Introducing Igel chess engine

[peter]

Hi Stéphane!

Hi Volodymyr,

I would like to use the "Night Nurse 0.2" net in fishtest for some tests in Stockfish, do you give me authorization to do so? The idea I have is to run the current Stockfish master net against the current Stockfish with Night Nurse 0.2 (I anticipate that Stockfish with Night Nurse 0.2 will be somewhat weaker, because the search is not optimized for this net), to estimate the Elo difference and maybe work on a contempt implementation for NNUE evals.

Thanks in advance,
Stéphane Nicolet

http://talkchess.com/forum3/viewtopic.p ... 41#p856741

https://github.com/dkappe/NetRunner/

Sorry for answering questions that were not adressed at me, dear Volodymyr regards

[dkappe]

Hi Volodymyr,

I would like to use the "Night Nurse 0.2" net in fishtest for some tests in Stockfish, do you give me authorization to do so? The idea I have is to run the current Stockfish master net against the current Stockfish with Night Nurse 0.2 (I anticipate that Stockfish with Night Nurse 0.2 will be somewhat weaker, because the search is not optimized for this net), to estimate the Elo difference and maybe work on a contempt implementation for NNUE evals.

Thanks in advance,
Stéphane Nicolet

Why not use Dark Horse 0.2? It’s maybe within 30 elo of sf12 with proper scaling.

https://www.patreon.com/posts/dark-horse-0-2-40419722

[carldaman]

Hi Volodymyr,

I would like to use the "Night Nurse 0.2" net in fishtest for some tests in Stockfish, do you give me authorization to do so? The idea I have is to run the current Stockfish master net against the current Stockfish with Night Nurse 0.2 (I anticipate that Stockfish with Night Nurse 0.2 will be somewhat weaker, because the search is not optimized for this net), to estimate the Elo difference and maybe work on a contempt implementation for NNUE evals.

Thanks in advance,
Stéphane Nicolet

Why not use Dark Horse 0.2? It’s maybe within 30 elo of sf12 with proper scaling.

https://www.patreon.com/posts/dark-horse-0-2-40419722

I salute Stéphane's idea to work on a contempt feature for SF-NNUE, but shouldn't he be asking you, Dietrich [creator of NiNu] for permission?

[dkappe]

Hi Volodymyr,

I would like to use the "Night Nurse 0.2" net in fishtest for some tests in Stockfish, do you give me authorization to do so? The idea I have is to run the current Stockfish master net against the current Stockfish with Night Nurse 0.2 (I anticipate that Stockfish with Night Nurse 0.2 will be somewhat weaker, because the search is not optimized for this net), to estimate the Elo difference and maybe work on a contempt implementation for NNUE evals.

Thanks in advance,
Stéphane Nicolet

Why not use Dark Horse 0.2? It’s maybe within 30 elo of sf12 with proper scaling.

https://www.patreon.com/posts/dark-horse-0-2-40419722

I salute Stéphane's idea to work on a contempt feature for SF-NNUE, but shouldn't he be asking you, Dietrich [creator of NiNu] for permission?

It’s publicly available. Why shouldn’t he use it?

[snicolet]

>> I salute Stéphane's idea to work on a contempt feature for SF-NNUE, but shouldn't he be asking you, Dietrich [creator of NiNu] for permission?
> It’s publicly available. Why shouldn’t he use it?

In fact I did also ask dkappe via Github
https://github.com/dkappe/NetRunner/com ... 403ba7c54d

So I interpret the question "It’s publicly available. Why shouldn’t he use it?" as an authorization, thanks!
Stéphane

[carldaman]

FYI, Dark Horse 0.2a appears to be the most aggressive nnue net in terms of playing style I've tested so far.

[voffka]

Igel 2.8.0 at https://github.com/vshcherbyna/igel/releases/tag/2.8.0 (binaries for Windows).

This release brings major improvements in strength due to a fix of a null move pruning bug. A tiny code change brings +54 elo at LTC (http://chess.grantnet.us/test/7463/). An updated Night Nurse net from Dietrich Kappe brings additional 10-20 elo.

What's new:

- Fix null move pruning bug (54 elo)
- Use 250cp as lazy eval threshold
- Improve time management for sudden death time controls
- Use Dietrich Kappe's Night Nurse improved net (internal version ninu-0.2.5b.nnue)

Regression tests against Igel 2.7.0 indicate:

+75 elo at 10+0.1
+120 elo at 10+0.0 (sudden death time control)

[Dokterchen]

Nice improvement! A first quick test shows that Igel is now among top 10 programs.

[Rebel]

Can you provide a pure popcount version without AVX?

[peter]

Can you provide a pure popcount version without AVX?

Preferably a SSE4.1-popcnt one, well for Xeon X5670?
regards