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I am also going to suggest replacements for numbers 65 and 71: 8/8/Q4p1k/6p1/4pNqn/PP2P1P1/3r1P2/2R3K1 b - - bm gxf4; id "arasan20.65"; c0 "Arasan-Wasp, FICS 2020 (analysis)"; 5k2/2N2p2/1p1p1nr1/p2P4/P1P3Pb/1P2Q3/1q6/3B1RK1 b - - bm b5; id "arasan20.71"; c0 "Ethereal 11.0-Stockfish 9, Andreas St\ ra...

I would like to suggest the following replacements for the problematic positions. These are from a list of candidate test positions I have been collecting. None are super-hard but difficult enough to be interesting IMO. r2r1k2/p3qpp1/1p1ppn1p/n5B1/P1PNbP2/2P3Q1/4B1PP/4RRK1 w - - bm Bg4; id "arasan 2...

Texel tuning is basically supervised learning using logistic regression. There is a very large literature on this, outside of the field of chess.

For just one example: https://web.stanford.edu/~jurafsky/slp3/5.pdf

Another couple positions that were mentioned: r1q1k2r/1p1nbpp1/2p2np1/p1Pp4/3Pp3/P1N1P1P1/1P1B1P1P/R2QRBK1 b kq - bm Bxc5; id "arasan20.3"; c0 "Mapanare-XXAAXX, Tues 23 Feb Rapid Engine Tour, Infinity Chess 2016"; depth 50 seldepth 13 multipv 1 score +213 nodes 32640209729 nps 18133439 hashfull 1000...

Erroneous positions I found : Multi-PV analysis of these with Stockfish-12, dual Xeon e5-2690v3 (16 cores, 16G hash), 1/2 hour per position: engine ready 5rk1/8/pqPp1r1p/1p1Pp1bR/4B3/5PP1/PP2Q1K1/R7 w - - bm Rxg5+; id "arasan20.61"; c0 "sedarpi-noamgmi, www.chesspresso.net 2014"; depth 48 seldepth ...

Gradient descent can be run on parallel threads if you are using an algorithm like ADAM. Does not readily work with "mini-batches," though.

--Jon

Around +100 Elo points compared to Arasan 22.1 x64

I don't think so, not in my testing. Arasan has a pretty good book, though. That might have influenced your test.

It's unfortunate, but there are a lot of garbage games out there. At the least, people have mangled and abused the Event and Site fields, if not corrupted the actual game. Then the bad games are copied and pasted into other databases and the rot spreads. ChessBase is pretty good about cleaning up wh...

Arasan used YBW before version 21.0. I don't think Crafty uses DTS - I think that was a Cray Blitz thing - but the last few versions do have some interesting mods to multithreading.

--Jon

That's even worse, as it becomes a competition of which opening book is better rather than which engine is better. SSDF actually does test with opening books enabled, if the engine has one. They always have. I think that goes back to the days when the top engines were pretty much all commercial and...