Class Position

This class represents a position in standard chess

Inheritance

System.Object

Position

Implements

System.ICloneable

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: PonzianiComponents.Chesslib

Assembly: PonzianiComponents.dll

Syntax

public class Position : ICloneable

Constructors

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Position()

Create the start position

Declaration

public Position()

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Position(String)

Create a position from a FEN string

Declaration

public Position(string fen)

Parameters

Type	Name	Description
System.String	fen	The position specified in FEN notation

Properties

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Chess960

Position is a Chess960 position

Declaration

public bool Chess960 { get; }

Property Value

Type	Description
System.Boolean

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DrawPlyCount

The number of plies since the last pawn push or capture

Declaration

public int DrawPlyCount { get; }

Property Value

Type	Description
System.Int32

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EPD

The EPD representation of the position (FEN without move number and h50 move counter

Declaration

public string EPD { get; }

Property Value

Type	Description
System.String

Remarks

The En-passant square is only provided if there is a capture possible

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EPSquare

The En-Passant Square (the to-square of an en passant capture). This square is only set, if an enpassant capture is possible (not after any pawn double move as in FEN standard)

Declaration

public Square EPSquare { get; }

Property Value

Type	Description
Square

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FEN

The FEN representation of the position In case of Chess960 X-Fen representation is used

Declaration

public string FEN { get; }

Property Value

Type	Description
System.String

Remarks

The En-passant square is only provided if there is a capture possible

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IsCheck

Returns true is side to move is in check

Declaration

public bool IsCheck { get; }

Property Value

Type	Description
System.Boolean

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IsDoubleCheck

Returns true if side to move is double-checked

Declaration

public bool IsDoubleCheck { get; }

Property Value

Type	Description
System.Boolean

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IsMate

Returns true if position is a mate

Declaration

public bool IsMate { get; }

Property Value

Type	Description
System.Boolean

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IsStalemate

Returns true if position is stalemate

Declaration

public bool IsStalemate { get; }

Property Value

Type	Description
System.Boolean

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MoveNumber

The move number of the current position

Declaration

public int MoveNumber { get; }

Property Value

Type	Description
System.Int32

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PolyglotKey

Hash Key of current position used to find position in Polyglot opening books

Declaration

public ulong PolyglotKey { get; }

Property Value

Type	Description
System.UInt64

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SFEN

The Shredder-FEN representation of the position (only relevant for Chess960)

Declaration

public string SFEN { get; }

Property Value

Type	Description
System.String

Remarks

The En-passant square is only provided if there is a capture possible

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SideToMove

The side which has to make the next move

Declaration

public Side SideToMove { get; }

Property Value

Type	Description
Side

Methods

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ApplyMove(Move)

Applies a move to the position

Declaration

public void ApplyMove(Move move)

Parameters

Type	Name	Description
Move	move	The move to be applied

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ApplyMove(String)

Applies a move to the position

Declaration

public void ApplyMove(string moveInUCINotation)

Parameters

Type	Name	Description
System.String	moveInUCINotation	The move to be applied in UCI notation

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ASCII()

ASCII rendering of position. Allows to printout a position diagram in console applications

Declaration

public string ASCII()

Returns

Type	Description
System.String	ASCII based position diagramm

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AsHTML()

HTML rendering of position. Useful for debugging within Visual Studio

Declaration

public string AsHTML()

Returns

Type	Description
System.String	An HTML string showing the position diagram

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CastlingAllowed(CastleFlag)

Returns true if the provided Castling option is allowed

Declaration

public bool CastlingAllowed(CastleFlag flag)

Parameters

Type	Name	Description
CastleFlag	flag

Returns

Type	Description
System.Boolean

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CheckLegal(out String)

Checks if a position is legal and consistent

Declaration

public bool CheckLegal(out string message)

Parameters

Type	Name	Description
System.String	message	out parameter providing information about cause of illegality

Returns

Type	Description
System.Boolean	true, if position is legal, false otherwise

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Clone()

Declaration

public object Clone()

Returns

Type	Description
System.Object

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Divide(Int32)

Returns the Divide value (a variation of perft, listing all moves and for each move, the perft of the decremented depth)

Declaration

public Dictionary<Move, long> Divide(int depth)

Parameters

Type	Name	Description
System.Int32	depth	The depth for which the divide command shall be executed

Returns

Type	Description
System.Collections.Generic.Dictionary<Move, System.Int64>	A Dictionary which contains for any legal move in the positions a perft result

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FixCastlingFlags()

Declaration

public void FixCastlingFlags()

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GetMoves()

Generates a list of all legal Moves

Declaration

public List<Move> GetMoves()

Returns

Type	Description
System.Collections.Generic.List<Move>	List of all legal moves

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GetPhase()

Calculates the game phase starting by 0 at startposition and ending at 256 (Pawn ending)

Declaration

public int GetPhase()

Returns

Type	Description
System.Int32	The game phase

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GetPiece(Square)

Get's the piece for a given square

Declaration

public Piece GetPiece(Square square)

Parameters

Type	Name	Description
Square	square	A square

Returns

Type	Description
Piece	The piece on the square

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GetPieceSquareList()

Calculates a list of squares for each piece

Declaration

public Dictionary<Piece, List<Square>> GetPieceSquareList()

Returns

Type	Description
System.Collections.Generic.Dictionary<Piece, System.Collections.Generic.List<Square>>	Dictionary with list of Square for each Piece

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IsDrawnByInsufficientMatingMaterial()

Checks if position is drawn due to lack of sufficient mating material

Declaration

public bool IsDrawnByInsufficientMatingMaterial()

Returns

Type	Description
System.Boolean	true, if position is drawn

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Perft(Int32, Boolean)

Calculates the perft value of the current position See https://chessprogramming.wikispaces.com/Perft

Declaration

public long Perft(int depth, bool divide = false)

Parameters

Type	Name	Description
System.Int32	depth	The depth for which perft should be calculated
System.Boolean	divide	If true, the subresults for each move on the initial depth will be printed to console https://www.chessprogramming.org/Perft

Returns

Type	Description
System.Int64	The perft result

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ToSAN(Move)

Creates the SAN (Standard Algebraic Notation) encoding of a move

Declaration

public string ToSAN(Move move)

Parameters

Type	Name	Description
Move	move	The move to be encoded

Returns

Type	Description
System.String	The SAN encoded move

Implements

System.ICloneable