Luciole (UCI engine written in Lua)

[Roland Chastain]

A new version of Luciole is available.

I fixed several bugs in move generation, and made some optimizations. (Otherwise, the engine has not changed, and its playing level is still very low.)

Luciole has a new repository. (I lost access to my GitLab account, so I am moving all my projects to Codeberg.)

There is also a simple chessboard made with LÖVE.



(The pieces set above comes from the boardgame tiles by Lanea Zimmerman.)

To run the chessboard, clone the git repository, open a terminal in project directory and type:

Code: Select all

love .

See README for command-line options.

Move the pieces with the mouse. Press 'm' to make the computer move.

Luciole and the chessboard are based on the same module chess.lua, so that the chessboard can be used as a tool to test the engine.

[Roland Chastain]

Luciole 0.0.8 is available.

• Fixed a last (?) error in move generation. Now perft command gives good results for all positions.
• Added an opening book.

[Tibono]

Hi Roland,
in this short self-play game, Luciole 0.0.8 wants to play KxR (maybe a wrong castling?)
[pgn][Event "Computer chess game"]
[Site "Arena"]
[Date "2024.05.09"]
[Round "?"]
[White "Luciole 0.0.8"]
[Black "Luciole 0.0.8"]
[Result "0-1"]
[BlackElo "2000"]
[ECO "B06"]
[Opening "Modern"]
[Time "16:27:40"]
[Variation "1.e4 g6 2.Nc3 Bg7 3.f4 d6"]
[WhiteElo "2000"]
[TimeControl "40/600:40/600:40/600"]
[Termination "rules infraction"]
[PlyCount "16"]
[WhiteType "program"]
[BlackType "program"]

1. f4 g6 2. d3 Bg7 3. Nc3 Bd4 4. Nb5 Bg7 5. Nf3 d6 6. g3 e6 7. e4 Nd7 8.
Be2 b6 {Arena Adjudication. Illegal move!} 0-1
[/pgn]

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2024-05-09 16:28:07,940*1*Start calc, move no: 16
2024-05-09 16:28:07,940-->1:position startpos moves f2f4 g7g6 d2d3 f8g7 b1c3 g7d4 c3b5 d4g7 g1f3 d7d6 g2g3 e7e6 e2e4 b8d7 f1e2 b7b6
2024-05-09 16:28:07,940-->1:go wtime 598530 btime 598420 winc 0 binc 0 movestogo 32
2024-05-09 16:28:08,358<--1:bestmove e1h1
2024-05-09 16:28:08,358*moveerror*start piece<0 and target piece<0, can't capture own piece !...!
2024-05-09 16:28:08,358*1*---------> Arena:Illegal move!: "bestmove e1h1" ()

Anyway, thanks for sharing
Amicalement,
Eric

[mar]

this looks like a regular orthodox chess game?

KxR is the preferred way in FRC (UCI) - this or explicitly denote castling as O-O or O-O-O (xboard), because Kg1 can be ambiguous in some positions
that being said, Arena is very buggy when it comes to FRC castling to the point that I'd say it doesn't support Chess960 at all
like this FEN: 1r1k3K/pppppppp/8/5nn1/8/8/PPPPPPPP/8 b q - 0 1
any engine would castle long to checkmate but Arena considers it an "illegal move"

anyway - nice, any plans for a Windows version Ronald?
the pixelart piece set looks gorgeous, but I wouldn't mind bigger squares to let the pieces breathe a bit

[Roland Chastain]

in this short self-play game, Luciole 0.0.8 wants to play KxR (maybe a wrong castling?)

Hi Éric. Thank you for reporting. I can reproduce the bug. Indeed in that case the program should use the traditional notation for castling. I will take a look.

anyway - nice, any plans for a Windows version Ronald?

Hi Martin. The LÖVE chessboard already works under Windows, as far as I know.

the pixelart piece set looks gorgeous, but I wouldn't mind bigger squares to let the pieces breathe a bit

I used the squares provided with the pieces. I don't know how it will look if I try to stretch them. I will try. (By the way there are other pieces sets included. See command-line options.) But yes, now that you say it, the squares of that pieces set are a bit narrow.

[Roland Chastain]

Luciole 0.0.8.1 is available.

Uses correct notation for castling when playing traditional chess.

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$ lua luciole.lua
position startpos moves f2f4 g7g6 d2d3 f8g7 b1c3 g7d4 c3b5 d4g7 g1f3 d7d6 g2g3 e7e6 e2e4 b8d7 f1e2 b7b6
go wtime 598530 btime 598420 winc 0 binc 0 movestogo 32
bestmove e1g1

[WARN Thu May 9 19:29:03 2024] ./chess.lua:860: e1h1 -> e1g1

[ankiwi]

A new version of Luciole is available.

I fixed several bugs in move generation, and made some optimizations. (Otherwise, the engine has not changed, and its playing level is still very low.)

...

What great timing! I was testing my game engine and wanted to make a chess game. I could not for the life of me find a LUA 5.3 compatible UCI engine until I stumbled across this. I saw you had written a board with LOVE for testing and wanted to share with you mine, as well as thank you for your hard work on this over the years. Made an account and everything



If you'd like to check it out or yell at me for implementing it horribly wrong, https://github.com/lindorffs/voidgen-chess.

Again, thank you for writing this, it saved me a lot of headache getting this working.

[Roland Chastain]

I saw you had written a board with LOVE for testing and wanted to share with you mine, as well as thank you for your hard work on this over the years.

Looks nice! Unfortunately I couldn't test it, because I am on Linux and the project (or the Makefile?) is only for Windows. When I have time, I will see if I can compile it for Linux.

If ever you are interested in a stronger engine, someone has rewritten Fruit 2.1 in Lua. I retouched it to make it work as an UCI engine. (The original Lua script was an AI vs AI demo game.) I didn't test it much, but it seems to work.

Thank you for your feedback. Glad that you like my program.