Introducing Igel chess engine

[voffka]

Thank you Gabor.

I removed the old network reference.

[AlexChess]

Igel 3.1.0 at https://github.com/vshcherbyna/igel/releases/tag/3.1.0 (official executable binaries for Windows and IGN net).

This release brings adequate improvement in strength.

What's new:

- Scale eval at 1280
- More aggressive pruning of quiets when not improving
- Use 150 cp when razoring
- Avoid tt cutoff for rule50
- Improve statistics in SMP mode
- New network trained using 16B of d5-d8 data from Igel HCE/ign-1-139b702b with d16 validation using ign-1-139b702b

Regression run against Igel 3.0.5:

Long Time Control With Increment

Code: Select all

ELO   | 30.13 +- 2.64 (95%)
CONF  | 60.0+0.60s Threads=1 Hash=64MB
GAMES | N: 20000 W: 3906 L: 2176 D: 13918

Thank you Voffka and welcome back!
FREE Ukraine!

[Engin]

I need a version without AVX2 support, its crashed on my old AMD FX 8350 always, there is no version since 2.6 that not crashing.
popcount yes, but not AVX please !

[voffka]

Igel 3.2.0 at https://github.com/vshcherbyna/igel/releases/tag/3.2.0 (official executable binaries for Windows and IGN net).

This release brings adequate improvement in strength.

What's new:

- smaller margin for prunning quiets
- scale down eval to 1000
- history extensions only on non pv moves
- adjust scale formula
- less reductions in lmp when not improving
- negative extensions
- futility pruning improvements
- implement cutnode
- new network ign-1-9a48854b created by using prev network (ign-1-3e998e78) and re-trained with a different lambda

Regression run against Igel 3.1.0:

Long Time Control With Increment

Code: Select all

ELO   | 43.53 +- 3.13 (95%)
CONF  | 60.0+0.60s Threads=1 Hash=64MB
GAMES | N: 25000 W: 8152 L: 5036 D: 11812

Short Time Control With Increment

Code: Select all

ELO   | 41.22 +- 3.25 (95%)
CONF  | 10.0+0.10s Threads=1 Hash=8MB
GAMES | N: 25008 W: 8572 L: 5619 D: 10817

[Gabor Szots]

Nice improvement, Voffka. Also, long awaited.

[Wolfgang]

CEGT 40/4 running
https://cegt.forumieren.com/t1838-testi ... n-x64-1cpu

[bastiball]

Igel 3.2.0 at https://github.com/vshcherbyna/igel/releases/tag/3.2.0 (official executable binaries for Windows and IGN net).

This release brings adequate improvement in strength.

What's new:

- smaller margin for prunning quiets
- scale down eval to 1000
- history extensions only on non pv moves
- adjust scale formula
- less reductions in lmp when not improving
- negative extensions
- futility pruning improvements
- implement cutnode
- new network ign-1-9a48854b created by using prev network (ign-1-3e998e78) and re-trained with a different lambda

Regression run against Igel 3.1.0:

Long Time Control With Increment

Code: Select all

ELO   | 43.53 +- 3.13 (95%)
CONF  | 60.0+0.60s Threads=1 Hash=64MB
GAMES | N: 25000 W: 8152 L: 5036 D: 11812

Short Time Control With Increment

Code: Select all

ELO   | 41.22 +- 3.25 (95%)
CONF  | 10.0+0.10s Threads=1 Hash=8MB
GAMES | N: 25008 W: 8572 L: 5619 D: 10817

Congrats for the release and improvements!
Any chances implementing FRC?

[peter]

Igel 3.2.0 at https://github.com/vshcherbyna/igel/releases/tag/3.2.0 (official executable binaries for Windows and IGN net).
...
- new network ign-1-9a48854b created by using prev network (ign-1-3e998e78) and re-trained with a different lambda

Thanks for the new version!
To make the extra to be downloaded net getting used, just place it in same directory as the compile?
Thanks and regards again,

[Gabor Szots]

Igel 3.2.0 at https://github.com/vshcherbyna/igel/releases/tag/3.2.0 (official executable binaries for Windows and IGN net).
...
- new network ign-1-9a48854b created by using prev network (ign-1-3e998e78) and re-trained with a different lambda

Thanks for the new version!
To make the extra to be downloaded net getting used, just place it in same directory as the compile?
Thanks and regards again,

You don't have to download the net, it is included in the exe. It is there only for those who want to compile the code for themselves.

[peter]

Igel 3.2.0 at https://github.com/vshcherbyna/igel/releases/tag/3.2.0 (official executable binaries for Windows and IGN net).
...
- new network ign-1-9a48854b created by using prev network (ign-1-3e998e78) and re-trained with a different lambda

Thanks for the new version!
To make the extra to be downloaded net getting used, just place it in same directory as the compile?
Thanks and regards again,

You don't have to download the net, it is included in the exe. It is there only for those who want to compile the code for themselves.

Thanks, Gabor, thought so anyhow, (compile works without extra- net in directory as well as without it), just wanted to be sure