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There is lots of stuff on evaluation tuning in this forum, see for example this thread:
http://talkchess.com/forum3/viewtopic.php?f=7&t=75234. Most people are automating it now. You can try changing values manually and see how that performs but you are not likely to find optimal values that way.

ChessBase is just essential IMO. Go ahead, pay the $$$, prepare to be hooked.

But for analysis, should also mention the Chess Cloud Database project: https://www.chessdb.cn/queryc_en/. Live book you can query, and you can submit positions for analysis.

--Jon

3) Do you mean that you now always extend checks even if see < 0? What's the Elo diff with see >= 0 only?

There is no see test for extensions. However, bad checks can be pruned at low depth. This change, vs. having a SEE test on the extension, was very close to neutral (no ELO change).

For eval training (Texel method) I have also "decided to label the positions afterwards," as Joost Buijs did. I have used several methods to generate them including sampling from the search. But then I play out games from the positions using this script: https://github.com/jdart1/arasan-chess/blob/m...

I am looking at: https://github.com/nodchip/Stockfish/blob/master/src/learn/gensfen.cpp The question is - it looks like by default it occasionally inserts a random move into the played games to increase variety. But then when the game is ended, it assigns the same result to all the generated FENs fo...

NO NN or NNUE Support ?

No, not yet. If you want it, you can submit a pull request .

--Jon

>Arasan test suite is no more updated? I use it a lot. One buggy position is probably 121 I have collected some newer test positions but haven't put them into a new test suite, not yet. It is on my to-do list. Meanwhile, thanks for the correction. I will do some testing on this one but it looks like...

CECP should have died 2 decades ago I think it is unnecessarily complex. And, as noted, can be poorly implemented. But UCI has its own issues too, and can be poorly implemented also. My main issue with UCI is that it basically treats the engine as a remote callable search function. It assumes you h...

When I download the windows engine + book file, it has 0kb. It's definitely on the server and is downloadable. You might want to check your antivirus. For example, Bitdefender may block the download, not because it detects malware, but because "this file is not commonly downloaded". But if I got to...

Arasan 22.2 is available from https://www.arasanchess.org Changes in Arasan 22.2: 1) Cleanups and fixes in Makefile + CMakeLists.txt. Fix GCC version detection. Better detection of clang compiler. Support Intel oneAPI complier. 2) Bug fixes in protocol class for cases where ponder search terminates ...