New amateur chess engine Petrel

[Aleks Peshkov]

https://github.com/AleksPeshkov/petrel/ ... s/tag/v3.2

Version 3.2. Minor update.

• default NNUE file embedded in application
• more aggressive NMP and SEE-reductions
• added Static NMP
• fixed several search logic bugs that made search explore extra nodes
• refactoring, clean up from now unused PeSTO eval code

I expect version 3.2 gain 30-50 Elo. Petrel still misses many "must have" popular chess programming feautures and hides strength improvement potential.

P.S. Please do not use Petrel3.0. It is has huge eval bug that can lead to strange (bad) play. Petrel 3.1 is fine.

[Graham Banks]

Any Windows binaries yet?

[Aleks Peshkov]

Sorry, no windows binaries from me. I lay on Jim Ablett's Windows releases.

New version is not a big improvement, testers can continue to use Petrel 3.1. New petrel releases scheduled monthly.

[Gabor Szots]

src/main.cpp:1:10: fatal error: 'sysexits.h' file not found
1 | #include <sysexits.h>
| ^~~~~~~~~~~~
1 error generated.
make: *** [Makefile:127: build/main.o] Error 1

I don't know if sysexits.h is Linux specific or not. Could you not avoid using it?

[Aleks Peshkov]

src/main.cpp:1:10: fatal error: 'sysexits.h' file not found
1 | #include <sysexits.h>
| ^~~~~~~~~~~~
1 error generated.
make: *** [Makefile:127: build/main.o] Error 1

I don't know if sysexits.h is Linux specific or not. Could you not avoid using it?

Updated release (same version number). Note that my build chain assumes avx2-capable machine. NPS of petrel 3.2 should similar to petrel 3.1.

[Gabor Szots]

src/main.cpp:1:10: fatal error: 'sysexits.h' file not found
1 | #include <sysexits.h>
| ^~~~~~~~~~~~
1 error generated.
make: *** [Makefile:127: build/main.o] Error 1

I don't know if sysexits.h is Linux specific or not. Could you not avoid using it?

Updated release (same version number). Note that my build chain assumes avx2-capable machine. NPS of petrel 3.2 should similar to petrel 3.1.

Now it's the same as with version 3.1:

clang++: warning: argument unused during compilation: '-pthread' [-Wunused-command-line-argument]
C:/msys64/mingw64/bin/ld: C:/msys64/mingw64/bin/../lib/LLVMgold.dll: error loading plugin:
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Makefile:124: build/petrel] Error 1

I think I'll wait for Jim.

[Aleks Peshkov]

You may try GCC. Last time I tried it worked. Less NPS, but not much.
Remove '#" before

Code: Select all

#CXX = g++

in Makefile line 7

[Gabor Szots]

You may try GCC. Last time I tried it worked. Less NPS, but not much.
Remove '#" before

Code: Select all

#CXX = g++

in Makefile line 7

Thanks. That gave a couple of warnings but worked.