🔒 Chess Game | Python | Page 1

limber gardenBOT Mar 14, 2024, 11:48 PM

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@severe venture

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severe venture Mar 14, 2024, 11:49 PM

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https://paste.pythondiscord.com/MLDQ

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I need some help with the code for checking if a space is already taken.

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It's under the verify_move function.

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But I'm having trouble getting it to work properly.

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@vocal epoch If you're still around I'd appreciate the help!

hollow beacon Mar 15, 2024, 12:17 AM

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severe venture I need some help with the code for checking if a space is already taken.

If I were you, I'd create a convert_pos_to_index function and go on from there to make another function that checks whether a position is already occupied

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Once you've done that, you can just convert the position at which you want to move into a usable index and from there decide what you want to do based on the piece that's there (you use your get_piece_in_position)

severe venture Mar 15, 2024, 12:22 AM

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hollow beacon If I were you, I'd create a convert_pos_to_index function and go on from there t...

So what should I keep or what should I get rid of here?

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I feel like I'm massively overcomplicating this.

hollow beacon Mar 15, 2024, 12:25 AM

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severe venture So what should I keep or what should I get rid of here?

Instead of a flat list with -1 for borders, use a matrix to represent the board

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That's the main source of "complications"

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This way you won't need to store piece positions as separate x_pos & y_pos

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And it will also facilitate the overall process for your new functions

severe venture Mar 15, 2024, 12:30 AM

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hollow beacon Instead of a flat list with -1 for borders, use a matrix to represent the board

So make it look like this.

# n_board = [[0 , 1 , 2 , 3 , 4 , 5 , 6 , 7]
#            [8 , 9 , 10, 11, 12, 13, 14, 15]
#            [16, 17, 18, 19, 20, 21, 22, 23]
#            [24, 25, 26, 27, 28, 29, 30, 31]
#            [32, 33, 34, 35, 36, 37, 38, 39]
#            [40, 41, 42, 43, 44, 45, 46, 47]
#            [48, 49, 50, 51, 52, 53, 54, 55]
#            [56, 57, 58, 59, 60, 61, 62, 63]]

hollow beacon Mar 15, 2024, 12:32 AM

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Something along these lines :

def __init__(self):
  self._board = [[None for _ in range(8)] for _ in range(8)]  # 8x8 board
  self._whose_turn = "White"
  self._turn_number = 1
  self._game_state = 'UNFINISHED'
  self.initialize_board()

def initialize_board(self):
  self._board[0][0] = ChessPiece("Rook", "a", "8", "Black")

severe venture Mar 15, 2024, 12:33 AM

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So I initialize each individual piece?

hollow beacon Mar 15, 2024, 12:34 AM

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It's similar to what you were doing before but in a better approach

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So yeah, you would still have to initialize each individual piece

severe venture Mar 15, 2024, 12:35 AM

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Okay let me add all of that.

severe venture Mar 15, 2024, 12:36 AM

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hollow beacon So yeah, you would still have to initialize each individual piece

Wait so do I need this then?
# n_board = [[0 , 1 , 2 , 3 , 4 , 5 , 6 , 7]
# [8 , 9 , 10, 11, 12, 13, 14, 15]
# [16, 17, 18, 19, 20, 21, 22, 23]
# [24, 25, 26, 27, 28, 29, 30, 31]
# [32, 33, 34, 35, 36, 37, 38, 39]
# [40, 41, 42, 43, 44, 45, 46, 47]
# [48, 49, 50, 51, 52, 53, 54, 55]
# [56, 57, 58, 59, 60, 61, 62, 63]]

hollow beacon Mar 15, 2024, 12:36 AM

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No you don't need this

severe venture Mar 15, 2024, 12:36 AM

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Ah okay.

hollow beacon Mar 15, 2024, 12:37 AM

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Do you understand what the code I sent does? Or at least why you don't need the n_board?

severe venture Mar 15, 2024, 12:37 AM

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I understand the initialization of the board by adding each individual piece.

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I don't understand why you don't need the board.

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Also, I have to add the color in the name.

hollow beacon Mar 15, 2024, 12:41 AM

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severe venture I don't understand why you don't need the board.

