[Bug-gnubg] Suspect bearoff results

[Ian Shaw]

    GNU Backgammon  Position ID: qMduAwDYvmgDAA
                    Match ID   : cAkrAAAAAAAA
    +24-23-22-21-20-19------18-17-16-15-14-13-+  O: GnuBg
    |          O  O  O |   |       O  O  O  O |  0 points
    |                O |   |       O  O  O  O |  
    |                O |   |          O       |  
    |                O |   |                  |  
    |                  |   |                  |  
    |                  |BAR|                  |v 1 point match (Cube: 1)
    |                X |   |                  |  
    |                X |   |                  |  
    |                X |   |                  |  
    |          X  X  X |   |             X  X |  Rolled 62
    |          X  X  X |   | X        X  X  X |  0 points
    +-1--2--3--4--5--6-------7--8--9-10-11-12-+  X: Ian

Does it really make no difference what I play here? I guess it's possible since 
the position is so flexible, but I'd like reassurance that the database is 
working correctly.

Why is there a 2-ply or 0-ply evaluation when it is all being looked up in a 
database? The ply should be meaningless. It would make more sense to report 
BEAROFF-OS or something.

This also takes a lot longer to come up with a hint than if I use the race net 
(temporarily renaming gnubg_os.bd and restart). Is this to be expected? Are the 
results needlessly looked up multiple times for the different plies?

    1. Cubeful 2-ply    11/5 7/5                     Eq.:  +0.642
       0.821 0.000 0.000 - 0.179 0.000 0.000
        2-ply cubeful 100% speed [world class]
    2. Cubeful 2-ply    12/6 7/5                     Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        2-ply cubeful 100% speed [world class]
    3. Cubeful 2-ply    12/10 11/5                   Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        2-ply cubeful 100% speed [world class]
    4. Cubeful 2-ply    12/6 11/9                    Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        2-ply cubeful 100% speed [world class]
    5. Cubeful 2-ply    11/9 11/5                    Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        2-ply cubeful 100% speed [world class]
    6. Cubeful 0-ply    10/4 7/5                     Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        0-ply cubeful [expert]
    7. Cubeful 0-ply    12/10 12/6                   Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        0-ply cubeful [expert]
    8. Cubeful 0-ply    11/5 6/4                     Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        0-ply cubeful [expert]
    9. Cubeful 0-ply    11/5 10/8                    Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        0-ply cubeful [expert]
   10. Cubeful 0-ply    12/4                         Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        0-ply cubeful [expert]
   11. Cubeful 0-ply    12/6 10/8                    Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        0-ply cubeful [expert]
   12. Cubeful 0-ply    11/9 10/4                    Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        0-ply cubeful [expert]
   13. Cubeful 0-ply    11/3                         Eq.:  +0.642 ( -0.000)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        0-ply cubeful [expert]
   14. Cubeful 0-ply    12/6 5/3                     Eq.:  +0.642 ( -0.001)
       0.821 0.000 0.000 - 0.179 0.000 0.000
        0-ply cubeful [expert]
 

* On disk 1-sided bearoff database evaluator:
   - generated by GNU Backgammon
   - up to 15 chequers on 12 points (17383860 positions) per player
   - database includes gammon distributions
   - number of reads: 523044
 * In memory 1-sided bearoff database evaluator:
   - generated by GNU Backgammon
   - up to 15 chequers on 6 points (54264 positions) per player
   - database includes gammon distributions
   - number of reads: 124

Evaluator:      BEAROFF-OS