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/notnil/chess"
    "github.com/notnil/chess/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())
}