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# Goal: To create a simple bitboard implementation for a chess board,
# move class to prompt the user for a move, update the bitboard with the move,
# and track changes between bitboards to test keeping track of individual pieces and to check for move legality
# RealBoard class is a simple 2D array representation of a chess board with pieces/colors, black pieces are lowercase and white pieces are uppercase. This is what will track the actual state of the game/pieces.
# Bitboard class is a 64 bit integer representation of the chess board, where each bit represents a square on the board.
#when "square" is used, it refers to a coordinate on the chess board in, where a1 is the bottom left corner, and h8 is the top right corner.
#when "position" is used, it refers to the bitboard position, where 0 is the top left corner, and 63 is the bottom right corner.
#for reference
# 8 | 0 1 2 3 4 5 6 7
# 7 | 8 9 10 11 12 13 14 15
# 6 | 16 17 18 19 20 21 22 23
# 5 | 24 25 26 27 28 29 30 31
# 4 | 32 33 34 35 36 37 38 39
# 3 | 40 41 42 43 44 45 46 47
# 2 | 48 49 50 51 52 53 54 55
# 1 | 56 57 58 59 60 61 62 63
# -------------------------
# a b c d e f g h
from os import path
import re
import subprocess
import display_output
import chess
import chess.pgn
gamestate = 0
turn = 'white'
# Path to the Stockfish binary
STOCKFISH_PATH = 'stockfish'
# Automated test mode flag
AUTOMATED_TEST_MODE = True # Set to False for manual input mode
# Set the Stockfish engine difficulty level from 1 to 8 (based on lichess)
STOCKFISH_DIFFICULTY = 8
""" Level 1: Skill -9, Depth 5, 50ms
Level 2: Skill -5, Depth 5, 100ms
Level 3: Skill -1, Depth 5, 150ms
Level 4: Skill 3, Depth 5, 200ms
Level 5: Skill 7, Depth 5, 300ms
Level 6: Skill 11, Depth 8, 400ms
Level 7: Skill 16, Depth 13, 500ms
Level 8: Skill 20, Depth 22, 1000ms """
class RealBoard:
def __init__(self):
self.board = [
['r', 'n', 'b', 'q', 'k', 'b', 'n', 'r'],
['p', 'p', 'p', 'p', 'p', 'p', 'p', 'p'],
['.', '.', '.', '.', '.', '.', '.', '.'],
['.', '.', '.', '.', '.', '.', '.', '.'],
['.', '.', '.', '.', '.', '.', '.', '.'],
['.', '.', '.', '.', '.', '.', '.', '.'],
['P', 'P', 'P', 'P', 'P', 'P', 'P', 'P'],
['R', 'N', 'B', 'Q', 'K', 'B', 'N', 'R']
]
self.white_king_moved = False
self.white_king_side_rook_moved = False
self.white_queen_side_rook_moved = False
self.black_king_moved = False
self.black_king_side_rook_moved = False
self.black_queen_side_rook_moved = False
self.white_castled = False
self.black_castled = False
def print_board(self):
"""Print the board."""
for row in self.board:
print(' '.join(row))
def draw_board(self, player_piece=0, player_move=0, chessbot_piece=0, chessbot_move=0):
"""Draw the board with the pieces and moves made."""
display_output.draw_board(self.board, player_piece, player_move, chessbot_piece, chessbot_move, gamestate)
def print_pretty_board(self):
board=zip(self.get_pretty_board_representation())
#print the array
for row in board:
print(' '.join(row))
print()
def get_pretty_board_representation(self):
"""Print the board with alphabetical chess coordinate markers as the last row and numerical markers as first coloumn ."""
