Marvin 5.2.0

[Martin]

I have just released version 5.2.0 of Marvin. Based on my tests it is about 70 elo stronger compared to Marvin 5.1.0.

The NNUE architecture have changed slightly so old nets won't work anymore. A new default net is avaibale that is trained on 1B depth 8 positions from Marvin 5.1.0 (using NNUE eval). As before the net is included in the binaries package, but it can now also be downloaded separately from here, https://github.com/bmdanielsson/marvin-nets .

I also fixed some very annoying bugs:
* A problem when allocating large hash tables which is causing Marvin to perform very poorly in the current TCEC Swiss event
* A problem that could cause random crashes on Windows

For those interested the training code for NNUE nets have also seen some improvements, most notably the addition of a factorizer.

Binaries: https://github.com/bmdanielsson/marvin- ... tag/v5.2.0

[Frank Quisinsky]

Hi Martin,

good news.
Engine Update added in FCP Tourney-2022.

Thank you and good luck!!

Best
Frank

[matejst]

Very interesting engine: a good balance of evaluation and speed.

Thanks!

[Frank Quisinsky]

Hi,

results looks great for me.
A very nice update from a very interesting engine!

Best
Frank

[Gabor Szots]

Congratulations on the impressive progress, Martin.

[Rebel]

Marvin 5.2 for the GRL.

1600 games.

Elo pool : 3146

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

[Rebel]

Estimated elo gain for Marvin 5.2 : +122

Code: Select all

Gambit Rating List
Running      : Gauntlet Marvin 5.2
Time Control : Time control : 40/120
Games        : 1600

Results from file gauntlet-marvin.pgn:

No. Name           Win Draw Loss Unf.  Score Games       %
----------------------------------------------------------
  1 Marvin 5.2    +689 =627 -284   *0 1002.5  1600   62.7%
  2 Seer 2.1.0     +49  =77  -74   *0   87.5   200   43.8%
  3 Stash 31.0     +47  =72  -81   *0   83.0   200   41.5%
  4 Zahak 8.0      +35  =91  -74   *0   80.5   200   40.2%
  5 Weiss 1.4      +38  =82  -80   *0   79.0   200   39.5%
  6 Wasp 4.50      +35  =83  -82   *0   76.5   200   38.2%
  7 Halogen 10     +29  =83  -88   *0   70.5   200   35.2%
  8 Berserk 4.2.0  +26  =70 -104   *0   61.0   200   30.5%
  9 Clover 2.3.1   +25  =69 -106   *0   59.5   200   29.8%

Total Games:    1600
White Wins:      511 (31.9%)
Black Wins:      462 (28.9%)
Draws:           627 (39.2%)
Unfinished:        0 (0.0%)

Estimated elo gain for Marvin_5.2
Elo pool : 3146
Marvin 5.1 : 3105.0
Marvin_5.2 : 3227.5
Difference : 122.5

Wow...