Search found 21 matches

by Martin
Thu Feb 13, 2020 5:44 pm
Forum: Computer Chess Club: General Topics
Topic: Marvin 3.5.0
Replies: 2
Views: 400

Marvin 3.5.0

Marvin 3.5.0 is now available. It's about 30 elo stronger than 3.4.0, and maybe 20 elo stronger than the version that played in TCEC S17. Most of the work for this release have been focused on the evaluation so that's where most of the improvements comes from. For the next release I plan to focus mo...
by Martin
Tue Jul 09, 2019 1:29 pm
Forum: Computer Chess Club: General Topics
Topic: Marvin 3.4.0
Replies: 2
Views: 708

Marvin 3.4.0

I have just released Marvin 3.4.0. My tests show a 100 elo improvement compared to version 3.3.2, but that's probably a bit optimistic. Most of the improvements comes from more aggressive LMP and improvements to history heuristic. I have also done some refactoring of the move generation and move sel...
by Martin
Sat Apr 20, 2019 1:47 pm
Forum: Computer Chess Club: General Topics
Topic: Marvin 3.3.0
Replies: 12
Views: 4122

Re: Marvin 3.3.0

After some additional testing I found two more issues with the book code and I think there are still more that I haven't found yet. I clearly haven't tested this code enough. I'm working on a few other things at the moment so it will take some time, but I will at least make sure to fix this before t...
by Martin
Wed Apr 17, 2019 9:20 pm
Forum: Computer Chess Club: General Topics
Topic: Marvin 3.3.0
Replies: 12
Views: 4122

Re: Marvin 3.3.0

I checked the code and if it gets to a position that's not in the book then it will stop checking the book for the rest of the game. So it will miss cases where the game transposes back to a position that is in the book. Could this explain the problems you're seeing?
by Martin
Tue Apr 16, 2019 8:26 pm
Forum: Computer Chess Club: General Topics
Topic: Marvin 3.3.0
Replies: 12
Views: 4122

Re: Marvin 3.3.0

Ingen har testat senaste releasen än, men jag gissar på ~2960 med 4 kärnor.
by Martin
Tue Apr 16, 2019 5:30 pm
Forum: Computer Chess Club: General Topics
Topic: Marvin 3.3.0
Replies: 12
Views: 4122

Re: Marvin 3.3.0

I have just done a second bug fix release, Marvin 3.3.2. This release fixes an issue where Marvin would sometimes fail to win in a
mate-in-x position.

Thanks to the user NajdorfB on GitHub for reporting the issue.
by Martin
Sat Apr 06, 2019 12:36 pm
Forum: Computer Chess Club: General Topics
Topic: Marvin 3.3.0
Replies: 12
Views: 4122

Re: Marvin 3.3.0

A new fixed version, Marvin 3.3.1, is now available.

https://github.com/bmdanielsson/marvin- ... tag/v3.3.1
by Martin
Sat Apr 06, 2019 11:41 am
Forum: Computer Chess Club: General Topics
Topic: Marvin 3.3.0
Replies: 12
Views: 4122

Re: Marvin 3.3.0

I just found a bug in the UCI commands I send to the GUI. The bug doesn't impact playing strength but GUIs may get confused. An updated version will come soon.
by Martin
Sat Apr 06, 2019 7:10 am
Forum: Computer Chess Club: General Topics
Topic: Marvin 3.3.0
Replies: 12
Views: 4122

Marvin 3.3.0

I have just released a new version of Marvin. 1 core: ~30 elo improvement 4 core: ~40 elo improvement For this release I found the source code of Ethereal and Arasan very helpful when working with improving the tuner. So a thank you to Andrew Grant and Jon Dart is in order. Apart from tuner improvem...
by Martin
Fri Mar 08, 2019 5:35 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: International Gsei Web Tournament VI Edition
Replies: 29
Views: 4937

Re: International Gsei Web Tournament VI Edition

Hi,

I would like to participate with Marvin. The current best version is the one that will play in TCEC S15.

https://drive.google.com/open?id=11wpgQ ... 14P3cbxnao

Regards
/Martin