#easier to just make it into a 10x10 array and then just print the array
#first two coloumns are for the numbers, and a decorative divider "|"
#the last two rows are for the letters, and a decorative divider "-"
#create a 10x10 array
board = [['.' for _ in range(10)] for _ in range(10)]
#set bottom right 4 spaces in array to be unicode ▨
board[8][0] = chr(0x25A8)
board[8][1] = chr(0x25A8)
board[9][0] = chr(0x25A8)
board[9][1] = chr(0x25A8)
#set the first col to be 8 through 1
for i in range(8):
board[i][0] = str(8 - i)
#set the second col to be all "|"
for i in range(8):
board[i][1] = chr(9475)
#set the second to last col to be all unicode ━
for i in range(8):
board[8][i + 2] = chr(9473)
#set the last row to be a through h
for i in range(8):
board[9][i + 2] = chr(97 + i)
# #set the pieces on the board per the bitboard
for row in range(8):
for col in range(8):
piece = self.board[row][col]
board[row][col + 2] = piece
board_representation = []
for row in board:
board_representation.append(' '.join(row))
return board_representation
def piece_symbol_to_piece_name(self, symbol):
"""Convert the piece symbol to the piece name."""
# Map the piece symbol to the corresponding piece name
if symbol == 'P':
return 'White Pawn'
elif symbol == 'N':
return 'White Knight'
elif symbol == 'B':
return 'White Bishop'
elif symbol == 'R':
return 'White Rook'
elif symbol == 'Q':
return 'White Queen'
elif symbol == 'K':
return 'White King'
elif symbol == 'p':
return 'Black Pawn'
elif symbol == 'n':
return 'Black Knight'
elif symbol == 'b':
return 'Black Bishop'
elif symbol == 'r':
return 'Black Rook'
elif symbol == 'q':
return 'Black Queen'
elif symbol == 'k':
return 'Black King'
else:
return 'Unknown Piece'
def clear_piece(self, square):
"""Clear (remove) a piece from the board at the specified square."""
# Convert the square to the corresponding row and column indices
row = 8 - int(square[1])
col = ord(square[0]) - ord('a')
# Clear the piece at the specified row and column
self.board[row][col] = '.'
def set_piece(self, square, piece_symbol):
"""Set a piece on the board at the specified square."""
# Convert the square to the corresponding row and column indices
row = 8 - int(square[1])
col = ord(square[0]) - ord('a')
# Set the piece at the specified row and column
self.board[row][col] = piece_symbol
def bitboard_position_to_realboard_position(position):
"""Convert the bitboard position to the real board position. Reverse of Move.square_to_bitboard_position"""
# Map the position to the corresponding letter/number combo
#for reference:
# 8 | 0 1 2 3 4 5 6 7
# 7 | 8 9 10 11 12 13 14 15
# 6 | 16 17 18 19 20 21 22 23
# 5 | 24 25 26 27 28 29 30 31
# 4 | 32 33 34 35 36 37 38 39
# 3 | 40 41 42 43 44 45 46 47
# 2 | 48 49 50 51 52 53 54 55
# 1 | 56 57 58 59 60 61 62 63
# -------------------------
# a b c d e f g h
# Calculate the row number (8 to 1) by subtracting the position from 63
row_num = 8 - (position // 8)
# Calculate the column letter (a to h) by adding the position to the ASCII value of 'a'
col_letter = chr((position % 8) + ord('a'))
# Return the letter/number combo
return col_letter + str(row_num)
def square_to_bitboard_position(square):
# Map the letter/number combos to their respective position on the board
#for reference:
# 8 | 0 1 2 3 4 5 6 7
# 7 | 8 9 10 11 12 13 14 15
# 6 | 16 17 18 19 20 21 22 23
# 5 | 24 25 26 27 28 29 30 31
# 4 | 32 33 34 35 36 37 38 39
# 3 | 40 41 42 43 44 45 46 47
# 2 | 48 49 50 51 52 53 54 55
# 1 | 56 57 58 59 60 61 62 63
# -------------------------
# a b c d e f g h
# Extract the column letter and row number from the input
col_letter, row_num = square[0], int(square[1])
# Calculate the column index (0 to 7)
col_index = ord(col_letter) - ord('a')
# Calculate the row's starting index, considering the board's layout
# Row '1' corresponds to the 8th row in the grid, hence '8 - row_num'
row_start_index = (8 - row_num) * 8
# Calculate the position by adding the column index to the row's starting index
position = row_start_index + col_index
return position
def First_move_compare_and_update(self, default_board, new_bitboard):
"""Compare the bitboard after the first move to the default starting chessboard. Outputs the move made!"""
