Andscacs - New version 0.83

[cdani]

Hi.
I published a new version of Andscacs, 0.83

http://www.andscacs.com/andscacs083.zip

Changes:
* Solved little bugs.
* Slight improvements on king safety.
* Improved prunes, null move and lmr.
* Improved main hash.
* Some small speed improvements.
* Improved evaluation of passed pawns.
* Improved evaluation of rooks, knights and bishops.
* Small improvements on multi processor mode.

It's maybe 20 elo stronger or a little more.

Was really difficult, most ideas I try do not work; nothing extraordinary to happen, of course

[Werner]

Thanks Daniel,
yes we know - it is not easy to improve an engine when you are under the best 20th of the world!

best wishes

[mar]

Congratulations Daniel

[cdani]

Thanks all!
To give a little idea of the evolution:

Code: Select all

100' + 0.03 0.82
Rank Name                Elo    +    - games score oppo. draws 
 1 Komodo 5.1r2 64-bit   107   40   39   198   69%   -33   24%
 2 Elektro 1.2            43   37   37   200   62%   -33   34%
 3 BlackMamba 2.0 x64     21   38   38   198   58%   -33   26%
 4 Protector 1.8.0         8   37   36   198   56%   -33   36%
 5 Texel 1.05 64-bit      -1   37   37   198   55%   -33   31%
 6 Nirvanachess 2.1c      -7   36   36   200   54%   -33   37%
 7 Naum 4.6              -16   38   37   200   53%   -33   27%
 8 Hannibal 1.5 x64      -26   36   36   198   51%   -33   41%
 9 Andscacs 0.82         -33   12   12  1986   45%     3   32%
10 Senpai 1.0            -45   37   37   198   48%   -33   32%
11 Gull 1.2 x64          -51   37   37   198   47%   -33   30%

100' + 0.03 0.83
Rank Name                Elo    +    - games score oppo. draws 
 1 Komodo 5.1r2 64-bit   144   28   28   380   72%    -4   32%
 2 Elektro 1.2            61   28   27   384   59%    -4   27%
 3 BlackMamba 2.0 x64     52   27   27   384   58%    -4   32%
 4 Protector 1.8.0        20   26   26   378   54%    -4   42%
 5 Texel 1.05 64-bit       0   27   27   384   51%    -4   32%
 6 Andscacs 0.82206       -4    9    9  3819   49%     0   33%
 7 Hannibal 1.5 x64      -35   27   27   380   45%    -4   33%
 8 Nirvanachess 2.1c     -40   26   26   384   44%    -4   35%
 9 Naum 4.6              -45   26   27   384   44%    -4   34%
10 Senpai 1.0            -61   27   27   378   42%    -4   30%
11 Gull 1.2 x64          -92   27   28   383   37%    -4   30%

[supersharp77]

Hi.
I published a new version of Andscacs, 0.83

http://www.andscacs.com/andscacs083.zip

Changes:
* Solved little bugs.
* Slight improvements on king safety.
* Improved prunes, null move and lmr.
* Improved main hash.
* Some small speed improvements.
* Improved evaluation of passed pawns.
* Improved evaluation of rooks, knights and bishops.
* Small improvements on multi processor mode.

It's maybe 20 elo stronger or a little more.

Was really difficult, most ideas I try do not work; nothing extraordinary to happen, of course

Thank You!! Keep Up the good work my friend...testing shows your very close to the top....some loses hard to explain...depth seems to not be the issue.....loses games in late middlegame....fades late....cause unknown
in my opinion.....Thx AR

[Graham Banks]

Hi.
I published a new version of Andscacs, 0.83

http://www.andscacs.com/andscacs083.zip

Changes:
* Solved little bugs.
* Slight improvements on king safety.
* Improved prunes, null move and lmr.
* Improved main hash.
* Some small speed improvements.
* Improved evaluation of passed pawns.
* Improved evaluation of rooks, knights and bishops.
* Small improvements on multi processor mode.

It's maybe 20 elo stronger or a little more.

Was really difficult, most ideas I try do not work; nothing extraordinary to happen, of course

Thanks Daniel.

[Manza]

Good news and congratulations Daniel !!

[Frank Quisinsky]

Very nice to see how strong is your work if we are looking in all the older versions. I hope that you have a long time fun on computer chess.

I added your new version on my ToDo list.

Thanks!

Best
Frank

[Sylwy]

THANK YOU !

[cdani]

Some detailed changes that maybe someone will like to implement in his engine:
* Optimized a little the prefetches.
* Added idea of re-search at intermediate depth if reduction is very high from Stockfish.
* In move ordering, a little penalization for move king outside rank 0 when queens.
* Do not consider pawn shelter of king when in center.
* Grouped half of the hash entry in a single uint64_t.
* Added the idea "If both sides have only pawns, score for potential unstoppable pawns" of Stockfish.
* Increased bonus for bishop pair that cannot be exchanged for other bishop or knights of rival because it does not have them.
* Diminish bonus for bishop pair if the rival knights are good or the center is very blocked.
* Diminish attack value if only one attacker.
* If rival has more pawns in front of king, increase safety penalization. Idea from Hakkapelitta.
* Increased penalization for underdevelopment on some piece configurations.