fischerchess

README

fischerchess - Fischer Random Chess engine

A small Go library that provides Fischer Random (Chess960) starting positions and helpers to create valid chess boards from those positions. It builds on the github.com/elaxer/standardchess and github.com/elaxer/chess packages.

Features

• Provides the full list of 960 valid starting piece placements in Variants.
• Convenience function NewBoardFilled() that returns a random Chess board arranged according to one of the 960 valid starting positions.
• Test coverage validating position symmetry, bishop coloring, and castling availability.

Quick start

Install:

go get github.com/elaxer/fischerchess

Basic usage:

package main

import (
	"fmt"
	"github.com/elaxer/fischerchess"
	"github.com/elaxer/standardchess/encoding/fen"
)

func main() {
	board := fischerchess.NewBoardFilled()
	fmt.Println(fen.Encode(board)) // example: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
}

Decode a known variant (from Variants):

import "github.com/elaxer/standardchess/encoding/fen"

board, err := fen.Decode(fischerchess.Variants[0])
if err != nil {
	panic(err)
}

API

• func NewBoardFilled() chess.Board — returns a new board with a randomly selected Fischer Random starting layout.
• var Variants []string — array containing 960 valid starting piece placement FENs (piece placement only, without side-to-move, castling, etc.).

Testing

Run tests:

go test ./...

The test suite checks that each starting variant decodes correctly, pieces are mirrored between White and Black ranks, bishops are on opposite-colored squares, and castling rights are available.

Contributing

Bug reports and contributions are welcome. Please open issues or pull requests against this repository. Keep changes small and add tests for new behavior.

License

The GNU General Public License

Documentation

Overview

Package fischerchess implements Fischer Random Chess (Chess960) specific functionality on top of the standard chess library.

Index

• Variables
• func NewBoardFilled() chess.Board

Variables

var Variants = [960]string{}/* 960 elements not displayed */

Variants contains the 960 valid starting positions for Fischer Random Chess in FEN notation (without the side to move, castling rights, en passant target square, halfmove clock, and fullmove number).

Functions

func NewBoardFilled

func NewBoardFilled() chess.Board

NewBoardFilled creates a new Fischer Random Chess board with pieces arranged according to one of the 960 valid starting positions, selected randomly using the provided rand.Rand source.