#bitboard is a 64 bit integer representation of the chess board, where each bit represents a square on the board.
#compare the bitboard to the default board
if default_board.board == new_bitboard.board:
print("Detected no moves made!")
return
else:
print("Detected that a move has been made!")
#find the move made
xor = default_board.board ^ new_bitboard.board #find the differences between the two bitboards
# handle castle moves
#throw error if xor is 0, no move was made (shouldn't happen)
if xor == 0:
print("Error, xor == 0, No moves made!")
return
positions_changed = Bitboard.decompose_bitboard(xor)
if positions_changed == 0:
print("Error, No positions changed!")
return
square_a = RealBoard.bitboard_position_to_realboard_position(positions_changed[1])
square_b = RealBoard.bitboard_position_to_realboard_position(positions_changed[0])
#determine which square is the from_square and which is the to_square
if new_bitboard.is_occupied(positions_changed[1]): #TODO: This is a hacky way to determine which square is the from_square and which is the to_square, but it works for now, need to test more to see if it is reliable
from_square = square_b
to_square = square_a
else:
from_square = square_a
to_square = square_b
print(f"Detected move made from {from_square} to {to_square}") #if this matches the user input, then the bitboard analysis is working correctly!!!
#check what piece was moved from the from_square to the to_square
#since this is the first move, we can assume that the piece moved is the only piece that has changed positions so far into the game, so the starting chessboard is used for comparison
#find the piece that was moved by looking at what piece was at the from_square on the default_board
piece = self.board[8 - int(from_square[1])][ord(from_square[0]) - ord('a')]
print(f"Detected piece moved: {piece}: {self.piece_symbol_to_piece_name(piece)}")
#update the real board with the move made
self.clear_piece(from_square)
self.set_piece(to_square, piece)
return self
def move_compare_update(self, old_board, new_bitboard):
"""Compare the bitboard after the first move to the default starting chessboard. Outputs the move made!"""
#bitboard is a 64 bit integer representation of the chess board, where each bit represents a square on the board.
if old_board == -1:
print("Error, old_board is -1 in move_compare_update")
return
if new_bitboard == -1:
print("Error, new_bitboard is -1 in move_compare_update")
return
#compare the bitboard to the default board
if old_board.board == new_bitboard.board:
print("Error, Detected no moves made!")
return
else:
print("Detected that a move has been made!")
#find the move made
xor = old_board.board ^ new_bitboard.board #find the differences between the two bitboards
#throw error if xor is 0, no move was made (shouldn't happen)
if xor == 0:
print("Error in First_move_compare_and_update, xor == 0, No moves made!")
return
positions_changed = Bitboard.decompose_bitboard(xor)
if positions_changed == 0:
print("Error in First_move_compare_and_update, No positions changed!")
return
elif positions_changed == [60, 61, 62, 63]:
print("Detected White kingside castle")
from_square = 'e1'
to_square = 'g1'
elif positions_changed == [56,58,59,60]:
print("Detected White queenside castle")
from_square = 'e1'
to_square = 'c1'
elif positions_changed == [4, 5, 6, 7]:
print("Detected Black kingside castle")
from_square = 'e8'
to_square = 'g8'
elif positions_changed == [4, 3, 2, 1, 0]:
print("Detected Black queenside castle")
from_square = 'e8'
to_square = 'c8'
else:
square_a = RealBoard.bitboard_position_to_realboard_position(positions_changed[1])
square_b = RealBoard.bitboard_position_to_realboard_position(positions_changed[0])
#determine which square is the from_square and which is the to_square
if new_bitboard.is_occupied(positions_changed[1]): #TODO: This is a hacky way to determine which square is the from_square and which is the to_square, but it works for now, need to test more to see if it is reliable
from_square = square_b
to_square = square_a
else:
from_square = square_a
to_square = square_b
print(f"Detected move made from {from_square} to {to_square}") #if this matches the user input, then the bitboard analysis is working correctly!!!
