Integral is a UCI-compliant chess engine developed in C++. It is a personal project developed with the goal of meshing my admiration for chess with programming.

Play against Integral on Lichess

Integral supports the following UCI commands (not all listed):

• uci Prints information about Integral and replies with uciok
• ucinewgame Sets up a new game and clears the transposition table
• isready Replies with readyok
• position startpos Sets the board state and pieces to the starting position
• position fen <string> Sets the board state and pieces to the given FEN string
• position fen <string> moves <e2e4 e7e5 ...> Plays the given moves from the FEN position
• go depth <depth> Searches up to the given depth and replies with bestmove <move>
• go infinite Searches up to the maximum search depth (100) and replies with bestmove <move>
• go wtime <time> btime <time> winc <inc> binc <inc> Searches for and replies with the best move given within the time/increment allotted. The amount of time used is managed by an internal time management system to ensure the engine doesn't run out of time
• go movetime <time> Searches for the best move using the full time allotted
• go [infinite] Searches for an infinite amount of time
• go perft <depth> Runs a split perft test on the current position up the specified depth

Integral also supports some non-standard commands:

• test [see|perft] Runs tests on static exchange evaluation (SEE) and/or move generation (perft)
• bench [depth] Performs a search on the current position up to the specified depth and returns the node count

Integral provides a Makefile for compatibility with CMake and ease of use.
To compile Integral, enter the following commands in a terminal:

git clone https://github.com/aronpetko/integral
cd integral
make <native|x86_64_bmi2|x86_64_modern|x86_64>

Integral is estimated to be around 3400 CCRL Blitz, which puts it at a super-human level.