Chess Kit (F#)

Disclaimers

1. API is very unstable at the moment! Wait for the version 1.0 before you depend on the library
2. Zobrist is not in the code yet. I'm playing with the API at the moment.

What it is

Chess Kit includes:

• Immutable Board representation
• Parsing moves in algebraic notation (SAN)
• Detect position properties: check, mate, stalemate, draw by repetition, 50 moves rule, insufficient material.

// Fool's Mate
var position = Board.StartingPosition
    .MakeMove("f3")
    .MakeMove("e5")
    .MakeMove("g4")
    .MakeMove("Qh4#");
Console.WriteLine(position.Dump());
Console.WriteLine(position.Properties);

prints out:
 ╔═══╤═══╤═══╤═══╤═══╤═══╤═══╤═══╗
8║ r │ n │ b │   │ k │ b │ n │ r ║
 ╟───┼───┼───┼───┼───┼───┼───┼───╢
7║ p │ p │ p │ p │   │ p │ p │ p ║
 ╟───┼───┼───┼───┼───┼───┼───┼───╢
6║   │   │   │   │   │   │   │   ║
 ╟───┼───┼───┼───┼───┼───┼───┼───╢
5║   │   │   │   │ p │   │   │   ║
 ╟───┼───┼───┼───┼───┼───┼───┼───╢
4║   │   │   │   │   │   │ P │ q ║
 ╟───┼───┼───┼───┼───┼───┼───┼───╢
3║   │   │   │   │   │ P │   │   ║
 ╟───┼───┼───┼───┼───┼───┼───┼───╢
2║ P │ P │ P │ P │ P │   │   │ P ║
 ╟───┼───┼───┼───┼───┼───┼───┼───╢
1║ R │ N │ B │ Q │ K │ B │ N │ R ║
 ╚═══╧═══╧═══╧═══╧═══╧═══╧═══╧═══╝
   A   B   C   D   E   F   G   H

Mate

• Parse FEN
• Parse moves in coordinate notation
• Print FEN

var move = Move.Parse("b7-b8=Q");
var legalMove = Fen
    .Parse("8/1P6/8/8/8/8/8/8 w - - 0 1")
    .ValidateLegalMove(move);
var nextPosition = legalMove.ToPosition();
Console.WriteLine(Fen.Print(nextPosition));

prints out:
1Q6/8/8/8/8/8/8/8 b - - 0 1

• Apply the moves to the board and not only get a new board, but also all possible info about that move, like why it is illegal
• Get all legal moves for a piece. This is not based on trying to apply moves from all squares to all squaresn, but a dedicated algorithm
• Print the board nicely as text ;)

What it is not

• it is not a chess engine
• it's not nearly optimal enough to enable you to write a chess engine on top of it
• it is not chess games database

What it might also be

Versions after 1 can include:

• Zobrist hash key for a position
• [PGN] (http://en.wikipedia.org/wiki/Portable_Game_Notation) load\save
• [UCI] (http://en.wikipedia.org/wiki/UniversalMove.Parsehess_Interface) interfaces
• Chess game commenting facilities

Known issues

• you have to set up in your app.config manually