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    1.1.0 • Public • Published


    Event-Based chess Algorithm for NodeJS


    npm i chess-node



    import * as chess from 'chess-node'


    Only import the Game Class

    import Game from 'chess-node'

    JavaScript w/ CommonJs

    const chess = require('chess-node')


    Only import the Game Class

    const Game = require('chess-node').default

    Buckle Up. Things are gonna get complex.

    Creating an Instance

    The default export or the Game Class takes in 5 arguements while consturcting. 3 of them are optional. Let's go through all of them.

    • EventEmitter
    • gameEventString
    • white
    • black
    • board

    1. EventEmitter

    It's an instance of the EventEmitter class from the events module of NodeJS

    Note: You should provide a fresh instance of the EventEmitter class

    2. gameEventString

    A unique string with which the Game class can listen to events emmited. We'll come back to this later

    3, 4. White, Black

    3rd and 4th Param is an instance of the Player Class. You can ignore these as the Game Class will create them for you.

    5. Board

    The Board class. You can Ignore this as well. Basically it's the chess board for the Game.

    Construction Example:

    import { EventEmitter } from 'events'
    import Game from 'chess-node'
    const game = new Game(new EventEmitter(), 'chess-game-1')

    Fun Fact: Every Export is a Class.

    This fact is not that fun now that I think about it. Well, Anyway.

    Starting The Game

    Now that you have created a new instance of Game, you can now call methods inside it.

    The method start starts a new game in the instance of the Game you just created.

    Game.start() takes 4 arguements. 3 of them are required.

    • func
    • whitePlayer
    • blackPlayer
    • pre

    1. func

    This a function which prints the board each time a move occurs

    2. whitePlayer

    The ID of the white player

    3. blackPlayer

    The ID of the black player

    4. pre

    A function which will execute right after the move has been made.


    game.start((message) => {
        //This will print the board on to the console each time
    }, 'cool_unique_id', 'cooler_unique_id', () => console.log(game.board.getPieces()))

    Fun Fact: Every TypeScript user thinks they're gods. AND THEY'RE RIGHT!

    Making A Move

    Now we get to the fun part, Making a move. Step 1: Flir- oh wait, Wrong guide. Sorry about that. Where were we? Ah yes, Making a move IN THE GAME.

    To make a move, you have to emit an event in the eventEmitter object you passed in while consturcting


    While emiting you need to pass 3 arguments.

    • gameEventString
    • move
    • func
    • playerString

    1. gameEventString

    The string you passed in while constructing.

    2. move

    The move you want to make. It is an object which has 2 fields Those are from the current position of the piece and to the position to the piece move to.

    interface Move = {
        to: Tile
        from: Tile


    The genMove(): Tile | null function takes in 1 argument and returns the the Tile object if it's a valid position.

    3. func

    Function to print the board

    4. playerString

    The ID of the player whose making the move.


    import { EventEmitter } from 'events'
    import Game, { genMove } from 'chess-node'
    const game = new Game(new EventEmitter(), 'chess-game-1')
    game.start((message) => console.log, 'player_1', 'player_2')
    // Moves from B1 to C1
    const [from ,to] = [genMove('B1'), genMove('C1')]
    // Only allow valid moves to get passed
    if (!from || !to) return throw new Error('Invalid Move')
    game.eventEmitter.emit('chess-game-1', move, (message) => console.log(message), 'player')

    Ending the Game

    The eventEmitter will emit gameOver when the game ends. and It'll also print the board and winner in the func parameter while the game ends

    game.eventEmitter.emit('chess-game-1', move, (message) => console.log(message), 'player')

    if the game ends, it'll log one of the following strings:

    • <Colour_1> is in checkmate, <Colour_2> wins!
    • Stalemate

    That's about it. Better docs comming soon, Hopefully. Now try it out. Have a great day!



    npm i chess-node

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