maksimkorzh/bbc

Bit Board Chess (BBC) - The easiest to understand bitboard chess engine by Code Monkey King

BBC (Bit Board Chess) + Stockfish NNUE!

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

Subscribers' projects based on BBC

KhepriChess by Kurt1288: https://github.com/kurt1288/KhepriChess (TypeScript)
KittyEngine by UnboxTheCat: https://github.com/evanhyd/KittyEngineV4 (C++)

Project sponsors

• Eduardo Cáceres

Play BBC online

Final release

YouTube tutorials

Final version CCRL rating is 2937 ELO

• BBC 1.4 + SF NNUE FINAL VERSION 2937 Elo
• BBC 1.3 + SF NNUE (2700+ Elo)
• BBC 1.2 1993 ELO
• BBC 1.1 2096 ELO
• BBC 1.0 1957 ELO

Features

• own online GUI
• 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
without the help of Talk Chess forum
community members who has been helping me
during the development process significantly
I would like to thank to:

• 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
  
• 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

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

Test matches

Get PGN games

Support the project

Become a Patron!