#check what piece was moved from the from_square to the to_square
#since this is the first move, we can assume that the piece moved is the only piece that has changed positions so far into the game, so the starting chessboard is used for comparison
#find the piece that was moved by looking at what piece was at the from_square on the old_board
self.last_piece_moved = self.board[8 - int(from_square[1])][ord(from_square[0]) - ord('a')]
print(f"Detected piece moved: {self.last_piece_moved}: {self.piece_symbol_to_piece_name(self.last_piece_moved)}")
#check if promotion was made
if new_bitboard.last_move_promotion != 0:
self.clear_piece(from_square)
if turn == 'white':
print(f"Detected pawn promoted to " + self.piece_symbol_to_piece_name(new_bitboard.last_move_promotion.upper))
self.set_piece(to_square, new_bitboard.last_move_promotion.upper())
else:
print(f"Detected pawn promoted to " + self.piece_symbol_to_piece_name(new_bitboard.last_move_promotion.lower))
self.set_piece(to_square, new_bitboard.last_move_promotion)
self.last_move_made_UCI = f"{from_square}{to_square}{new_bitboard.last_move_promotion}"
return self
#update the real board with the move made
self.last_move_made_UCI = f"{from_square}{to_square}"
#check if the piece moved was a king or rook, and update the corresponding flags, for castle legality checking
if self.last_piece_moved == 'K':
self.white_king_moved = True
if self.last_piece_moved == 'R':
if from_square == 'a1':
self.white_queen_side_rook_moved = True
if from_square == 'h1':
self.white_king_side_rook_moved = True
if self.last_piece_moved == 'k':
self.black_king_moved = True
if self.last_piece_moved == 'r':
if from_square == 'a8':
self.black_queen_side_rook_moved = True
if from_square == 'h8':
self.black_king_side_rook_moved = True
if self.last_piece_moved == 'K' and from_square == 'e1' and to_square == 'g1':
#white kingside castle
self.white_castled = True
self.clear_piece(from_square)
self.set_piece(to_square, self.last_piece_moved)
self.clear_piece('h1')
self.set_piece('f1', 'R')
elif self.last_piece_moved == 'K' and from_square == 'e1' and to_square == 'c1':
#white queenside castle
self.white_castled = True
self.clear_piece(from_square)
self.set_piece(to_square, self.last_piece_moved)
self.clear_piece('a1')
self.set_piece('d1', 'R')
elif self.last_piece_moved == 'k' and from_square == 'e8' and to_square == 'g8':
#black kingside castle
self.black_castled = True
self.clear_piece(from_square)
self.set_piece(to_square, self.last_piece_moved)
self.clear_piece('h8')
self.set_piece('f8', 'r')
elif self.last_piece_moved == 'k' and from_square == 'e8' and to_square == 'c8':
#black queenside castle
self.black_castled = True
self.clear_piece(from_square)
self.set_piece(to_square, self.last_piece_moved)
self.clear_piece('a8')
self.set_piece('d8', 'r')
else:
# print(f"Last move made in UCI format: {self.last_move_made_UCI}")
self.clear_piece(from_square)
self.set_piece(to_square, self.last_piece_moved)
return self
def capture_compare_update(self, old_board, new_bitboard_a, new_bitboard_b):
"""Checks the two bitboards given during a capture, and updates the real board with the move made!"""
# compare a with old_board and b with old_board
# one of the two has the target piece misisng, and the other has the attacking piece missing
# the target piece will be the to_square, and the attacking piece will be the from_square
xor_a = old_board.board ^ new_bitboard_a.board #find the differences between the two bitboards
position_changed_a = Bitboard.decompose_bitboard(xor_a)
xor_b = old_board.board ^ new_bitboard_b.board #find the differences between the two bitboards
position_changed_b = Bitboard.decompose_bitboard(xor_b)
print(f"position_changed_a: {position_changed_a}")
print(f"position_changed_b: {position_changed_b}")
square_a = RealBoard.bitboard_position_to_realboard_position(position_changed_a[0])
square_b = RealBoard.bitboard_position_to_realboard_position(position_changed_b[0])
#determine what pieces are at the positions changed
piece_a = self.board[8 - int(square_a[1])][ord(square_a[0]) - ord('a')]
piece_b = self.board[8 - int(square_b[1])][ord(square_b[0]) - ord('a')]
print(f"piece_a: {piece_a}")
print(f"piece_b: {piece_b}")
if turn == 'white': # then the upper case letter is the attacking piece
if piece_a.isupper():
from_square = RealBoard.bitboard_position_to_realboard_position(position_changed_a[0])
to_square = RealBoard.bitboard_position_to_realboard_position(position_changed_b[0])
print(f"Detected move made from {from_square} to {to_square}. Captured a piece!")
