Arasan 13.0

[jdart]

Arasan 13.0 is available from http://www.arasanchess.org.

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.
8) 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).

I have also made a few updates to the Arasan test suite (available at the same site).

[zullil]

One can only speculate about his PSTs.

Arasan 13.0 is available from http://www.arasanchess.org.

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.
8) 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).

I have also made a few updates to the Arasan test suite (available at the same site).

[Don]

What is the nature of the updates to the test suite? More problems? Problem removed?

I think it is a very nice suite - the problems are just about the right level of difiiculty for modern chess programs. In 5 or 10 years it will be too easy though

Don

Arasan 13.0 is available from http://www.arasanchess.org.

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.
8) 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).

I have also made a few updates to the Arasan test suite (available at the same site).

[jdart]

Testsuite changes are pretty minor. I dropped a couple of problems that were deemed problematic in previous discussion and added a couple at the end.

[Jamal Bubker]

Thanks Jon for these several changes done on your engine !

[fern]

Clearly, Jon, you copied a lot from Arasan 12....what a shame...


Fern

[Graham Banks]

Arasan 13.0 is available from http://www.arasanchess.org.

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.
8) 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).

I have also made a few updates to the Arasan test suite (available at the same site).

Thanks Jon.

[fern]

Jon:
It is just an ilusion or really Arasan, as looks to me, is searching deeper in middle game?

Fern

[jdart]

It is just an ilusion or really Arasan, as looks to me, is searching deeper in middle game?

This version does more pruning, so yes, generally it does search deeper.

-Jon

[kgburcham]

Jon Dart would you post the fen positions here.
I am having trouble downloading all of the positions.

thanks
kgburcham