Think of self._board as your chessboard in the game, where you can see and move all the chess pieces. It's like a map that shows where everything is. The n_board idea, where you give each square a number from 0 to 63, isn't needed because self._board already makes it easy to see where the pieces are and how to move them

hollow beacon Mar 15, 2024, 12:43 AM

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severe venture Also, I have to add the color in the name.

That would be in the __init__ of your ChessPiece class

severe venture Mar 15, 2024, 12:44 AM

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hollow beacon Think of self._board as your chessboard in the game, where you can see and move ...

How do I initialize the matrix though?

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Here I'm initializing the individual locations but not the whole thing.

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    def initialize_board(self):
        """Initializes the board to be played on."""
        self._board[0][0] = ChessPiece("Black Rook 1", "a", "8")
        self._board[0][0] = ChessPiece("Black Knight 1", "b", "8")
        self._board[0][0] = ChessPiece("Black Bishop 1", "c", "8")
        self._board[0][0] = ChessPiece("Black Queen", "d", "8")
        self._board[0][0] = ChessPiece("Black King", "e", "8")
        self._board[0][0] = ChessPiece("Black Bishop 2", "f", "8")
        self._board[0][0] = ChessPiece("Black Knight 2", "g", "8")
        self._board[0][0] = ChessPiece("Black Rook 2", "h", "8")

        self._board[0][0] = ChessPiece("White Rook 1", "a", "1")
        self._board[0][0] = ChessPiece("White Knight 1", "b", "1")
        self._board[0][0] = ChessPiece("White Bishop 1", "c", "1")
        self._board[0][0] = ChessPiece("White Queen", "d", "1")
        self._board[0][0] = ChessPiece("White King", "e", "1")
        self._board[0][0] = ChessPiece("White Bishop 2", "f", "1")
        self._board[0][0] = ChessPiece("White Knight 2", "g", "1")
        self._board[0][0] = ChessPiece("White Rook 2", "h", "1")

        return self._board

hollow beacon Mar 15, 2024, 12:46 AM

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severe venture How do I initialize the matrix though?

You create the 8x8 board using:

self._board = [[None for _ in range(8)] for _ in range(8)]

And initialize it using:

self.initialize_board()

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!e

print([[None for _ in range(8)] for _ in range(8)])

limber gardenBOT Mar 15, 2024, 12:46 AM

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@hollow beacon :white_check_mark: Your 3.12 eval job has completed with return code 0.

[[None, None, None, None, None, None, None, None], [None, None, None, None, None, None, None, None], [None, None, None, None, None, None, None, None], [None, None, None, None, None, None, None, None], [None, None, None, None, None, None, None, None], [None, None, None, None, None, None, None, None], [None, None, None, None, None, None, None, None], [None, None, None, None, None, None, None, None]]

hollow beacon Mar 15, 2024, 12:48 AM

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severe venture ```py def initialize_board(self): """Initializes the board to be pla...

You're also making a mistake here by putting all the pieces in the same position

severe venture Mar 15, 2024, 12:48 AM

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Oh woops. forgot to update that.

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Okay so this goes in the ChessVar init

self.initialize_board()

hollow beacon Mar 15, 2024, 12:51 AM

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hollow beacon Something along these lines : ```py def __init__(self): self._board = [[None ...

Yes, this goes in the ChessVar class, and the first line of the __init__ is the "replacement" of your old n_board

severe venture Mar 15, 2024, 12:51 AM

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And then this goes in initialize board.

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self._board = [[None for _ in range(8)] for _ in range(8)]

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Gotcha.

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I understand.

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Here let me finish the pieces real quick.

severe venture Mar 15, 2024, 12:55 AM

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hollow beacon Yes, this goes in the `ChessVar` class, and the first line of the `__init__` is ...

