[Bug-gnubg] Jacoby Rule Bug - GNU reporting Too Good for Initial Double

[Ned Cross]

The following position is an example of GNU reporting a position as Too Good for initial double in a Jacoby-Rule Moneygame.  I have attached the full tmg file for reference. I have the sgf available, but did not post to the list as it is 200kb.

 

Running 0.14 build CVS 1.1198 on WinME.

 

Ned

 

________________________________

red (O, 0 pts) vs. white (X, 4 pts) (money game)

 

Game number 3

 

Match Information:

 

red's rating: n/a
white's rating: n/a
Date: July 23, 2003
Event: n/a
Round: n/a
Place: TrueMoneyGames (http://www.truemoneygames.com)
Annotator: n/a
Comments: n/a
Move number 8: O on roll, cube decision?

 

 GNU Backgammon  Position ID: 4PPgAGicHeEFAg
                 Match ID   : MAEAAAAAIAAA
 +12-11-10--9--8--7-------6--5--4--3--2--1-+     O: red
 | X        O       |   | O  O     O     X |     0 points
 | X                |   | O  O     O       |     On roll
 | X                |   | O        O       |    
 |                  |   |                  |    
 |                  |   |                  |   
^|                  |BAR|                  |     (Cube: 1)
 |                  |   | X                |   
 | O           X    |   | X                |    
 | O           X    |   | X                |    
 | O           X    | X | X                |    
 | O  O        X    | X | X  O             |     4 points
 +13-14-15-16-17-18------19-20-21-22-23-24-+     X: white
Pip counts: O 132, X 175

 

* red moves 13/9

 

Cube analysis
2-ply cubeless equity  +1.021
  0.772 0.489 0.032 - 0.228 0.043 0.001
Cubeful equities:
  2-ply cubeful 100% speed [world class]
1. No double            +1.005
2. Double, take         +1.887  ( +0.881)
3. Double, pass         +1.000  ( -0.005)
Proper cube action: Too good to double, pass (0.6%)

 

Rolled 31 (-0.044):
*    1. Cubeful 2-ply    13/9                         Eq.:  +0.988
       0.762 0.392 0.031 - 0.238 0.041 0.001
     2. Cubeful 2-ply    14/10                        Eq.:  +0.983 ( -0.005)
       0.766 0.399 0.032 - 0.234 0.041 0.001
     3. Cubeful 2-ply    13/10 6/5                    Eq.:  +0.983 ( -0.006)
       0.762 0.413 0.033 - 0.238 0.044 0.001
     4. Cubeful 2-ply    13/10 9/8                    Eq.:  +0.980 ( -0.008)
       0.765 0.414 0.034 - 0.235 0.043 0.001
     5. Cubeful 2-ply    14/11 6/5                    Eq.:  +0.980 ( -0.008)
       0.758 0.397 0.031 - 0.242 0.044 0.001
     6. Cubeful 2-ply    9/5                          Eq.:  +0.979 ( -0.009)
       0.756 0.396 0.029 - 0.244 0.043 0.001

 

Output generated Fri Jul 25 21:22:55 2003
by GNU Backgammon 0.14-devel 1.1198 030722 (Text Export version 1.48)

 

 

red - white 1050485.tmg
Description: Binary data