Introducing Igel chess engine

[CMCanavessi]

Hello Alex,

PS: I like very much Igel and I hope that you will compile every new update also for Windows 11 ARM64

ARM64 is getting more and more traction these days both on Windows and macOS, so yes, I am definitely going to support this architecture now and in the future.

Do you have plans to support FRC?

[voffka]

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

[Gabor Szots]

Excellent news Volodymyr.

Note: I had to edit the makefile because it points to a previous net file.

[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?