Jun 28

3-Point Anchor (2)

By ace Backgammon, Where Gnu errs Add comments

This one is discovered by Daniel “Raccoon” Murphy, first published  in GammonU.

The score (after 0 games) is: gnubg 4, ace 2 (match to 19 points)

Move number 2: ace on roll, cube decision?


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

Pip counts: gnubg 138, ace 108

Position ID: bG/AAA4xdzeAAA Match ID: cAlgAkAAEAAA

• ace doubles

Cube decision
2-ply cubeless equity +0.545 (Money: +0.544)
0.747 0.080 0.001 – 0.253 0.032 0.000
Cubeful equities:
1. Double, take +0.951
2. Double, pass +1.000 +0.049
3. No double +0.884 -0.067
Proper cube action: Double, take


Cube decision
Rollout cubeless equity +0.575 (Money: +0.572)
Cubeful equities:
1. Double, pass +1.000
2. Double, take +1.124 +0.124
3. No double +0.921 -0.079
Proper cube action: Double, pass
Rollout details
Win W g W bg Lose L g L bg Cubeless Cubeful
Centered 1-cube 0.761 0.076 0.001 - 0.239 0.027 0.000 +0.575 +0.921
Standard error 0.002 0.002 0.000 - 0.002 0.001 0.000 0.004 0.011
Player gnubg owns 2-cube 0.785 0.071 0.001 - 0.215 0.022 0.000 +1.264 +1.124
Standard error 0.003 0.003 0.000 - 0.003 0.001 0.000 0.012 0.018
Full cubeful rollout with var.redn.
324 games, Mersenne Twister dice gen. with seed 160819169 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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