self.last_piece_moved = self.board[8 - int(from_square[1])][ord(from_square[0]) - ord('a')]
print(f"Detected piece moved: {self.last_piece_moved}: {self.piece_symbol_to_piece_name(self.last_piece_moved)}")
else:
from_square = RealBoard.bitboard_position_to_realboard_position(position_changed_b[0])
to_square = RealBoard.bitboard_position_to_realboard_position(position_changed_a[0])
print(f"Detected move made from {from_square} to {to_square}. Captured a piece!")
self.last_piece_moved = self.board[8 - int(from_square[1])][ord(from_square[0]) - ord('a')]
print(f"Detected piece moved: {self.last_piece_moved}: {self.piece_symbol_to_piece_name(self.last_piece_moved)}")
else: # then the lower case letter is the attacking piece
if piece_a.islower():
from_square = RealBoard.bitboard_position_to_realboard_position(position_changed_a[0])
to_square = RealBoard.bitboard_position_to_realboard_position(position_changed_b[0])
print(f"Detected move made from {from_square} to {to_square}. Captured a piece!")
self.last_piece_moved = self.board[8 - int(from_square[1])][ord(from_square[0]) - ord('a')]
print(f"Detected piece moved: {self.last_piece_moved}: {self.piece_symbol_to_piece_name(self.last_piece_moved)}")
else:
from_square = RealBoard.bitboard_position_to_realboard_position(position_changed_b[0])
to_square = RealBoard.bitboard_position_to_realboard_position(position_changed_a[0])
print(f"Detected move made from {from_square} to {to_square}. Captured a piece!")
self.last_piece_moved = self.board[8 - int(from_square[1])][ord(from_square[0]) - ord('a')]
print(f"Detected piece moved: {self.last_piece_moved}: {self.piece_symbol_to_piece_name(self.last_piece_moved)}")
#update the real board with the move made
self.last_move_made_UCI = f"{from_square}{to_square}"
self.clear_piece(from_square)
self.set_piece(to_square, self.last_piece_moved)
return self
class Bitboard:
def __init__(self):
# Initialize an empty board, where 0 represents no pieces on the board
self.board = 0
self.last_move_promotion = 0
def set_piece(self, position):
"""Set a piece on the board at the specified position (0-63)."""
if 0 <= position < 64:
self.board |= 1 << position
else:
raise ValueError("Position must be between 0 and 63")
def chessboard_setup(self):
"""Set up the default chess board pieces."""
#setup white pieces by placing a piece at positions a1, b1, c1, d1, e1, f1, g1, h1, and
# then at a2, b2, c2, d2, e2, f2, g2, h2
for i in range(8):
self.set_piece(i)
self.set_piece(i + 8)
#setup black pieces by placing a piece at positions a8, b8, c8, d8, e8, f8, g8, h8, and
# then at a7, b7, c7, d7, e7, f7, g7, h7
for i in range(48, 56):
self.set_piece(i)
self.set_piece(i + 8)
def decompose_bitboard(bitboard):
"""Decompose the bitboard into a list of positions."""
positions = []
for i in range(64):
if bitboard & (1 << i):
positions.append(i)
return positions
def clear_piece(self, position):
"""Clear (remove) a piece from the board at the specified position (0-63)."""
