DoctorB

DoctorB is a UCI compatible chess engine, written in C++.

DoctorB is named after a character in Schachnovelle by Stefan Zweig. Dr B plays chess against himself by seperating his mind in two personas: Black and White.

Current features

• Classical bitboard board representation and move generation
• Alpha beta search strategy with iterative deepening
• Tapered piece square board evaluation
• Hashing / transposition table
• Move ordering
• Static Exchange Evaluation (SEE)
• Repetition detection
• Support Polyglot opening books

Next up

• Quiesence search
• Aspiration Windows

Down the road

• End game tables
• Multi-threaded search
• ...

Additional commands

Next to the traditional UCI commands, DoctorB also supports the following commands

• go perft [n] : show the number of possible positions after [n] plies
• d : display the current position

Options

• option name Hash type spin default 32 min 1 max 128 (Hash size in MB)
• option name OwnBook type check default false (use Polyglot opening book)
• option name OwnBookPath type string default openings.bin (Polyglot opening book path)

Acknowledgements

I'm trying to keep things originial. However, this engine would not have been possible without the following sources:

• https://www.chessprogramming.org/Main_Page
• https://www.arasanchess.org/programr.shtml
• https://github.com/AndyGrant/Ethereal
• https://github.com/jdart1/arasan-chess
• http://wbec-ridderkerk.nl/html/UCIProtocol.html
• http://hgm.nubati.net/book_format.html