Okay can you confirm I've done this right?

    def initialize_board(self):
        """Initializes the board to be played on."""
        self._board = [[None for _ in range(8)] for _ in range(8)]

        self._board[0][0] = ChessPiece("Black Rook 1", "a", "8")
        self._board[0][1] = ChessPiece("Black Knight 1", "b", "8")
        self._board[0][2] = ChessPiece("Black Bishop 1", "c", "8")
        self._board[0][3] = ChessPiece("Black Queen", "d", "8")
        self._board[0][4] = ChessPiece("Black King", "e", "8")
        self._board[0][5] = ChessPiece("Black Bishop 2", "f", "8")
        self._board[0][6] = ChessPiece("Black Knight 2", "g", "8")
        self._board[0][7] = ChessPiece("Black Rook 2", "h", "8")
        self._board[1][0] = ChessPiece("Black Pawn 1", "a", "7")
        self._board[1][1] = ChessPiece("Black Pawn 2", "b", "7")
        self._board[1][2] = ChessPiece("Black Pawn 3", "c", "7")
        self._board[1][3] = ChessPiece("Black Pawn 4", "d", "7")
        self._board[1][4] = ChessPiece("Black Pawn 5", "e", "7")
        self._board[1][5] = ChessPiece("Black Pawn 6", "f", "7")
        self._board[1][6] = ChessPiece("Black Pawn 7", "g", "7")
        self._board[1][7] = ChessPiece("Black Pawn 8", "h", "7")

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        self._board[7][0] = ChessPiece("White Rook 1", "a", "1")
        self._board[7][1] = ChessPiece("White Knight 1", "b", "1")
        self._board[7][2] = ChessPiece("White Bishop 1", "c", "1")
        self._board[7][3] = ChessPiece("White Queen", "d", "1")
        self._board[7][4] = ChessPiece("White King", "e", "1")
        self._board[7][5] = ChessPiece("White Bishop 2", "f", "1")
        self._board[7][6] = ChessPiece("White Knight 2", "g", "1")
        self._board[7][7] = ChessPiece("White Rook 2", "h", "1")
        self._board[6][0] = ChessPiece("White Pawn 1", "a", "2")
        self._board[6][1] = ChessPiece("White Pawn 2", "b", "2")
        self._board[6][2] = ChessPiece("White Pawn 3", "c", "2")
        self._board[6][3] = ChessPiece("White Pawn 4", "d", "2")
        self._board[6][4] = ChessPiece("White Pawn 5", "e", "2")
        self._board[6][5] = ChessPiece("White Pawn 6", "f", "2")
        self._board[6][6] = ChessPiece("White Pawn 7", "g", "2")
        self._board[6][7] = ChessPiece("White Pawn 8", "h", "2")

        return self._board

hollow beacon Mar 15, 2024, 12:56 AM

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severe venture Okay can you confirm I've done this right? ```py def initialize_board(self)...

Correct

severe venture Mar 15, 2024, 12:57 AM

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The second number in the self._board set has a little yellow squigly with an error in it.

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Unexpected type(s):(int, ChessPiece)Possible type(s):(SupportsIndex, None)(slice, Iterable[None])

hollow beacon Mar 15, 2024, 12:59 AM

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Can you send your code?

severe venture Mar 15, 2024, 1:00 AM

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https://paste.pythondiscord.com/CZMA

hollow beacon Mar 15, 2024, 1:02 AM

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I'm not getting anything on my side

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What did you do in order to get this?

severe venture Mar 15, 2024, 1:04 AM

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I just copied and pasted that.

hollow beacon Mar 15, 2024, 1:05 AM

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severe venture https://paste.pythondiscord.com/CZMA

I copy/pasted and executed and it just outputs:

White Pawn 1 is in a2
a2
a
2
this is n_square_start: None
a2
a
2
this is n_square_start: None
a2
a
2
this is n_square_start: None

severe venture Mar 15, 2024, 1:05 AM

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Well yeah it still has the old code.

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Is my syntax for putting the pieces in there incorrect?

hollow beacon Mar 15, 2024, 1:06 AM

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severe venture Unexpected type(s):(int, ChessPiece)Possible type(s):(SupportsIndex, None)(slice...

Ok but then where does this come from is what I'm asking

severe venture Mar 15, 2024, 1:06 AM

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From verify_move.

hollow beacon Mar 15, 2024, 1:06 AM

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That is in the code you just sent?

severe venture Mar 15, 2024, 1:07 AM

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Yeah it should be.

hollow beacon Mar 15, 2024, 1:07 AM

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How come I don't get any error then

severe venture Mar 15, 2024, 1:08 AM

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Oh it's not an error it's like a little yellow squiggly under it.

