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Arasan 20.3
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Guenther Simon



Joined: 01 Oct 2008
Posts: 1980
Location: Regensburg, Germany

PostPost subject: Re: Arasan 20.3    Posted: Mon Nov 06, 2017 4:31 pm Reply to topic Reply with quote

jdart wrote:
Arasan 20.3 is available from https://www.arasanchess.org.

Changes in Arasan 20.3:

1) Change queen mobility scoring: square reach beyond 23 squares gets
same score.
2) Re-work scoring for material imbalance with pawns.
3) Bug fixes for EPD/FEN handling (mostly affects utility programs).
4) Bug fixes for bitbases. Mate scores from bitbases were not being
transmitted to the search. Also bitbase scores were being added to
other eval terms which are not relevant for KPK.
5) Syzygy code (Fathom) is imported as a git submodule now.
6) Code restructuring, move piece values into Param class.
7) Change eval scale so Pawn value = 128 (vs. 1000 in 20.2).
8) Implement UCI "searchmoves" option to "go" command.
9) Bug fixes in parameter tuner.
10) If special-case endgame detected, skip other endgame scoring and
just use the special-case code.
11) In UCI MultiPV mode, ensure bestmove that is eventually sent is the
highest-scoring move, and re-order PVs if necessary so that they are
in decreasing score order.
12) Implement BMI2 (PEXT/PDEP) attack computation.
13) Change evasion pruning in qsearch.
14) Pack hash entries into 2 64-bits words instead of 3.

This is close to, but not identical with, the version that is playing in TCEC 10.

In my testing it is measurably stronger than 20.2, but not by a whole lot.

--Jon


Thanks a lot Jon. It's incredible that ArasanX is still a living project after decades!
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Display posts from previous:   
Subject Author Date/Time
Arasan 20.3 Jon Dart Sun Nov 05, 2017 2:14 am
      Re: Arasan 20.3 Graham Banks Sun Nov 05, 2017 4:20 am
      Re: Arasan 20.3 Michael B Sun Nov 05, 2017 4:21 am
      Re: Arasan 20.3 Clemens Keck Sun Nov 05, 2017 7:14 am
      Re: Arasan 20.3 Dariusz Domagala Sun Nov 05, 2017 5:21 pm
            Re: Arasan 20.3 Damir Desevac Sun Nov 05, 2017 6:15 pm
                  Re: Arasan 20.3 Jon Dart Sun Nov 05, 2017 6:32 pm
                        Re: Arasan 20.3 Damir Desevac Sun Nov 05, 2017 6:41 pm
      Re: Arasan 20.3 Dann Corbit Sun Nov 05, 2017 10:58 pm
      Re: Arasan 20.3 Guenther Simon Mon Nov 06, 2017 4:31 pm
            Re: Arasan 20.3 Colin Gough Mon Nov 06, 2017 5:25 pm
                  Re: Arasan 20.3 Jon Dart Mon Nov 06, 2017 5:43 pm
                        Re: Arasan 20.3 Jon Dart Mon Nov 06, 2017 6:53 pm
                              Re: Arasan 20.3 Colin Gough Mon Nov 06, 2017 10:31 pm
                              Re: Arasan 20.3 T. Poppins Mon Dec 04, 2017 11:08 am
                                    Re: Arasan 20.3 Guenther Simon Mon Dec 04, 2017 11:50 am
                                          Re: Arasan 20.3 Jon Dart Mon Dec 04, 2017 2:06 pm
                                                Re: Arasan 20.3 T. Poppins Thu Dec 07, 2017 4:08 pm
      Re: Arasan 20.3 AA Ross Wed Nov 08, 2017 3:45 pm
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