This repo contains source code for (Li)chess search engine bot's Discord chess engine, and (Li)quid chess engine both are part of the Lise bot code family.

Liquid chess engine tries to replicate human play, self-adjusting according to the opponent's Lichess blitz rating, named Liquid as it adapts to the opponent's rating play meaning plays strong against stronger players, weak against beginner players.

• Beast [2400+]
• Strong [1900 - 2400]
• Novice [1400 - 1900]
• Beginner [0 - 1400]

Liquid uses Stockfish's best move to come up with the right one, but according to its mode, it can self-adjust to using Stockfish or its logic.

• Stockfish [running at various depths for various modes] (The Stockfish developers (see AUTHORS file). Stockfish [Computer software]. https://github.com/official-stockfish/Stockfish)
• Negamax algorithm
• frequency-based blunder logic that plays a stockfish or the best move according to eval function and uses random frequency technique to "throw" like a human and mess up but at same time play the best move

• the amount of pieces both sides have
• both kings are attacked
• board space and center space
• look at captures
• look at which pieces are where

Liquid uses UCI protocol it supports following commands:

LISE UCI COMMANDS: 

-------------------------------------------------------
isready (check if engine is ready)
level (Change level)
position <FEN_STRING> (get Lise's best move in given FEN)
eval <FEN_STRING> (get Lise's eval in given FEN)
uci (view Lise UCI commands)
quit (Quit the engine)

git clone LiseChessEngine

cd LiseChessEngine/src/main/java/engine/UCIStarter

java -jar LISEBOT.jar 

Lise is an effortless engine that runs at low depths and performs a chess engine role in Discord, it's part of the Lichess search engine bot's repo code

• Beginner

simple negamax method to search for moves at lower depths

Please only challenge white side casual/rated

Play Lise Here

@jalpp