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Chess engine: Obsidian 15.13

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Obsidian is a powerful chess engine, in the CEDR ranking it is second behind Stockfish - 3737!
The new version 15.12 SE will be tested by our testers today.

Obsidian, an UCI chess engine written in c++
Rating Chess Engines Diary CEDR=3737

v.15.03:
New net
Elo   | 3.58 +- 2.42 (95%)
SPRT  | 10.0+0.10s Threads=1 Hash=16MB
LLR   | 2.05 (-2.25, 2.89) [0.00, 2.00]
Games | N: 20408 W: 4967 L: 4757 D: 10684
Penta | [59, 2284, 5304, 2502, 55]

Bench 3255732


Obsidian 15.09 SE vs - other engines:
Caissa 1.21.7 JA6/12+012 Games
Sting Black Hole 1010/10+1010 Games
CorChess 202503225.5/10+110 Games
SF-PRO 19.03.20255/10+010 Games
Berserk 20250307b4.5/8+18 Games
Stockfish 174/8+08 Games
Contact 12 L4/8+08 Games
Yuliirma 5.04/8+08 Games
DarkSeid 5.63.5/8-18 Games
Stockfish 20250321 Ivec3/6+06 Games
JudaS ++ 1.023/6+06 Games
Yuliana 7.03/6+06 Games
YuliGM 193/6+06 Games
HypnoS ++ 1.023/6+06 Games
Artemis 10TR2.5/6-16 Games
Cool Iris 142.5/6-16 Games
Cadabra 2.1.0 JA4/4+44 Games
Euwe 2.1.0 JA4/4+44 Games
Prelude Fusion 2.04/4+44 Games
Starzix 6.03/4+24 Games
Horsie 1.0.6 JA3/4+24 Games



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



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