Obsidian 16.14 JA - new version strong chess engine (Windows and Linux)

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Obsidian, an UCI chess engine written in c++
Rating Chess Engines Diary CEDR=3740

v.16:
This new version includes a few search patches and a new NNUE architecture, finally with layers.
I dropped support for pre-AVX2, but I might add it back if requested to.
For testers: if you tested 14.24, don't test 15.0, they are exactly the same.

Obsidian 15.0 vs 14.0 (LTC)

Elo   | 27.21 +- 4.01 (95%)
Conf  | 40.0+0.40s Threads=1 Hash=128MB
Games | N: 7012 W: 2009 L: 1461 D: 3542
Penta | [7, 576, 1796, 1116, 11]

Obsidian 16.08 vs - other engines:

RubiChess 20250606 JA19.5/37+237 Partii
Berserk 2025060615/29+129 Partii
Clover 8.1.1614.5/24+524 Partii
Fritz 2014/22+622 Partii
Fire 9.3 JA15.5/21+1021 Partii
Horsie 1.1.012/20+420 Partii
Caissa 1.22 JA11/20+220 Partii
Motor 0.9.011/20+220 Partii
Starzix 6.1 JA11/20+220 Partii
Integral 7.0.0 JA10.5/20+120 Partii
PlentyChess 6.0.0 JA10.5/20+120 Partii
Alexandria 8.0.0 JA10/20+020 Partii
BlackFish 2705257.5/15+015 Partii
Halogen 13.0.19/12+612 Partii
Stormphrax 7.0.07/12+212 Partii
Stockfish 17.16/12+012 Partii
Mayhem 8.8 JA10.5/11+1011 Partii
Pawnocchio 1.7.27.5/11+411 Partii
Stormphrax7/10+410 Partii
PlentyChess 6.0.5 JA5/10+010 Partii
Alexandria 8.0.05/10+010 Partii


Neural network
Obsidian evaluates positions with a neural network trained on Lc0 data.

Windows & Linux profiled builds - Jim Ablett compiles:


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