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Re: [Bug-gnubg] Use of Two-Sided DB in matches

From: Neil Robins
Subject: Re: [Bug-gnubg] Use of Two-Sided DB in matches
Date: Sat, 5 Sep 2009 10:36:52 +0100

    GNU Backgammon  Position ID: gwEAQCoAAAAAAA
                    Match ID   : cAmgACAAGAAA
    +24-23-22-21-20-19------18-17-16-15-14-13-+  O: gnubg
OOO | O              O |   |                  |  2 points
 OO | O              O |   |                  | 
 OO |                  |   |                  | 
 OO |                  |   |                  | 
 OO |                  |   |                  | 
    |                  |BAR|                  |v 5 point match (Cube: 1)
 XX |                  |   |                  | 
 XX |                  |   |                  | 
 XX |                  |   |                  | 
 XX |                  |   |                  |  On roll
XXX |    X     X  X  X |   |                  |  3 points
    +-1--2--3--4--5--6-------7--8--9-10-11-12-+  X: Neil
             Player       Opponent
Position          169           104
Cubeless equity               : +0.4707
Owned cube                    : +0.6734
Centered cube                 : +0.6598
Opponent owns cube            : +0.4490
Gives directly the probability of winning the match after Double/ Take and Automatic Redouble.
1.4707 divided by two = 0.73535.
What is the logic of using a more complicated formula here that is known to produce the wrong answer?
----- Original Message -----
Sent: Saturday, September 05, 2009 10:04 AM
Subject: Re: [Bug-gnubg] Use of Two-Sided DB in matches


It may be that I am dead tired and probably missing something. Can you give me the Gnubg ID (just the position) for your stats below? Because we are not looking at the same position. And I now see where all my confusion is coming from. Originally on BGO you posted this:


Now since I don’t have anyway of easily converting XBGid’s to Gnubg I decided to use the GnubgID from the data you retrieved from Gnubg in this post:


I have been blindly assuming that the 2 position were equal. After you posted below I realized they are different. In XBG you have the on roll person opposite to what you have for GnuBG. I have been copying and pasting the gnubgid out of this post all along. Its not the same.

However I just discovered in this post:


That its the same as your XBG. Can you clarify which position we are looking at? Right now, I am not analyzing the same one you are. I am confused. Thanks

On 05/09/09 2:06 AM, "Neil Robins" <address@hidden> wrote:

Those are the figures for opponent on roll.

With you on roll it's:

    Player       Opponent
Position          169           104

Cubeless equity               : +0.4707
Owned cube                    : +0.6734
Centered cube                 : +0.6598
Opponent owns cube            : +0.4490

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