[Bug-gnubg] GNUBG gammon bug

[Schaeferhjue]

Hi,

I analysed a match my nephew had played on FIBS with GNUBG 0.14 (build
Jul 2 2003), analysis setting was supremo for checkerplay.
In the situation shown below GNUBG critised Spock's move as a huge blunder, but I can't see why; to the contrary, isn't GNUBG's evaluation extremely faulty ?
Thanks for any explanations !

melBOT (O, 1 pts) vs. Spock (X, 0 pts) (Match to 5)

Game number 2

Move number 72: X to play 33

GNU Backgammon  Position ID: FgAAwJ8dRAACAA
                Match ID   : QYmtABAAAAAA
+13-14-15-16-17-18------19-20-21-22-23-24-+     O: melBOT (Cube: 2)
|    X             |   |          O  O  X | OOO 1 point
|                  |   |             O    | OOO
|                  |   |                  | OO  
|                  |   |                  | OO  
|                  |   |                  | OO
v|                  |BAR|                  |     5 point match
|                  |   |          7       |    
|                  |   |          X       |     
|                  |   | X        X       |     
|                  |   | X  X     X       |     Rolled 33
|    X             |   | X  X     X       |     0 points
+12-11-10--9--8--7-------6--5--4--3--2--1-+     X: Spock
Pip counts: O 7, X 98

* Spock moves 14/5 11/8
Alert: very bad move (-9,664%)

Rolled 33 (+0,074%):
    1. Cubeful 2-ply    11/8 6/3(3)                  MWC:  14,85%
      0,000 0,000 0,000 - 1,000 0,419 0,235
    2. Cubeful 2-ply    14/11 6/3(3)                 MWC:  11,51% ( -3,35%)
      0,001 0,000 0,000 - 0,999 0,550 0,358
*    3. Cubeful 2-ply    14/5 11/8                    MWC:   5,19% ( -9,66%)
      0,002 0,000 0,000 - 0,998 0,799 0,589
    4. Cubeful 0-ply    14/5 6/3                     MWC:   3,83% (-11,03%)
      0,007 0,000 0,000 - 0,993 0,865 0,209
    5. Cubeful 0-ply    11/5 6/3(2)                  MWC:   3,76% (-11,09%)
      0,004 0,000 0,000 - 0,996 0,861 0,173


Output generated Fri Jul 18 18:01:33 2003
by GNU Backgammon 0.14-devel (Text Export version 1.39)

I didnt manage to copy the position directly from GNUBG into Wordpad
so that the position is shown right formatted, so I`ll post the appropriate
html-file and the pos-file as attachments, sorry for any inconvenience.


Kindest regards

Hans-Jürgen Schäfer

melbopa2.ZIP
Description: Zip archive