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See?

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Under the second int for setting up the board.

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Is it not the correct syntax for assigning a value to a matrix?

hollow beacon Mar 15, 2024, 1:11 AM

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I do not have this on my side either

severe venture Mar 15, 2024, 1:12 AM

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Huh.

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Well how can we test that it works?

hollow beacon Mar 15, 2024, 1:13 AM

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hollow beacon I copy/pasted and executed and it just outputs: ```py White Pawn 1 is in a2 a2 ...

Well as I said when I run your code it outputs this

severe venture Mar 15, 2024, 1:13 AM

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Yeah that's old code.

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I commented it out.

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You can remove it.

hollow beacon Mar 15, 2024, 1:14 AM

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I just copy/pasted the latest you sent me

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You're confusing me right now

severe venture Mar 15, 2024, 1:15 AM

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Yeah I just commented it out just now.

hollow beacon Mar 15, 2024, 1:15 AM

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What did you comment out lol

severe venture Mar 15, 2024, 1:15 AM

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A lot.

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https://paste.pythondiscord.com/7OGQ

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There's the recent version.

hollow beacon Mar 15, 2024, 1:17 AM

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Ok but now that you converted to a matrix a lot of your methods are obselete

severe venture Mar 15, 2024, 1:17 AM

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Yeah.

hollow beacon Mar 15, 2024, 1:17 AM

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But they are also a lot simpler to make now

severe venture Mar 15, 2024, 1:17 AM

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I like to hear that.

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Okay so we initialize the matrix and we need to be able to check the legality of moves in make_move.

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Here I'll just delete all the old stuff.

hollow beacon Mar 15, 2024, 1:18 AM

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So now we're back to my very first message

hollow beacon Mar 15, 2024, 1:18 AM

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hollow beacon If I were you, I'd create a convert_pos_to_index function and go on from there t...

This

severe venture Mar 15, 2024, 1:18 AM

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hollow beacon If I were you, I'd create a convert_pos_to_index function and go on from there t...

.

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Gotcha.

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Okay let me see if I can figure it out.

hollow beacon Mar 15, 2024, 1:22 AM

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Also you're not supposed to return the board in the initialize_board method

severe venture Mar 15, 2024, 1:22 AM

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Woops.

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Got it.

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Do you know why I can't see the readme in PyCharm?

hollow beacon Mar 15, 2024, 1:23 AM

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Not really

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I mainly use VSCode

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But there shouldn't be any issue with PyCharm

severe venture Mar 15, 2024, 1:23 AM

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Fixed it.

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Okay so I'm gonna take x_pos and y_pos and then convert to index.

hollow beacon Mar 15, 2024, 1:25 AM

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Ok so quick recap, the methods you will need in ChessVar are :

print_board
get_game_state
verify_move
make_move
convert_pos_to_index

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You shouldn't need any more than that except for the init and initialize obviously!

severe venture Mar 15, 2024, 1:26 AM

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Yeah it's just making those work.

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Is there a cleverer way to do convert_pos_to_index than if x_pos = a return 0?

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Feel like something like this could work

    def convert_pos_to_index(self, pos):
        """Converts the position to an index."""
        x_pos = pos[0]
        y_pos = pos[1]

        for i in range(0, 7):
            if i == x_pos:
                return

hollow beacon Mar 15, 2024, 1:30 AM

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My convert_pos_to_index converts a board position to array indices

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So like a8 to something

severe venture Mar 15, 2024, 1:31 AM

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And array indices are like [0][0] right?

hollow beacon Mar 15, 2024, 1:31 AM

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Exactly

severe venture Mar 15, 2024, 1:31 AM

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I'm trying to do that but I don't want to do this stupid looking if chain.

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        if x_pos == "a":
            return 0
        if x_pos == "b":
            return 1

hollow beacon Mar 15, 2024, 1:32 AM

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You don't need to

severe venture Mar 15, 2024, 1:32 AM

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How do I do it better?

hollow beacon Mar 15, 2024, 1:33 AM

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You can calculate the x coordinate using ord()

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and then y coordinate normally because you know its a 8x8 board

severe venture Mar 15, 2024, 1:33 AM

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I don't think I'm allowed to use that.

