Chess engine written in C++11
Version 1.0.x
A 64-bit, mostly UCI compliant, AB minimax engine. Elo is approximately 2000 depending on the time control and various other factors. This engine is a hobby project and is being written completely from scratch.
Play it here! Lichess account needed (free).
Most things in the engine are pretty standard however a lot of implementation was done with little reference because it was a lot more fun that way. The move generation algorithm is pretty clever (incrementally updates list of moves as most legal moves stay the same after a single piece is moved) and very fast but its overall performance criticality is questionable; It will also make your eyes bleed.
The project started as more low-level C style with C++ classes thrown in but I'm currently in the process of refactoring, adding tests, and just generally messing with things.
Just cmake and build. The cmake is setup to download googletest automatically. Should work for both g++ and msvc. For example, if on linux, just run the following in the root folder:
cmake .
make
./karly64
I can share the dockerfile for full deployment of a lichess bot if anyone wants it.
After building just use ctest or manually run them (utest and movet) for a more detailed breakdown. May be slightly different depending on the build type.
There is also a perft executable (counts moves of different positions to certain depths) but I don't suggest trying to use it.
This is a command line engine and does not come with its own gui. Arena chess works quite well. There is currently no gameplay mode but using the engine in the command line can most easily be done with the following:
gostop- to add a move (or many) use something like
pos pos moves e2e4 e7e5 showpos/showmoveshelpfor a list of commands