opening

README

opening

opening provides interactivity to opening books such as Encyclopaedia of Chess Openings (ECO) which is loadable from the package. Source: https://github.com/lichess-org/chess-openings

Visual

Advance Variation subtree of the French Defense:

Example

package main

import (
    "fmt"

    "github.com/grasparv/chess/v2"
    "github.com/grasparv/chess/v2/opening"
)

func main(){
    g := chess.NewGame()
	g.MoveStr("e4")
	g.MoveStr("e6")

	// print French Defense
	book := opening.NewBookECO()
	o := book.Find(g.Moves())
	fmt.Println(o.Title())
}

Documentation

Overview

Package opening implements chess opening determination and exploration.

Index

• type Book
• type BookECO
  • func NewBookECO() *BookECO
  • func (b *BookECO) Find(moves []*chess.Move) *Opening
  • func (b *BookECO) Possible(moves []*chess.Move) []*Opening
• type Opening
  • func (o *Opening) Code() string
  • func (o *Opening) Game() *chess.Game
  • func (o *Opening) PGN() string
  • func (o *Opening) Title() string

Types

type Book

type Book interface {
	// Find returns the most specific opening for the list of moves.  If no opening is found, Find returns nil.
	Find(moves []*chess.Move) *Opening
	// Possible returns the possible openings after the moves given.  If moves is empty or nil all openings are returned.
	Possible(moves []*chess.Move) []*Opening
}

Book is an opening book that returns openings for move sequences

type BookECO

type BookECO struct {
	// contains filtered or unexported fields
}

BookECO represents the Encyclopedia of Chess Openings https://en.wikipedia.org/wiki/Encyclopaedia_of_Chess_Openings BookECO is safe for concurrent use.

func NewBookECO

func NewBookECO() *BookECO

NewBookECO returns a new BookECO. This operation has to parse 2k rows of CSV data and insert it into a graph so it can take some time.

func (*BookECO) Find

func (b *BookECO) Find(moves []*chess.Move) *Opening

Find implements the Book interface

func (*BookECO) Possible

func (b *BookECO) Possible(moves []*chess.Move) []*Opening

Possible implements the Book interface

type Opening

type Opening struct {
	// contains filtered or unexported fields
}

A Opening represents a specific sequence of moves from the staring position.

func (*Opening) Code

func (o *Opening) Code() string

Code returns the Encyclopaedia of Chess Openings (ECO) code.

func (*Opening) Game

func (o *Opening) Game() *chess.Game

Game returns the opening as a game.

func (*Opening) PGN

func (o *Opening) PGN() string

PGN returns the opening in PGN format.

func (*Opening) Title

func (o *Opening) Title() string

Title returns the Encyclopaedia of Chess Openings (ECO) title of the opening.