Playing against a weaker CSTal

[chesstal]

Hi all

Because I wanted to play against CSTal and have some chance to beat it created a weakening wrapper - all AI under my directions.

zip file: https://murena.io/s/WXb2C3bemZbGtcJ.

1. wrapper.c is main code. I used Windows/mingw gcc to compile it:
gcc wrapper.c -o wrapper.exe -O2 -static -static-libgcc -static-libstdc++ -lm
2. wrapper.pdf explains code and how to use it.

Install wrapper.exe as a normal UCI engine.

Only did limited testing to calibrate - so it can be tuned more. But it works and produces results close to a weakened stockfish.

The code can weaken any engine by changing the engine name in wrapper.c and calibrating again.

I hope some of you find it useful and improve it further.

[Rebel]

I have read your PDF, it's a good system and indeed will work for many Stockfish versions also.

[Rowen]

Hi all

Because I wanted to play against CSTal and have some chance to beat it created a weakening wrapper - all AI under my directions.

zip file: https://murena.io/s/WXb2C3bemZbGtcJ.

1. wrapper.c is main code. I used Windows/mingw gcc to compile it:
gcc wrapper.c -o wrapper.exe -O2 -static -static-libgcc -static-libstdc++ -lm
2. wrapper.pdf explains code and how to use it.

Install wrapper.exe as a normal UCI engine.

Only did limited testing to calibrate - so it can be tuned more. But it works and produces results close to a weakened stockfish.

The code can weaken any engine by changing the engine name in wrapper.c and calibrating again.

I hope some of you find it useful and improve it further.

Hi
Is someone able to release a compiled version of this please?

[chesstal]

Hi
Is someone able to release a compiled version of this please?

Hi Rowen

I didnt include the exe because of all the false virus problems Martin reported with Myracle. Anyway I have uploaded the exe : https://murena.io/s/5Q9fw7qtKT4DejM

It works on my windows machine. Hope it works for you.

Also tuning is optional - you can use wrapper with any engine by changing the engine name with the UCI option and using the default weakening values in the code.

[chesstal]

I have read your PDF, it's a good system and indeed will work for many Stockfish versions also.

Thanks for the comments Ed.

If you are interested I ran the same test with Rebel-EAS-3.0-AVX2 and the CSTal calibration.

1400: -0 Elo
1550: +23 Elo
1700: -17 Elo
1850: +49 Elo
2000: -12 Elo
2150: +2 Elo
2300: -7 Elo
2450: -51 Elo
2600: +21 Elo

So the default calibration weakens your engine well.