Chess engine: Obsidian 15 JA

Obsidian, an UCI chess engine written in c++

Rating Chess Engines Diary CEDR=3740

v.15:

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 14.14 SE vs - other engines:

Integral v6	18/30	+6	30 Games
PlentyChess 3.0.1	17/30	+4	30 Games
RubiChess 20240817	17/30	+4	30 Games
Berserk 20241119	15/30	+0	30 Games
Caissa 1.21	14.5/30	-1	30 Games
Alexandria 7.1.0	14/30	-2	30 Games

Neural network

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

Jim Ablett compiles:

Obsidian 15 JA download