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We're not allowed to use anything we haven't been taught in our courses.

hollow beacon Mar 15, 2024, 1:34 AM

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Oh is this an assignment?

severe venture Mar 15, 2024, 1:34 AM

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Yeah it is.

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And I'm struggling.

hollow beacon Mar 15, 2024, 1:34 AM

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I see

severe venture Mar 15, 2024, 1:34 AM

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So is there a way to iterate through without ord?

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Or any other way to avoid the if chain?

hollow beacon Mar 15, 2024, 1:35 AM

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Have you been taught about dictionaries?

severe venture Mar 15, 2024, 1:35 AM

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Yup I have.

hollow beacon Mar 15, 2024, 1:36 AM

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Then yes there's still a very simple way

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By creating a mapping of the columns ('a' through 'h') to their respective index (0 through 7)

severe venture Mar 15, 2024, 1:37 AM

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 pos_dict = {
            "a": 0,
            "b": 1,
            "c": 2,
            "d": 3,
            "e": 4,

hollow beacon Mar 15, 2024, 1:37 AM

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And the y coordinate formula stays the same

severe venture Mar 15, 2024, 1:37 AM

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Like this, correct?

hollow beacon Mar 15, 2024, 1:37 AM

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Correct

severe venture Mar 15, 2024, 1:37 AM

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Great!

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And then y_pos I just need to subtract one from, yes?

hollow beacon Mar 15, 2024, 1:38 AM

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Well, it's not that I don't like helping you but it's near 3AM at my place, I might have to stop the fun here

severe venture Mar 15, 2024, 1:39 AM

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No worries at all. Would you maybe have some time tomorrow?

hollow beacon Mar 15, 2024, 1:39 AM

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severe venture And then y_pos I just need to subtract one from, yes?

I don't think so

severe venture Mar 15, 2024, 1:40 AM

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Well 8th file on the chess board would be 7th index right?

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    # n_board = [[0 , 1 , 2 , 3 , 4 , 5 , 6 , 7]
    #           [8 , 9 , 10, 11, 12, 13, 14, 15]
    #           [16, 17, 18, 19, 20, 21, 22, 23]
    #           [24, 25, 26, 27, 28, 29, 30, 31]
    #           [32, 33, 34, 35, 36, 37, 38, 39]
    #           [40, 41, 42, 43, 44, 45, 46, 47]
    #           [48, 49, 50, 51, 52, 53, 54, 55]
    #           [56, 57, 58, 59, 60, 61, 62, 63]]

hollow beacon Mar 15, 2024, 1:41 AM

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severe venture Well 8th file on the chess board would be 7th index right?

That's right

severe venture Mar 15, 2024, 1:41 AM

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So shouldn't that be -1 from y_pos?

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If I pass in "a8" then to reference that index it should be [7][7] I think.

hollow beacon Mar 15, 2024, 1:44 AM

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severe venture So shouldn't that be -1 from y_pos?

When you say that, what do you have in mind in raw code? Because I don't think you're thinking of the right math

severe venture Mar 15, 2024, 1:44 AM

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I'll figure it out. 😄 Can't be too hard.

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So would you have some time tomorrow to help me maybe?

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I can work around your schedule.

hollow beacon Mar 15, 2024, 1:45 AM

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I would be surprised if nobody helped you until then

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I'll let you know if you're still in need

severe venture Mar 15, 2024, 1:45 AM

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Yes but you get very different help/approaches depending on who helps.

hollow beacon Mar 15, 2024, 1:45 AM

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severe venture Yes but you get very different help/approaches depending on who helps.

True, I might not be the best teacher to be fair haha

severe venture Mar 15, 2024, 1:45 AM

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No I think you're great!

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I appreciate you taking the time to answer my questions and help me.

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And I'll let you get some sleep so have a great night!

hollow beacon Mar 15, 2024, 1:46 AM

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Alright, will make sure to let you know

severe venture Mar 15, 2024, 1:47 AM

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Thanks!

hollow beacon Mar 15, 2024, 1:47 AM

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Peepo_Sleep

severe venture Mar 15, 2024, 1:47 AM

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!close

limber gardenBOT Mar 15, 2024, 1:47 AM

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Python help channel closed

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