Clover is a chess engine, written in C++, inspired by my favorite plant. Since the 2020 lockdown, I got bored and decided to combine the 2 things I love the most: chess and programing, into making a program that can beat me.

Currently, Clover supports Endgame Tablebases, thanks to Fathom.

Clover is UCI compatible, but doesn't have a GUI, so, in order to play with it, you need a GUI like Arena, Cute chess etc.

If you want to compile locally, I recommend you to use:

g++ *.cpp *.c -march=native -Wall -O3 -o output.exe -std=c++11

without -flto, because it crashes for some strange reason.

If you are compiling on Linux, you need to add -pthread to your command line.

In the future, I will add a makefile too.

These are the versions sorted by speed, the ones at the top being the fastest:

• -bmi2, supported on any bmi2 CPU
• -popcnt, supported by most non-ancient CPUs
• normal version, no aditional compile flags

Setting thread count, Syzygy Path and Hash size is now available.

Additional UCI commands:

• Perft command (after setting position)

perft <depth>

• Eval command (after setting position)

eval

• Tune command

tune

If one spots a bug or finds an improvement, I'm open to any suggestion.

I inspired myself from:

• Stockfish
• Ethereal
• Igel
• Topple
• and of course ChessProgrammingWiki