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Is there now coming changes to syzygy databases?
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Dann Corbit



Joined: 08 Mar 2006
Posts: 8052
Location: Redmond, WA USA

PostPost subject: Re: Is there now coming changes to syzygy databases?    Posted: Wed Nov 15, 2017 7:50 pm Reply to topic Reply with quote

syzygy wrote:
jwes wrote:
syzygy wrote:
I have adapted my generator for DTM, but DTM tables cannot replace WDL/DTZ. But they can be used in addition to WDL/DTZ to get mate distances (huge waste of disk space, though).

I am not yet finished.

Would it be possible to replace some DTZ tables with DTM if those tables have no cursed wins or blessed losses?

It would not be a perfect replacement.

Suppose the engine is on the losing side in KQvKR. The opponent can always win it within the 50-move rule, but he might play several suboptimal moves that bring the 50-move counter to, say, 25 moves with 26 moves remaining until the capture of the rook. So now the engine has a "blessed loss" within its reach, but without DTZ table it might not be able to tell and it might not play the right moves. (DTM would try to postpone the mate as much as possible, possibly at the cost of losing the rook a move or so earlier.)

Anyway, current Cfish is able to deal at the root with any of WDL+DTZ, WDL+DTM and WDL+DTZ+DTM.

In the search, Cfish will probe WDL at TB positions and then only probe DTM if the normal TB-win score is does not lead to a cutoff (i.e. if a win is already certain and the engine starts to look for the shortest win). This fits nicely with the early_mate approach. It is also possible to use 6-piece WDL(+DTZ) with 5-piece DTM.

Dumb question (I am sure others already know this):
So are there now Syzygy DTM files or does Cfish work with other DTM files like Gaviota TB?
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Subject Author Date/Time
Is there now coming changes to syzygy databases? Jouni Uski Mon Nov 13, 2017 10:09 am
      Re: Is there now coming changes to syzygy databases? Nguyen Pham Tue Nov 14, 2017 1:55 am
            Re: Is there now coming changes to syzygy databases? Jouni Uski Tue Nov 14, 2017 7:43 am
                  Re: Is there now coming changes to syzygy databases? Nguyen Pham Tue Nov 14, 2017 10:03 am
                        Re: Is there now coming changes to syzygy databases? Jon Fredrik Åsvang Tue Nov 14, 2017 1:28 pm
                        Re: Is there now coming changes to syzygy databases? Vael Jean-Paul Wed Nov 15, 2017 8:29 am
                              Re: Is there now coming changes to syzygy databases? Nguyen Pham Thu Nov 16, 2017 8:39 am
            Re: Is there now coming changes to syzygy databases? Ronald de Man Tue Nov 14, 2017 7:52 am
                  Re: Is there now coming changes to syzygy databases? Michel Van den Bergh Tue Nov 14, 2017 9:06 am
                  Re: Is there now coming changes to syzygy databases? J. Wesley Cleveland Tue Nov 14, 2017 10:53 pm
                        Re: Is there now coming changes to syzygy databases? Ronald de Man Tue Nov 14, 2017 11:13 pm
                              Re: Is there now coming changes to syzygy databases? J. Wesley Cleveland Wed Nov 15, 2017 12:53 am
                                    Re: Is there now coming changes to syzygy databases? Uri Blass Fri Nov 17, 2017 7:27 am
                              Re: Is there now coming changes to syzygy databases? Dann Corbit Wed Nov 15, 2017 7:50 pm
                                    Re: Is there now coming changes to syzygy databases? Ronald de Man Wed Nov 15, 2017 8:20 pm
                                          Re: Is there now coming changes to syzygy databases? Joshua Shriver Fri Nov 17, 2017 11:20 pm
                                                Re: Is there now coming changes to syzygy databases? Jouni Uski Tue Nov 21, 2017 9:07 pm
                                                      Re: Is there now coming changes to syzygy databases? Ronald de Man Tue Nov 21, 2017 9:51 pm
                                                            Re: Is there now coming changes to syzygy databases? Jon Fredrik Åsvang Tue Nov 21, 2017 10:41 pm
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