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============================== My email: jotes@go2.pl



Chess engine: Black Core 5.0 NNUE (Windows and Linux)

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BlackCore is a UCI compatible c++ chess engine written from scratch, capable of completing high performance tasks. Rating CEDR=3114  Author: Szil Balazs

During the development of v5.0 the previous NNUE trainer was rewritten in plain c++ to support multi-threading which should significantly cut down the training time (1 week->1-3 days) as I don't have any GPU resources. This allows me to experiment with different ideas and hopefully make a new net, that actually gains elo.

A critical bug in the repetition detection was fixed and many aspects of the search and the transposition table were improved. Huge portion of the codebase was documented and cleaned up.
The new version also supports the Syzygy tablebase using Fathom.

Estimated elo on 1 thread: 3150-3250
Estimated elo on 4 threads: 3200-3300

Feel free to contact me with any questions or problems regarding BlackCore. For choosing a binary please see the installation section in the readme.

v.5.0:
Changelog
Syzygy support
More UCI support
Time management changes
Randomize draw values
IID changes
Razoring in PV nodes
Tuned parameters
RFP only in non PV nodes (by Disservin)
LMR formula change
Prevent TT cutoff after a null move
TT always replace
16 byte TT entries
Cleaned up code
Added logo by Graham
Capped HH score
Fixed rare crash
Fixed stack move
Fixed repetition detection

github:https://github.com/SzilBalazs/BlackCore/releases/tag/4.0

Individual statistics: BlackCore 2.0 - 95 games  (+ 48,= 13,- 34), 57.4 %
Baron 3.44.1                  :   1 (+  1,=  0,-  0), 100.0 %
Dimitri 5.2.3                 :   1 (+  1,=  0,-  0), 100.0 %
Asymptote 0.8                 :   1 (+  1,=  0,-  0), 100.0 %
Stockfish 15                  :   1 (+  0,=  0,-  1),  0.0 %
Devel 4.0.2.3                 :   1 (+  1,=  0,-  0), 100.0 %
Barbarossa 0.6.0              :   1 (+  1,=  0,-  0), 100.0 %
Supernova 2.4                 :   1 (+  1,=  0,-  0), 100.0 %
Zevra 2.5                     :   1 (+  0,=  1,-  0), 50.0 %
Loki 3.5.0                    :   1 (+  1,=  0,-  0), 100.0 %
MagiC 2                       :   1 (+  1,=  0,-  0), 100.0 %
Cosette 5.1                   :   1 (+  1,=  0,-  0), 100.0 %
FrankyGo 1.0.3                :   1 (+  1,=  0,-  0), 100.0 %
Pawn 2021-09-22               :   1 (+  1,=  0,-  0), 100.0 %
Vafra 3.3.2                   :   1 (+  0,=  0,-  1),  0.0 %
Deep Shredder 13              :   2 (+  0,=  0,-  2),  0.0 %
Journeyman 2.1                :   1 (+  1,=  0,-  0), 100.0 %
Fisherov chess monk 1.2       :   3 (+  0,=  0,-  3),  0.0 %
Anka 0.6.3                    :   1 (+  1,=  0,-  0), 100.0 %
Popochin 4.3                  :   1 (+  1,=  0,-  0), 100.0 %
Sapeli 2.0                    :   1 (+  1,=  0,-  0), 100.0 %
FoxSEE 8.2                    :   1 (+  1,=  0,-  0), 100.0 %
Blunder 8.5.5                 :   1 (+  1,=  0,-  0), 100.0 %
Ceibo 0.9                     :   1 (+  0,=  0,-  1),  0.0 %
Dumb 1.11                     :   1 (+  0,=  1,-  0), 50.0 %
Avalanche 1.2.0               :   1 (+  0,=  1,-  0), 50.0 %
Fornax 3.0                    :   1 (+  1,=  0,-  0), 100.0 %
RukChess 3.0 2022-09-05       :   1 (+  0,=  1,-  0), 50.0 %
Seawall 20220918              :   1 (+  1,=  0,-  0), 100.0 %
Marvin 6.1.0                  :   2 (+  0,=  1,-  1), 25.0 %
Alexandria 3.0                :   1 (+  0,=  1,-  0), 50.0 %
Caissa 1.1                    :   2 (+  0,=  1,-  1), 25.0 %
Fire NN 1072022               :   2 (+  0,=  1,-  1), 25.0 %
Lynx 0.12.0                   :   2 (+  2,=  0,-  0), 100.0 %
Trinket 3.0.0                 :   3 (+  3,=  0,-  0), 100.0 %
CorChess 101022               :   1 (+  0,=  0,-  1),  0.0 %
Solista Attack 2              :   1 (+  0,=  0,-  1),  0.0 %
Fatalii 0.3.1                 :   2 (+  2,=  0,-  0), 100.0 %
Francesca 0.32                :   2 (+  0,=  1,-  1), 25.0 %
Halogen 11                    :   1 (+  0,=  0,-  1),  0.0 %
BrainLearn 19                 :   1 (+  0,=  0,-  1),  0.0 %
Eman 8.40                     :   3 (+  0,=  0,-  3),  0.0 %
Smallbrain 6.0                :   2 (+  0,=  1,-  1), 25.0 %
AI 27.0                       :   3 (+  0,=  0,-  3),  0.0 %
RapChess 2022-10-17           :   6 (+  6,=  0,-  0), 100.0 %
Viridithas 3.0.0              :   4 (+  2,=  1,-  1), 62.5 %
Vafra 12.2 Cfish              :   3 (+  0,=  0,-  3),  0.0 %
ShashChess 25.1               :   3 (+  0,=  1,-  2), 16.7 %
YuliGM PrO 4.0                :   3 (+  0,=  0,-  3),  0.0 %
Altair 1.0.0                  :   3 (+  3,=  0,-  0), 100.0 %
Prophet 4.3                   :   3 (+  2,=  1,-  0), 83.3 %
QuintBot 1.0.0                :   3 (+  3,=  0,-  0), 100.0 %
Jackychess 0.13.1             :   2 (+  2,=  0,-  0), 100.0 %
Seer 2.6.0                    :   2 (+  0,=  0,-  2),  0.0 %
Eggnog 5.0                    :   4 (+  4,=  0,-  0), 100.0 %

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