[Bug-gnubg] Redouble ?

[Schaeferhjue]

Hi,
thanks for answering my last bug report so fast and very detailed indeed !

I don`t know if this is a bug at all, more likely I am to blame of
ignoring simple mathematical facts...but I have a faint feeling that
maybe there's something wrong with gnubg's cube analysis (at least
the fibs opponent of my nephew and I had missed the alleged redouble
proposed by GNUBG 0.14 Jul 2 2003).

IMHO it is not a redouble in a money game, but how about the redouble in
match play, especially in a 5-point match trailing 0-1 ?
Who of your guys can do the math exactly ?
Unfortunately I don't know much about taking points and match
equity tables, so could you please check if this redouble was correct ?

As an attachment you can find the *.pos-file (which one you might prefer?).

Thanks for any piece of advice !
Kindest regards

Hans-Jürgen Schäfer


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

Game number 2

Match Information:

Move number 40: O to play 62

 GNU Backgammon  Position ID: aQAA4AYAAAAAAA
                 Match ID   : AQGrAAAACAAA
 +12-11-10--9--8--7-------6--5--4--3--2--1-+     O: NN (Cube: 2)
 |                  |   |             O  O | OO  0 points
 |                  |   |             O  O | OO  Rolled 62
 |                  |   |                O | OO  
 |                  |   |                  | OO  
 |                  |   |                  | OO 
^|                  |BAR|                  |     5 point match
 |                  |   |                  | XX 
 |                  |   |                  | XX  
 |                  |   |                  | XX  
 |                  |   |       X          | XX  
 |                  |   |       X  X     X | XXX 1 point
 +13-14-15-16-17-18------19-20-21-22-23-24-+     X: Spock
Pip counts: O 7, X 12

* NN moves 2/off(2)
Alert: missed double ( -1,82%)! [bad]
Cube analysis
2-ply cubeless MWC  44,10% (Money:  +0,157)
  0,579 0,000 0,000 - 0,421 0,000 0,000
Cubeful equities:
1. Double, take         48,07%
2. Double, pass         57,63%  ( +9,56%)
3. No double            46,24%  ( -1,82%)
Proper cube action: Redouble, take

Rolled 62 (-1,518%):
*    1. Cubeful 0-ply    2/off(2)                     MWC:  45,85%
       0,511 0,000 0,000 - 0,489 0,000 0,000


Output generated Fri Jul 25 08:39:35 2003
by GNU Backgammon 0.14-devel (Text Export version 1.39)