chess-polyglot

chess-polyglot is a node module to grab moves from Polyglot-formatted opening-book bin files. Polyglot book format

A lot of this code has been copied from the polyglot-chess node module then updated to work with current versions of Node.js via the node-addon-api.

Installation

$ npm install chess-polyglot

Example

const Polyglot = require('chess-polyglot')

const poly = new Polyglot()

const fen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
console.log("Polyglot hash for fen " + fen + " is: " + poly.hash(fen))
console.log("Best move in the book is: " + poly.find(fen, "book.bin", true))
console.log("Random move in the book is: " + poly.find(fen, "book.bin", false))

API

Functions

chess-polyglot exposes following functions -

find(fen, bookFile, findBest)

find takes a fen string and a book file path and looks up the hash in the book file. If findBest is true it returns the best move according to the weight otherwise it returns a random move with the given hash. The chance of a random move being returned is in proportion to its weight. If no move is found it returns an empty string.

hash(fen)

hash takes a fen string and returns its polyglot hash.

Linting

To lint the js files with jshint run the command:

$ grunt jshint

Credits

Adapted from polyglot-chess, which is derivative of the excellent stockfish polyglot book source code.

License

chess-polyglot is released under the MIT License. See the bundled LICENSE file for details.