BBC (Bit Board Chess) + Stockfish NNUE!

• UCI chess engine by Code Monkey King<br>
• written for didactic purposes<br>
• covered in 95 YouTube video series

Subscribers' projects based on BBC

KhepriChess by Kurt1288: https://github.com/kurt1288/KhepriChess (TypeScript)<br> KittyEngine by UnboxTheCat: https://github.com/evanhyd/KittyEngineV4 (C++)<br> Soomi by Otto Laukkanen: https://github.com/Koma1867/Soomi-V1-Chess-engine-in-golang (Golang)<br> Chal by Naman Thanki: https://github.com/namanthanki/chal

Project sponsors

• Eduardo Cáceres

Play BBC online

Final release

YouTube tutorials

Final version CCRL rating is <a href="https://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?match_length=30&each_game=1&print=Details&each_game=1&eng=BBC%201.4%20Stockfish%20NNUE%2064-bit#BBC_1_4_Stockfish_NNUE_64-bit">2937 ELO</a>

• BBC 1.4 + SF NNUE FINAL VERSION <a href="https://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?match_length=30&each_game=1&print=Details&each_game=1&eng=BBC%201.4%20Stockfish%20NNUE%2064-bit#BBC_1_4_Stockfish_NNUE_64-bit">2937 Elo</a>
• BBC 1.3 + SF NNUE (<a href="http://talkchess.com/forum3/viewtopic.php?f=6&t=75536">2700+ Elo</a>)
• BBC 1.2 <a href="https://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?match_length=30&each_game=1&print=Details&each_game=1&eng=BBC%201.2%2064-bit#BBC_1_2_64-bit">1993 ELO</a>
• BBC 1.1 <a href="https://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?print=Details&each_game=1&eng=BBC%201.1%2064-bit#BBC_1_1_64-bit">2096 ELO</a>
• BBC 1.0 <a href="https://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?print=Details&each_game=1&eng=BBC%201.0%2064-bit#BBC_1_0_64-bit">1957 ELO </a>

Features

• own online <a href="https://github.com/maksimKorzh/uci-gui">GUI</a>
• bitboard board representation
• pre-calculated attack tables
• magic bitboards for sliding pieces
• encoding moves as integers
• copy/make approach for making moves
• negamax search with alpha beta pruning
• PV/killer/history move ordering
• iterative deepening
• PVS (Principle Variation Search)
• LMR (Late Move Reduction)
• NMP (Null Move Pruning)
• razoring
• evaluation pruning / static null move pruning
• Transposition table (up to 128MB)
• PURE Stockfish NNUE evaluation + 50 move rule penalty
• UCI protocol

Credits

This project would never be completed<br> without the help of Talk Chess forum<br> community members who has been helping me<br> during the development process significantly<br> I would like to thank to:<br> <br>

• HaraldLuessen & Pedro Castro Elgarresta for neverending hints and technical support
• Sven Schüle for explaining how mating scores works in TT (in great details!)
• Jay Warendorff for testing development versions of BBC<br>
• Marcel Vanthoor for teaching me linear algebra and general inspirations
• Ronald Friederich for providing PeSTO evaluation tables and sharing his ideas
• Gabor Szots from CCRL for testing & rating BBC
• Silvian R. for running private tests
• Chris Rea for testing and fixing bugs
• Brendan J. Norman for creating logo for BBC
• Daniel Shawul for providing NNUE probe library <br>

And all the subscribers watching my videos and<br> motivating me to keep the development!<br>

Test matches

<a href="https://github.com/maksimKorzh/bbc/tree/master/pgn">Get PGN games</a>

Support the project

<a href="https://www.patreon.com/code_monkey_king">Become a Patron!</a>