[Bug-gnubg] bad move?

[Ned Cross]

Either I'm confused, or GNU is with this crashed position.  Evals show the selected move as a huge blunder, while a quick rollout shows them to be very close.

 

-Ned

 

______________________

 

 

JLee (O, 2 pts) vs. warmbeach (X, 2 pts) (Match to 5)

 

Game number 4

 

Move number 49: X to play 12

 

 GNU Backgammon  Position ID: TZ0ABD7eBQAAAA
                 Match ID   : QYmoACAAEAAA
 +13-14-15-16-17-18------19-20-21-22-23-24-+     O: JLee (Cube: 2)
 |             O    |   | O  O  O     O  O |     2 points
 |                  |   | O           O    |    
 |                  |   | O                |    
 |                  |   |                  |    
 |                  |   |                  |   
v|                  |BAR|                  |     5 point match
 |                  |   |                O | X 
 |                  |   |             X  O | X  
 |                  |   |          X  X  O | X  
 |                  |   |          X  X  O | XX  Rolled 12
 |                O |   |       X  X  X  O | XX  2 points
 +12-11-10--9--8--7-------6--5--4--3--2--1-+     X: warmbeach

 

* warmbeach moves 4/3 2/off
Alert: very bad move ( -0.002)

 

Rolled 12 (+0.245):

 

    1. Cubeful 2-ply    4/2 3/2                      Eq.:  +1.547
       0.916 0.767 0.317 - 0.084 0.000 0.000
        2-ply cubeful 100% speed, 8 cand., 0.16 tol. [world class]
*   2. Cubeful 2-ply    4/3 2/off                    Eq.:  +1.290 ( -0.257)
       0.872 0.625 0.390 - 0.128 0.000 0.000
        2-ply cubeful 100% speed, 8 cand., 0.16 tol. [world class]

 

 

     1. Rollout          4/2 3/2                      Eq.:  +1.665
       0.935 0.825 0.744 - 0.065 0.000 0.000 CL  +1.685 CF  +1.665
      [0.002 0.005 0.015 - 0.002 0.000 0.000 CL   0.009 CF  +0.009]
        Truncated cubeful rollout (depth 15) with var.redn.
        1296 games, seed 1149056128 using Mersenne Twister
        Play and cube: 0-ply cubeful [expert]
*    2. Rollout          4/3 2/off                    Eq.:  +1.663 ( -0.002)
       0.941 0.810 0.760 - 0.059 0.000 0.000 CL  +1.657 CF  +1.663
      [0.003 0.005 0.178 - 0.003 0.000 0.000 CL   0.010 CF  +0.011]
        Truncated cubeful rollout (depth 15) with var.redn.
        1296 games, seed 1149056128 using Mersenne Twister
        Play and cube: 0-ply cubeful [expert]
     3. Cubeful 0-ply    3/off                        Eq.:  +0.411 ( -1.254)
       0.607 0.440 0.297 - 0.393 0.000 0.000

 

Output generated Mon Aug 12 12:25:56 2002
by GNU Backgammon 0.12 (Text Export version 1.15)