Arasan 17.4

[jdart]

Arasan 17.4 is available from http://www.arasanchess.org.

Changes in Arasan 17.4:
1) Deeper LMR (and different reduction formula). After a LMR search
fails high, first re-search with no reduction but zero width bounds,
then only do a full-width, full-depth search.
2) Reduce q-search pruning margin.
3) Bug fix for pondering in Winboard mode. Engine could fail to ponder
again after a successful ponder.
4) Bug fixes to Winboard analysis mode.
5) Bug fix in Board::wouldAttack.
6) Widen somewhat the range of conditions that will prevent
a move from being pruned, based on the null-move threat (if
there is one).
7) Simpify & tune late-move pruning code and remove vestiges of history
pruning.
8) Add .EXPORT_ALL_VARIABLES target to Linux Makefile, to make build
targets work that depend on redefining CC etc.

Some test results (Linux, 1 CPU, 400 games, 4+1 time control, 8-move opening book):

Code: Select all

Rank Name          Elo    +    - games score oppo. draws
   1 Arasan 17.4  2415   14   14   400   55%  2385   54%
   2 Arasan-17.3  2385   14   14   400   45%  2415   54%

[Sedat Canbaz]

Many thanks dear Jon!

Today I started testing v17.3 under Arena GUI, but right now I am going to resume it with v 17.4


Btw, as before even this version too has loading-uploading problems under Fritz GUI

What can be the reason ?

Best,
Sedat

[jdart]

Can you be more specific?

I do sometimes run it under Fritz (version 13: I do not have 14). And both there and in Chessbase sometimes it is slow to terminate (5-10 seconds) but it does unload, at least for me.

--Jon

[Sedat Canbaz]

Can you be more specific?

I do sometimes run it under Fritz (version 13: I do not have 14). And both there and in Chessbase sometimes it is slow to terminate (5-10 seconds) but it does unload, at least for me.

--Jon

I am using Fritz 12 GUI, yes that's true... it terminates too slow approx. 5-10 sec

For conditions:
http://www.sedatcanbaz.com/chess/?page_id=809


Best,
Sedat

[jdart]

I will see what I can do to speed it up.

--Jon

[Sedat Canbaz]

I will see what I can do to speed it up.

--Jon

Great !

[Frank Quisinsky]

Hi Jon,

Good News for my FCT1 Qualification Tourney!
http://www.amateurschach.de/main/_qualification.htm

Tourney start: October 12th, 2014

42 days engine power from clone free developers!
I will try to give many information during the tourney.

Good luck with Arasan 17.4 x64!
I hope of many nice games!

Best
Frank

[Graham Banks]

Arasan 17.4 is available from http://www.arasanchess.org

Thanks Jon.
I'll stop my Arasan 17.3 testing later today and get started on this new version.

[Charly]

Hi,

It's a great new for me, since Arasan is one of my favorites engine since many years, with Ruffian and Phalanx, and so many others ! It will replace the 17.3 in my "League Karpov" soon !

Many thanks for this update !

Arnaud Loheac

ACCC (Arnaud's Computer Chess Corner)
http://aloheac.perso.neuf.fr/

[fern]

Do You say that it is a 2400 something engine?
I believed it was lot stronger than thaty...

Fern