 - 0.007 0.006 0.003 0.041 0.045
Full cubeful rollout with var.redn.
324 games, Mersenne Twister dice gen. with seed -882845220 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]

 

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