Bluebetafish (Chess engine in C++)

Overview

• Bluebetafish is a UCI chess engine in C++.
• It is a console app which can give best move for a given chess position by searching upto specific depth or by searching for specific amount of time.
• You can use this CLI program using UCI commands, or you can play against it using any UCI protocol supported chess GUI.
• Approximate Elo : 1600

Tutorial

• You can download the executable from bin directory, or you can compile the source code using make command.
• You can use the CLI program using UCI commands.
• You can also play against the engine using any UCI protocol supported GUI. Arena is a free chess GUI, which you can download from here : http://www.playwitharena.de/
• 

Supported UCI commands

• GUI to Engine

  • position [fen | startpos ] moves ....

    • Sets up the position described in fenstring on the internal board and plays the moves on the internal chess board.
    • Pass startpos as argument if you want to initialize the board to starting position.
    • moves is optional argument. If it is not passed, no moves are played after the given fen/startpos.
    • Example:

      • Run the command position startpos :

        

      • Run the commande position fen "FEN_STRING"

        

      • Run the command position startpos moves e2e4 e7e5 g2g3

        

  • go

    • Start calculating on the current position set up with the "position" command.
    • There are a number of commands that can follow this command, all will be sent in the same string. If one command is not send its value should be interpreted as it would not influence the search.
    • depth "DEPTH_VALUE"
      • Searches the position upto depth = "DEPTH_VALUE"
      • Example : Run the command go depth 6
    • movetime "MOVETIME_VALUE"
      • Searches the position for "MOVE_TIME" milliseconds
      • Example : Run the command go movetime 5000 (Searches for 5 seconds)
    • wtime "WTIME_VALUE" : Searches the position assuming white has "WTIME_VALUE" milliseconds remaining
    • btime "BTIME_VALUE" : Searches the position assuming black has "BTIME_VALUE" milliseconds remaining
      • Example : Run the command go wtime 180000 (Searches the position assuming white has 180 seconds)
    • winc : white increment per move in milliseconds
    • binc : black increment per move in milliseconds
    • movestogo "MOVESTOGO" : time increment begins after "MOVESTOGO" moves

  • stop

    • Use this command to stop the engine while it is calculating.
    • Example: (the engine stops while calculating for depth=9)
      

  • quit

    • The program quits.

• Engine to GUI

  • bestmove "MOVE"

    • The engine has stopped searching and found the best move for the current position.

  • info

    • The engine wants to send infos to the GUI.
    • The engine can send only selected infos and multiple infos can be send with one info command.
    • depth : current depth upto which search has been done.
    • time : time searched in millisecond.
    • nodes : number of nodes searched
    • pv "MOVE1" "MOVE2" "MOVE3" ..... : the principal variation line(best move sequence for both players) found.
    • score cp "SCORE" : the score(evaluation) in centi-pawn unit from engine's POV.