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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

 gwEAQCoAAAAAAA:cAmgACAAGAAA       GNU Backgammon  Position ID: gwEAQCoAAAAAAA                    Match ID   : cAmgACAAGAAA    +24-23-22-21-20-19------18-17-16-15-14-13-+  O: gnubgOOO | O              O |   |                  |  2 points OO | O              O |   |                  |   OO |                  |   |                  |   OO |                  |   |                  |   OO |                  |   |                  |      |                  |BAR|                  |v 5 point match (Cube: 1) XX |                  |   |                  |   XX |                  |   |                  |   XX |                  |   |                  |   XX |                  |   |                  |  On rollXXX |    X     X  X  X |   |                  |  3 points    +-1--2--3--4--5--6-------7--8--9-10-11-12-+  X: Neil                Player       OpponentPosition          169           104   Cubeless equity               : +0.4707Owned cube                    : +0.6734Centered cube                 : +0.6598Opponent 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 ----- From: Michael Petch Sent: Saturday, September 05, 2009 10:04 AM Subject: Re: [Bug-gnubg] Use of Two-Sided DB in matches Whoa,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:http://www.bgonline.org/forums/webbbs_config.pl?noframes;read=47213Now 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:http://www.bgonline.org/forums/webbbs_config.pl?noframes;read=47327I 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:http://www.bgonline.org/forums/webbbs_config.pl?noframes;read=47359That 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. ThanksOn 05/09/09 2:06 AM, "Neil Robins" wrote: Those are the figures for opponent on roll.With you on roll it's:    Player       OpponentPosition          169           104Cubeless equity               : +0.4707Owned cube                    : +0.6734Centered cube                 : +0.6598Opponent owns cube            : +0.4490