MeanChess

Discrete, dishonourable, and semi-automatic Lichess cheat engine. Especially optimized for blitz and bullet games.

Install

• The code in meanChess.js is a Tampermonkey userscript.
• chess_server.py is a Flask server using python-chess for chess programming utilities. Run it using python chess_server.py. Before doing so, run pip install -r requirements.txt. Change PATH_TO_STOCKFISH to your local Stockfish engine.

Usage

The control panel will present itself at the bottom of the page during a Lichess game. Follow the instructions given. MeanChess supports "Discrete mode" in which the player is given two arrows. The green arrow will always represent the best move given a position whilst the blue arrow is a good move at best, and a mistake at worst. If the player wishes to only get the best move once, they may press the "Get move" button.

MeanChess does not work when playing anonymously.

Bugs

1. May stop working when making many premoves in succession. Solution: Press "Stop" followed by "Start Cheat". Alternatively, get gud.
2. Arrows may not have arrowheads. Solution: Draw an arrow.
3. The first suggestion might show best move for opponent. This only happens once.

The mentioned bugs occur in Chrome, and I have yet to see 1 and 2 in Firefox and Firefox forks.

Depth recommendation

Based on time vs. best move trade-offs.

Gamemode	Depth
Bullet	0.1 s
Blitz	1 s
$\geq$ Rapid	+3 s

Demo

mean-chess-demo.webm