How do I program Chess game?

Programming chess is a big task, even if you want to do only the basic movement and logic, without the AI. I would suggest using a JS library like this one:

github.com/jhlywa/chess.js

All you need to do is call its methods and refresh sprites position on the layout.

Here is a demo. Read the documentation for the library, there are many methods, I used just a couple to make a quick example.

dropbox.com/s/j0gfaylmr53eoj1/ChessJS.c3p

You have used javascript programming in the sample and I don't have javascript knowledge nor other programming language. So instead of doing

runtime.globalVars.textBoard = chess.ascii();

how can I save chess.ascii() in textBoard directly?

BTW I created chessboard in construct and then I created movements for each player.

there were few things which I didn't made yet, restricted moves for king, castling and en passent square.

runtime.globalVars.textBoard = chess.ascii();

how can I save chess.ascii() in textBoard directly?

That was saving chess.ascii() in textBoard directly.

You don't need Javascript knowledge, I don't have it either.

few things which I didn't made yet, restricted moves for king, castling and en passent square.

You think there are only a few things left, but you don't realize how many different rules and restrictions there are in chess. If you look at the chess.js code, there are over 1900 lines of code! It's much easier to use the library, than creating all this logic yourself.

I didn't used this library and continued making chess myself from scratch.

Reason I am not using library.

1. I don't know how to call those library values into sprite positions.

2. I want to make chess myself.

as basic moves are created Now I am working on special moves.

"castling" move is done

"in passing" is done

"kings" restricted moves also done.

Now working on "restrict other players" if their move can kill king.

you were right its not easy.

Can you little explain from your demo how can I convert those "textBoard" into sprite positions.

.ascii() is only for debugging.

You can use .board() method to get an array with all pieces positions.

Everything is explained here:

github.com/jhlywa/chess.js

I have read there but still I didn't know what to do and how to do with this

const chess = new Chess()

chess.board()
// -> [[{type: 'r', color: 'b'},
 {type: 'n', color: 'b'},
 {type: 'b', color: 'b'},
 {type: 'q', color: 'b'},
 {type: 'k', color: 'b'},
 {type: 'b', color: 'b'},
 {type: 'n', color: 'b'},
 {type: 'r', color: 'b'}],
 [...],
 [...],
 [...],
 [...],
 [...],
 [{type: 'r', color: 'w'},
 {type: 'n', color: 'w'},
 {type: 'b', color: 'w'},
 {type: 'q', color: 'w'},
 {type: 'k', color: 'w'},
 {type: 'b', color: 'w'},
 {type: 'n', color: 'w'},
 {type: 'r', color: 'w'}]]

I think you can load it into JSON object. Then use JSON data directly, or transfer it to an array/tilemap.

still out of my head

but I'll think of it

Chess ai typically uses the "minimax algorithm" to decide its best move. This basically loops over all the pieces and plays them, then looks at all the outcomes and scores it, then does the same for all the player pieces. Thats a lot of calculations. It then picks the move with the best outcome. It does this a number of turns ahead. The more turns it looks ahead the smarter the ai is, but the more calculations it has to do.

This is something that events are not good at and is also very slow in c3, thats why you need to use js.

ai is a long way away currently I am struggling on how to apply these api's in sprites.