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from typing import Optional
import chess
WHITE_PIECE_COLOR = "\033[97m" # Bright white
BLACK_PIECE_COLOR = "\033[90m" # Bright black (gray)
LIGHT_SQUARE_BG = "\033[50m" # White background
DARK_SQUARE_BG = "\033[47m" # Standard blue background (darker/more blue)
RESET = "\033[0m"
UNICODE_PIECES = {
"P": "♙",
"N": "♘",
"B": "♗",
"R": "♖",
"Q": "♕",
"K": "♔",
"p": "♟",
"n": "♞",
"b": "♝",
"r": "♜",
"q": "♛",
"k": "♚",
}
def colored_unicode_board(fen: Optional[str] = None) -> str:
if fen is None:
fen = chess.STARTING_FEN
board = chess.Board(fen)
board_str = ""
white_to_move = board.turn
# Decide ranks and files order depending on who's to move
if white_to_move:
ranks = range(8, 0, -1) # 8 to 1
files = range(1, 9) # a to h
else:
ranks = range(1, 9) # 1 to 8
files = range(8, 0, -1) # h to a (reverse files)
for rank in ranks:
board_str += f"{rank} "
for file in files:
square = chess.square(file - 1, rank - 1)
piece = board.piece_at(square)
# Correct square color for orientation
if (rank + file) % 2 == 1:
bg = LIGHT_SQUARE_BG
else:
bg = DARK_SQUARE_BG
if piece:
fg = (
WHITE_PIECE_COLOR
if piece.color == chess.WHITE
else BLACK_PIECE_COLOR
)
symbol = UNICODE_PIECES[piece.symbol()]
board_str += f"{bg}{fg} {symbol} {RESET}"
else:
board_str += f"{bg} {RESET}"
board_str += "\n"
# Files labels in proper order
if white_to_move:
files_label = "a b c d e f g h"
else:
files_label = "h g f e d c b a"
board_str += " " + files_label + "\n"
return board_str
if __name__ == "__main__":
# Example usage:
board = chess.Board()
fen = board.fen()
print(colored_unicode_board(fen))
# Try switching turns for demo:
print(colored_unicode_board())
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