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 on: December 29, 2014, 02:53:33 PM 
Started by MichaelP7 - Last post by Phaedrus
True I did not read the question well and realized that after hittinbb the enter button. Bet when you are able to read C code you can find the  answer in the code of gnubg which public.

 on: December 29, 2014, 02:37:05 PM 
Started by MichaelP7 - Last post by MichaelP7
Sorry guys but you are just repeating what GNU documentation says.
The data is all there and well understood the question is how did it compute the +2.84%??

 on: December 29, 2014, 02:17:31 PM 
Started by MichaelP7 - Last post by Phaedrus
from http://www.gnubg.org/documentation/doku.php?id=working_with_matches&s=luck

You can also adjust the classes for what GNU Backgammon considers lucky and unlucky rolls. The luck of a roll is defined as the differnce of equity after the best move after rolled dice and the equity after best move avergaged over all possible rolls.

 on: December 29, 2014, 12:47:08 PM 
Started by pilzgift - Last post by dorbel
Not hitting is, as Gnu told you, a big blunder. You are correct to say that generally speaking in this type of situation you want to avoid sending a fourth checker back, because it gives your opponent the chance to make a second anchor. Here though you pay a big price if you eschew the hit, because it leaves one of your men still on the ace point and it gives your opponent the opportunity to make a five prime with his next six or make his bar with an ace. It also allows him to play all of his next roll, notably 6-6, 3-3 and 6-3 his disaster rolls if he is on the bar, are now very bad for you. The swing on these four numbers alone is enormous. Even if he does make a 1-2 back game next turn, well that isn't very bad and certainly not as bad as the alternative.

 on: December 29, 2014, 11:35:05 AM 
Started by pilzgift - Last post by pilzgift
I have the following position in gnubg

 GNU Backgammon  Position ID: 2NbgADSMt4MBJA
                 Match ID   : cAk3AAAAAAAE
+13-14-15-16-17-18------19-20-21-22-23-24-+     O: gnubg
 | X           O  O |   | O  O  O  X     X |     0 points
 | X           O    |   | O  O  O          |     
 |                  |   |                  |     
 |                  |   |                  |     
 |                  |   |                  |   
v|                  |BAR|                  |     1 point match (Cube: 1)
 |                  |   |                  |   
 |                  |   | X                |     
 | O           X    |   | X                |     
 | O           X  X |   | X        X     O |     Rolled 65
 | O           X  X |   | X        X  O  O |     0 points
 +12-11-10--9--8--7-------6--5--4--3--2--1-+     X: pilzgift
                    Pip counts : O 163, X 140

The best play according to gnubg is to hit 24/18*/13. If he will re-enter from the bar, this will give him the opportunity to build a prime on the 2 and 1 point and the situation will possibly lead for him to play a back-game. I played against the advice of gnubg not hitting his 18 point and eventually won the game. Is it a good tactical decision to prevent the opponent to play back-games or prevent him to have a even number of checkers in my home (which can lead to a dangerous prime) as in this situation?

 on: December 29, 2014, 11:22:32 AM 
Started by MichaelP7 - Last post by dorbel
 The luck adjusted result is calculated as the actual result plus the total unnormalised luck rate. This is also called variance reduction of skill as described in Douglas Zare’s excellent article Hedging Toward Skill. This should give an unbiased measure of the strengths of the players. Whether it does or not is of course another matter!

 on: December 28, 2014, 08:47:05 PM 
Started by socksey - Last post by socksey
28 Dec 14

Supreme Champion:    sorrytigger
Worthy Adversary:    CaroLine
3rd place tie:    Lorac
5th place tie:    socksey

 on: December 28, 2014, 07:56:42 PM 
Started by MichaelP7 - Last post by MichaelP7
I am trying to understand the maths behind various GNU analysis parameters.
Got stuck on this.
Anyone knows how GNU calculates the Luck adjusted result?
I attach relevant image file

 on: December 27, 2014, 09:16:48 PM 
Started by socksey - Last post by socksey
27 Dec 14

Supreme Champion:    socksey
Worthy Adversary:    andreas
3rd place tie:    CaroLine

 on: December 26, 2014, 09:17:29 PM 
Started by zbilbo - Last post by socksey
26 Dec 14

Supreme Champion:    Nyo
Worthy Adversary:    socksey
3rd place tie:    kostasr
5th place tie:    rif_raf

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