New engine releases & news 2021

[Rebel]

Nalwald 1.9 Release.
Biggest change is that evaluation parameters are now optimized using generic gradient descent. Additionally, piece square tables are now dependent on the enemy and own king position (one piece square table for each of the 64 squares the enemy king could be on and one piece square table for each of the 64 squares our own king could be on). I also added (and removed) some other evaluation features.

Self-play improvement for 40 seconds + 0.3 seconds on a fast CPU is around 140 Elo, few tests against two other engines (Raven 1.10, Loki 3.0) indicate that true improvement is closer to 90 Elo.

Nalwald 1.9 running for the GRL.

http://rebel13.nl/a/grl.htm

Made a promising start.

[Rebel]

Code: Select all

Gambit Rating List
Running      : Gauntlet Nalwald 1.9
Time Control : Time control 40/120
Games        : 500

Results from file gauntlet-Nalwald.pgn:

No. Name            Win Draw Loss Unf.  Score Games       %
-----------------------------------------------------------
  1 Nalwald 1.9    +234 =139 -127   *0  303.5   500   60.7%
  2 BitGenie 6.h64  +36  =25  -39   *0   48.5   100   48.5%
  3 Orion 05        +23  =33  -44   *0   39.5   100   39.5%
  4 Galjoen 0.41.2  +26  =23  -51   *0   37.5   100   37.5%
  5 Jumbo 0.7.0     +25  =24  -51   *0   37.0   100   37.0%
  6 Monolith 0.3    +17  =34  -49   *0   34.0   100   34.0%

Total Games:     500
White Wins:      184 (36.8%)
Black Wins:      177 (35.4%)
Draws:           139 (27.8%)
Unfinished:        0 (0.0%)

Estimated elo gain for Nalwald_1.9
Elo pool : 2554
Nalwald 1.8.1 : 2507.0
Nalwald_1.9 : 2618.0
Difference : 111.0

+111 elo.

Cool...

[WinPooh]

GreKo 2021.06 MP - multithreaded version:
http://greko.su/greko-2021.06.MP.zip

[Damir]

Thanks for the new Greko Vladimir. Unfortunately I don't see any Threads option in Greko params. There is only a Hash option... Are you sure it is supporting MP ?

[tmokonen]

I don't know if he re-uploaded or not, but I see a Threads option here (up to 4 threads).

[WinPooh]

Thanks for the new Greko Vladimir. Unfortunately I don't see any Threads option in Greko params. There is only a Hash option... Are you sure it is supporting MP ?

Do you see "Threads" option in reply to "uci" command in console mode?
It should look like this:

Code: Select all

GreKo 2021.06 MP (30-June-2021)

White(1): uci
id name GreKo 2021.06 MP
id author Vladimir Medvedev
option name Hash type spin default 128 min 1 max 4096
option name Strength type spin default 100 min 0 max 100
option name Threads type spin default 1 min 1 max 4
uciok

[Damir]

Yes Now I see it. Greko only supports 4 threads ?

[Damir]

Also tried it in Infinity GUI and it showed no Threads param... is nothing surprising as always when it comes to that GUI...

Fritz GUI is miles ahead of it.

[Damir]

And now the engine stopped responding when trying and play a game in Infinity GUI after 7 moves... was about to run out of time. Was trying it whitout a book.. In Fritz GUI it play with no problems with a book.

[WinPooh]

Also tried it in Infinity GUI and it showed no Threads param... is nothing surprising as always when it comes to that GUI...

Never tested with this GUI.
In Arena, Winboard/XBoard and Cutechess-Cli it works OK.
Yes, currently only 4 threads are supported.
Number of nodes is reported only for the main thread.