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Database storage methods
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Don Dailey



Joined: 29 Apr 2008
Posts: 4320
PostPost subject: Re: Database storage methods    Posted: Sat Mar 10, 2012 10:44 pm Reply to topic Reply with quote
Edmund wrote:

Furthermore I disagree with Bob regarding the "Most just store a huge file of zobrist hash signatures.". When talking about engines here I suppose you are describing opening books and not databases in general. The problem with this method here is that it invites unwanted transpositions.
e.g. after 1. e4 e5 2. Nf3 a6 3. Bb5 the opening book would suggest the transposition into the well known line with Nc6.
The most streight forward countermesure is to not only calculate hash values of positions but also add the move into the equation.


I think Bob didn't mean that literally. He was probably talking about the polyglot format. That is a pretty sensible way to store a book.
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Subject Author Date/Time
Database storage methods david nash Thu Mar 08, 2012 10:56 am
      Re: Database storage methods Ed Schroder Thu Mar 08, 2012 11:59 am
            Re: Database storage methods Julien MARCEL Thu Mar 08, 2012 12:33 pm
                  Re: Database storage methods david nash Thu Mar 08, 2012 12:43 pm
                  Re: Database storage methods Martin Sedlak Thu Mar 08, 2012 1:00 pm
                        Re: Database storage methods Julien MARCEL Thu Mar 08, 2012 1:13 pm
                              Re: Database storage methods david nash Thu Mar 08, 2012 1:32 pm
                              Re: Database storage methods Martin Sedlak Thu Mar 08, 2012 1:45 pm
                                    Re: Database storage methods Julien MARCEL Thu Mar 08, 2012 1:51 pm
                        Re: Database storage methods Ed Schroder Thu Mar 08, 2012 3:42 pm
                  Re: Database storage methods Ed Schroder Thu Mar 08, 2012 3:46 pm
                  Re: Database storage methods Robert Hyatt Thu Mar 08, 2012 10:54 pm
                        Re: Database storage methods Julien MARCEL Thu Mar 08, 2012 11:53 pm
                              Re: Database storage methods Robert Hyatt Fri Mar 09, 2012 12:18 am
                              Re: Database storage methods Edmund Moshammer Fri Mar 09, 2012 12:51 am
                                    Re: Database storage methods H.G.Muller Fri Mar 09, 2012 9:29 am
                                          Re: Database storage methods Don Dailey Sat Mar 10, 2012 10:25 pm
                                                Re: Database storage methods Edmund Moshammer Sun Mar 11, 2012 12:27 am
                                                      Re: Database storage methods Don Dailey Sun Mar 11, 2012 5:25 am
                                    Re: Database storage methods Don Dailey Sat Mar 10, 2012 10:44 pm
                                    Re: Database storage methods Ronald de Man Sat Mar 10, 2012 11:45 pm
            Re: Database storage methods david nash Thu Mar 08, 2012 12:40 pm
      Re: Database storage methods H.G.Muller Thu Mar 08, 2012 4:36 pm
            Re: Database storage methods david nash Thu Mar 08, 2012 5:03 pm
                  Re: Database storage methods H.G.Muller Thu Mar 08, 2012 5:28 pm
                        Re: Database storage methods david nash Thu Mar 08, 2012 8:48 pm
      Re: Database storage methods Harald Lüßen Thu Mar 08, 2012 8:45 pm
            Re: Database storage methods david nash Thu Mar 08, 2012 8:51 pm
      Re: Database storage methods Nguyen Pham Thu Mar 08, 2012 10:39 pm
      Re: Database storage methods Vincent Diepeveen Sun Mar 11, 2012 6:41 am
            Re: Database storage methods david nash Sun Mar 11, 2012 4:49 pm
                  Re: Database storage methods Vincent Diepeveen Sun Mar 11, 2012 4:58 pm
                        Re: Database storage methods david nash Sun Mar 11, 2012 5:51 pm
      Re: Database storage methods Vincent Diepeveen Sun Mar 11, 2012 7:03 am
            Re: Database storage methods Vincent Diepeveen Sun Mar 11, 2012 7:21 am
            Re: Database storage methods Edmund Moshammer Sun Mar 11, 2012 9:21 am
                  Re: Database storage methods Vincent Diepeveen Sun Mar 11, 2012 3:41 pm
                        Re: Database storage methods david nash Sun Mar 11, 2012 5:08 pm
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