[Bug-gnubg] Estimated Pip count bug

[Ned Cross]

GNU is reversing the pip counts under "analysis/one-checker race" for the quoted position. GNU sems to have it right everywhere else, but the Estimated Pip Count is off, showing white to have only 47% CPW.

 

Ned

 

 

_______________________________________________________

 

black (O, 0 pts) vs. white (X, 0 pts) (Match to 5)

 

Game number 1

 

Move number 41: X to play 21

 

 GNU Backgammon  Position ID: 6B4AALJ1AAAAAA
                 Match ID   : UQmlAAAAAAAA
 +13-14-15-16-17-18------19-20-21-22-23-24-+     O: black
 |                  |   | O  O  O          | OO  0 points
 |                  |   | O  O             | OO 
 |                  |   | O  O             | O  
 |                  |   | O                | O  
 |                  |   |                  | O 
v|                  |BAR|                  |     5 point match
 |                  |   |                  | X 
 |                  |   |                  | X  
 |                  |   | X                | X  
 |                  |   | X     X  X       | X   Rolled 21
 |                  |   | X  X  X  X     X | XX  0 points
 +12-11-10--9--8--7-------6--5--4--3--2--1-+     X: white (Cube: 2)
Pip counts: O 43, X 38

 

* white moves 6/4 1/off
Alert: missed double ( -0.170)! [very bad]
Cube analysis
2-ply cubeless equity  +0.483 (Money:  +0.483)
  0.742 0.000 0.000 - 0.258 0.000 0.000
Cubeful equities:
  2-ply cubeful 100% speed [world class]
1. Double, take         +0.981
2. Double, pass         +1.000  ( +0.019)
3. No double            +0.811  ( -0.170)
Proper cube action: Redouble, take
Alert: unlucky roll! ( -0.325)

 

Rolled 21 (-0.325):
*    1. Cubeful 2-ply    6/4 1/off                    Eq.:  +0.507
       0.607 0.000 0.000 - 0.393 0.000 0.000
     2. Cubeful 2-ply    4/2 1/off                    Eq.:  +0.504 ( -0.003)
       0.604 0.000 0.000 - 0.396 0.000 0.000
     3. Cubeful 2-ply    3/off                        Eq.:  +0.496 ( -0.011)
       0.603 0.000 0.000 - 0.397 0.000 0.000
     4. Cubeful 2-ply    6/5 4/2                      Eq.:  +0.454 ( -0.053)
       0.587 0.000 0.000 - 0.413 0.000 0.000
     5. Cubeful 2-ply    6/4 3/2                      Eq.:  +0.446 ( -0.060)
       0.585 0.000 0.000 - 0.415 0.000 0.000
     6. Cubeful 2-ply    6/5 6/4                      Eq.:  +0.433 ( -0.074)
       0.582 0.000 0.000 - 0.418 0.000 0.000

 

Output generated Mon Sep 01 14:39:34 2003
by GNU Backgammon 0.14-devel 1.1290 030823 (Text Export version 1.55)

 

 

 

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