autochess

by **Thanderbyrd** » 18 Aug 2011 16:32

Changes in Arasan 13.0:
1) History pruning and see pruning are implemented.
2) Fixes to history code.
3) Code cleanup and parameter tweaking in evaluation, especially to
isolated pawns, pawn center scores, passed pawns, mobility, king safety.
4) Fixed bug in adjacent passer code.
5) Potential passer code is more accurate.
6) Material scoring changes: queen value is higher, re-introduced some
special case adjustments for bad trades.
7) Check extensions have been reduced to 3/4 ply.

Hash table code cleanup & bug fixes.
9) Intel C++ supported under Windows.
10) GUI edit menu allows paste of PGN and FEN from the clipboard into the GUI.
11) fix GUI memory leak.
12) By default, Arasan will play a somewhat wider variety of openings (the book selectivity option can be used to change this).

http://www.arasanchess.org/downld.shtml

by **Thanderbyrd** » 23 Aug 2011 13:38

http://www.arasanchess.org/downld.shtml

by **Thanderbyrd** » 03 Oct 2011 05:16

http://www.arasanchess.org/downld.shtml

by **matematiko** » 03 Oct 2011 22:15

To copmplement Thanderbyrd's post, I quote from another forum:

jdart wrote:Arasan 13.2 is available from http://www.arasanchess.org.

Changes in Arasan 13.2:
1) Fix in search to eliminate some unnecessary re-searches.
2) Fixes to material scoring for unbalanced material positions.
3) Simplified bonus code for Bishop in endgames with pawns on both sides.
4) Revised bonus for trading material when ahead.
5) Misc. scoring fixes, esp. for connected rook on 7th.
6) Utility programs such as makebook now do not create a log file.
7) Another/better fix for UCI output after a quick mate.

For the first time, a pre-built Intel Mac binary is available.

I ran a 400 1:0 game test match on Linux against 13.1, both engines with 2 cores, ponder on, and 13.2 scored +150 -114 =136 (54.5%) or about +30 ELO. Your mileage may vary.

--Jon

by **XsupremeX** » 15 Nov 2011 03:55

Arasan 13.3

http://www.arasanchess.org/arasan13.3.exe

by **XsupremeX** » 08 Dec 2011 01:00

Arasan 13.4

Changes in Arasan 13.4:

1 ) Fixes to UCI analysis mode.
2 ) Fix handling of UCI Threads option.
3 ) Arasan GUI allows changing thread count for search.
4 ) Support "cores," "memory" and "egt" features in Winboard. Note: Arasan
command-line switches take precedence over Winboard settings.
5 ) Memory for the evaluation cache is now dynamically allocated and
is sized relative to the main hash table.
6 ) Some changes to pruning and lazy eval logic.
7 ) Fixed faulty bitbase data. Fixed "eval" command to handle bitbase
and tablebase probes properly.
8 ) Improve UCI time management for very short time controls.

http://www.arasanchess.org/arasan13.4.exe