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Hamsters randomizer in action
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Gerd Isenberg



Joined: 08 Mar 2006
Posts: 1786
Location: Hattingen, Germany
PostPost subject: Re: Hamsters randomizer in action    Posted: Mon Jun 04, 2007 7:12 am Reply to topic Reply with quote
Tony wrote:

Well.., yes.

Not having this code means that search will find out that the pawn promotes, meaning most of the time it becomes very inefficient.

Having it implemented wrong (fe an off by 1 wrt stm) would give more of a "I'm winning", "No I'm not" beheavior every other iteration, while the former can hide it with horizon moves (and will) and give less score jumps.

Tony


I have this zugzwang in mind:

[D] 8/3p4/3p4/3P3k/4PKp1/6P1/8/8 b - -
   ::    ::    ::    ::
::    :: BP ::    ::    
   ::    BP    ::    ::
::    :: WP ::    :: BK
   ::    :: WP WK BP ::
::    ::    ::    WP    
   ::    ::    ::    ::
::    ::    ::    ::    


If your eval recognizes this as drawish, your search will almost try to reach this position as a leaf with black to move. It interacts with path-dependencies from hash. Avoidrep-pruning becomes quite efficient.

Beside possible passer and square of king issues, co-ordinating squares might be even more important in this kind of endings.

Alessandro may have some bugs in eval or search (hashing) - therefor it is important to get the wrong evaluated positions from the primary variations.

Gerd
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Subject Author Date/Time
Hamsters randomizer in action Alessandro Scotti Sun Jun 03, 2007 7:24 pm
      Re: Hamsters randomizer in action Gerd Isenberg Sun Jun 03, 2007 8:25 pm
            Re: Hamsters randomizer in action Alessandro Scotti Sun Jun 03, 2007 8:33 pm
                  Re: Hamsters randomizer in action Gerd Isenberg Sun Jun 03, 2007 8:43 pm
      Re: Hamsters randomizer in action Michael Sherwin Mon Jun 04, 2007 2:04 am
      Re: Hamsters randomizer in action Pradu Kannan Mon Jun 04, 2007 2:33 am
      Re: Hamsters randomizer in action Tony Mon Jun 04, 2007 3:35 am
            Re: Hamsters randomizer in action Pradu Kannan Mon Jun 04, 2007 6:24 am
                  Re: Hamsters randomizer in action Tony Mon Jun 04, 2007 6:47 am
                        Re: Hamsters randomizer in action Gerd Isenberg Mon Jun 04, 2007 7:12 am
      Re: Hamsters randomizer in action H.G.Muller Mon Jun 04, 2007 10:26 am
            Re: Hamsters randomizer in action Tony Mon Jun 04, 2007 11:13 am
                  Re: Hamsters randomizer in action H.G.Muller Mon Jun 04, 2007 11:49 am
            Re: Hamsters randomizer in action Alessandro Scotti Mon Jun 04, 2007 3:47 pm
                  Re: Hamsters randomizer in action Guetti Mon Jun 04, 2007 4:21 pm
                  Re: Hamsters randomizer in action H.G.Muller Mon Jun 04, 2007 6:16 pm
                        Re: Hamsters randomizer in action Alessandro Scotti Tue Jun 05, 2007 10:47 am
                              Re: Hamsters randomizer in action H.G.Muller Tue Jun 05, 2007 11:53 am
                                    Re: Hamsters randomizer in action Alessandro Scotti Tue Jun 05, 2007 12:39 pm
                                          Re: Hamsters randomizer in action H.G.Muller Tue Jun 05, 2007 1:13 pm
                                                Re: Hamsters randomizer in action Uri Blass Tue Jun 05, 2007 1:27 pm
                                                      Re: Hamsters randomizer in action H.G.Muller Tue Jun 05, 2007 1:46 pm
                                                            Re: Hamsters randomizer in action Uri Blass Tue Jun 05, 2007 10:33 pm
                                                Re: Hamsters randomizer in action Alessandro Scotti Wed Jun 06, 2007 10:32 pm
                                                      Re: Hamsters randomizer in action Alessandro Scotti Thu Jun 07, 2007 12:01 am
                                                            Re: Hamsters randomizer in action Pradu Kannan Thu Jun 07, 2007 8:13 am
                                                                  Re: Hamsters randomizer in action Alessandro Scotti Thu Jun 07, 2007 6:01 pm
                  Re: Hamsters randomizer in action Spock Mon Jun 04, 2007 7:17 pm
      Re: Hamsters randomizer in action Ron Murawski Tue Jun 05, 2007 10:23 pm
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