Jul 01

One back vs High Anchor (1)

By ace Backgammon, Where Gnu errs Add comments

The score (after 9 games) is: gnubg 6, ace 11 (match to 17 points)

Move number 37: ace on roll, cube decision?

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

Pip counts: gnubg 104, ace 105
Position ID: tnnGACB22wgBAw Match ID: cAkgAmAAWAAA

• ace doubles

Alert: wrong double ( -0.072)! [bad]

Cube decision
2-ply cubeless equity +0.450 (Money: +0.424)
  0.668 0.152 0.003 – 0.332 0.064 0.001
Cubeful equities:
1. No double +0.546  
2. Double, pass +1.000 +0.454
3. Double, take +0.473 -0.072
Proper cube action: No double, take (13.8%)

 


Cube decision
Rollout cubeless equity +0.471 (Money: +0.475)
Cubeful equities:
1. Double, take +0.725  
2. Double, pass +1.000 +0.275
3. No double +0.677 -0.048
Proper cube action: Double, take
Rollout details
  Win W g W bg   Lose L g L bg Cubeless Cubeful
Centered 1-cube 0.692 0.147 0.002 - 0.308 0.056 0.002 +0.471 +0.677
Standard error 0.001 0.002 0.000 - 0.001 0.001 0.000 0.003 0.007
Player gnubg owns 2-cube 0.712 0.144 0.002 - 0.288 0.054 0.002 +1.080 +0.725
Standard error 0.001 0.002 0.000 - 0.001 0.001 0.000 0.007 0.011
Full cubeful rollout with var.redn.
1296 games, Mersenne Twister dice gen. with seed -311120583 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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