fen

Documentation

Overview

Package fen implements encoding and decoding of Forsyth-Edwards Notation (FEN) as defined in "Standard: Portable Game Notation Specification and Implementation Guide", revision 1994.03.12.

Notably, this package is compliant with §16.1.3.4 and will encode an en passant target square "if and only if the last move was a pawn advance of two squares [...] even if there is no pawn of the opposing side that may immediately execute the en passant capture".

Index

• Constants
• func Decode(s string) (core.Position, error)
• func Encode(p core.Position) string
• func MustDecode(s string) core.Position

Constants

const Starting = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"

Starting is the FEN string for the starting position.

Functions

func Decode

func Decode(s string) (core.Position, error)

Decode decodes a FEN string and returns the position it represents.

func Encode

func Encode(p core.Position) string

Encode encodes a position as a FEN string.

func MustDecode

func MustDecode(s string) core.Position

MustDecode is like Decode but panics if the FEN is invalid.