#Chess pieces moves code how to#
#Chess pieces moves code update#

gid-a unique game ID (I used nanoid)-I’ll use this to connect moves to a single game in the future.

from and to-indicating what move occurred (I use this to highlight the squares).

Moving the pawn from D2 to D4 in a new game- īlack countering with a similar move of pawn from D7 to D5. Here's what a couple of game moves look like: A short time later, I had it working! Stretch goal #1 completed.

#Chess pieces moves code how to#

I originally thought that making this service aware of chess rules would be difficult, but then I saw the example in the chessboard.js docs showing how to integrate it with another library called chess.js-“ a JavaScript chess library that is used for chess move generation/validation, piece placement/movement, and check/checkmate/stalemate detection-basically everything but the AI”. In only two hours, I had the basic functionality implemented.

#Chess pieces moves code update#

I quickly discovered that this library can display chess boards from a FEN, allow pieces to be moved, and update the FEN. One in particular that caught my eye was chessboard.js-described as “ a JavaScript chessboard component with a flexible ‘just a board’ API”. Displaying the chessboard and allowing drag-and-drop moves I knew I could use this in the URL, so my first requirement was complete and I was able to represent the board state in the URL eliminating the need for a backend data store.

The last part of the string is specific to certain rules in chess ( read more about FEN). Uppercase letters represent white pieces and lowercase letters represent black. Rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1Įach letter is a piece: pawn = 'P', knight = 'N', bishop = 'B', rook = 'R', queen = 'Q' and king = 'K'. For example, the starting position for any chess game can be represented by the following string: There is a standard notation for describing a particular board position of a chess game called Forsyth–Edwards Notation (FEN) that was exactly what I needed. Putting it all together Representing the board position Dynamically create a png/jpg of the chessboard that I can use as an Open Graph and Twitter card image so that when a player sends the link, the image of the board will automatically display.Enforce chess rules (allow only legal moves).Display a chessboard and let the player make their next move.Represent the board position-ideally completely in the URL to keep it stateless from a server-side perspective.Excited about this idea, I put together a shopping list: I wanted this to be 100% serverless, meaning that it will scale to zero and have zero maintenance requirements. Instead of tweeting moves back and forth, players tweet links back and forth, and those links go to a site that renders the current chessboard, allows a new move, and creates a new link to paste back to the opponent. I didn't have a lot of time, so I was optimizing for simplicity.

Instead of designing yet another chess site (I built one with a friend in 2009 that is long since gone), I decided to create a chess board logger and visualizer to make it practical to play via Twitter or any other messaging/social platform. Later in the day, I had the idea to create a simple service that enables my use case. If I received multiple responses, I’d need multiple boards. I paused before hitting the tweet button because I realized that I’d need to set up a board (physical or virtual) to keep track of the game. I was eager to play a game, so I started to tweet, “D2-D4” knowing that some of Twitter followers would recognize this as an opening move and likely respond with their move, giving me the fix I needed.

'checkfp.m' checks whether the position desired is possible or not, and gives the message if not possible.Ĭurrently the winner has to kill the king while i realized that it should not be the case, it should detect the checkmate condition, so dont worry i am gonna update this in few coming days.While watching The Queen’s Gambit, I was reminded about how much I used to enjoy playing chess. This function then calls different functions to check the position of the piece, win loss, etc The main m file just calls function 'playerturn.m' as the input is given by the user. The main function to run is CHESS_on_MATLAB.m I am working to change this logic as it should check for CHECK MATE also. Its a two player game, i am working on developing artificial intelligence based computer player.Ī 2D array is updated by the position of the chess pieces which are numbered (each piece corresponding to a number)Īs the player selects a piece the corresponding number is checked for all possible places where it can move, then the program waits for the second place where it has to be moved.Īfter each turn the program calls the function 'wholoses.m' which will see whether the king is there or not.