Chess engine: Obsidian 14

Obsidian, an UCI chess engine written in c++

Rating Chess Engines Diary CEDR=3707

v.14 SE:

Obsidian comes back far stronger than ever:

this release features a few bug fixes, multithreaded TT initialization, and especially, Elo gains I wasn't sure I would've been able to delivier.

Both tests below were run at a way higher time control than is written - I won't get into the details of this here - it doesn't matter.

Obsidian 14.0 vs 13.0 (STC)

Elo   | 40.34 +- 6.59 (95%)

Conf  | 8.0+0.08s Threads=1 Hash=16MB

Games | N: 3002 W: 947 L: 600 D: 1455

Penta | [6, 227, 712, 526, 30]

Obsidian 14.0 vs 13.0 (LTC)

Elo   | 46.25 +- 6.05 (95%)

Conf  | 40.0+0.40s Threads=1 Hash=128MB

Games | N: 3000 W: 899 L: 502 D: 1599

Penta | [1, 184, 740, 567, 8]

Obsidian 13 - results:

Opponent	Score	+-	Games
PlentyChess 3.0.0	119.5/240	-1	240 Partii
Alexandria 7.0.0	58.5/109	+8	109 Partii
Chess-System-Tal-2	55.5/97	+14	97 Partii
Berserk 13	45.5/95	-4	95 Partii
Ethereal 14.25	45.5/83	+8	83 Partii
Titan 1.1.0	39.5/68	+11	68 Partii
RubiChess 20240112	34.5/65	+4	65 Partii
Uralochka 3.41a JA	38/64	+12	64 Partii
Lizard 10.5	36.5/64	+9	64 Partii
Caissa 1.19	34/63	+5	63 Partii
Caissa 1.20 JA	23.5/49	-2	49 Partii
Seer 2.8.0	30/48	+12	48 Partii
Viridithas 13.0.0	28.5/46	+11	46 Partii
Stockfish 16.1	18/44	-8	44 Partii
Clover 6.2	23/40	+6	40 Partii
JigSaw 5.9	17/38	-4	38 Partii
Motor 0.7.0	19.5/37	+2	37 Partii
Clover 7.0 JA	22.5/36	+9	36 Partii
Peacekeeper 3.01	21.5/35	+8	35 Partii
Caissa 1.20	17/32	+2	32 Partii
Lizard 10.4	19/31	+7	31 Partii
Viridithas 14.0.0	17/29	+5	29 Partii
Yuliana 5.0	11.5/28	-5	28 Partii
Stormphrax	16.5/26	+7	26 Partii
Stockfish 20240803	8/26	-10	26 Partii
Koivisto 9.2	16.5/25	+8	25 Partii
Clover 7.1 JA	14/25	+3	25 Partii
Motor 0.6.0	13.5/19	+8	19 Partii

Neural network

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

Obsidian 14 download