if 0 <= position < 64:
self.board &= ~(1 << position)
else:
raise ValueError("Position must be between 0 and 63")
def is_occupied(self, position):
"""Check if there is a piece at the specified position (0-63)."""
if 0 <= position < 64:
return bool(self.board & (1 << position))
else:
raise ValueError("Position must be between 0 and 63")
def copy(self):
"""Return a copy of the current board."""
new_board = Bitboard()
new_board.board = self.board
return new_board
def print_board(self):
"""Print the board."""
for row in range(8):
for col in range(8):
position = row * 8 + col
piece = '1' if self.is_occupied(position) else '.'
print(piece, end=' ')
print() # Newline for each row
def print_pretty_board(self):
board=zip(self.get_pretty_board_representation())
#print the array
for row in board:
print(' '.join(row))
print()
def get_pretty_board_representation(self):
"""Print the board with alphabetical chess coordinate markers as the last row and numerical markers as first coloumn ."""
#easier to just make it into a 10x10 array and then just print the array
#first two coloumns are for the numbers, and a decorative divider "|"
#the last two rows are for the letters, and a decorative divider "-"
#create a 10x10 array
board = [['.' for _ in range(10)] for _ in range(10)]
#set bottom right 4 spaces in array to be unicode ▨
board[8][0] = chr(0x25A8)
board[8][1] = chr(0x25A8)
board[9][0] = chr(0x25A8)
board[9][1] = chr(0x25A8)
#set the first col to be 8 through 1
for i in range(8):
board[i][0] = str(8 - i)
#set the second col to be all "|"
for i in range(8):
board[i][1] = chr(9475)
#set the second to last col to be all unicode ━
for i in range(8):
board[8][i + 2] = chr(9473)
#set the last row to be a through h
for i in range(8):
board[9][i + 2] = chr(97 + i)
# #set the pieces on the board per the bitboard
for row in range(8):
for col in range(8):
position = row * 8 + col
piece = '1' if self.is_occupied(position) else '.'
board[row][col + 2] = piece
board_representation = []
for row in board:
board_representation.append(' '.join(row))
return board_representation
def print_chessboard(board):
for row in board:
print(' '.join(row))
class StockfishEngine:
def __init__(self, STOCKFISH_PATH):
self.process = subprocess.Popen(
STOCKFISH_PATH,
universal_newlines=True,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
)
self.set_stockfish_difficulty(STOCKFISH_DIFFICULTY)
def set_stockfish_difficulty(self, difficulty):
if difficulty == 1:
self.STOCKFISH_MOVETIME = 50
self.STOCKFISH_DEPTH = 5
self.STOCKFISH_SKILL = -9
elif difficulty == 2:
self.STOCKFISH_MOVETIME = 100
self.STOCKFISH_DEPTH = 5
self.STOCKFISH_SKILL = -5
elif difficulty == 3:
self.STOCKFISH_MOVETIME = 150
self.STOCKFISH_DEPTH = 5
self.STOCKFISH_SKILL = -1
elif difficulty == 4:
self.STOCKFISH_MOVETIME = 200
self.STOCKFISH_DEPTH = 5
self.STOCKFISH_SKILL = 3
elif difficulty == 5:
self.STOCKFISH_MOVETIME = 300
self.STOCKFISH_DEPTH = 5
self.STOCKFISH_SKILL = 7
elif difficulty == 6:
self.STOCKFISH_MOVETIME = 400
self.STOCKFISH_DEPTH = 8
self.STOCKFISH_SKILL = 11
elif difficulty == 7:
self.STOCKFISH_MOVETIME = 500
self.STOCKFISH_DEPTH = 13
self.STOCKFISH_SKILL = 16
elif difficulty == 8:
self.STOCKFISH_MOVETIME = 1000
self.STOCKFISH_DEPTH = 22
self.STOCKFISH_SKILL = 20
else:
raise ValueError("Invalid difficulty level. Must be between 1 and 8.")
print(f"Stockfish difficulty set to level {difficulty}")
print(f"Stockfish movetime set to {self.STOCKFISH_MOVETIME}")
print(f"Stockfish depth set to {self.STOCKFISH_DEPTH}")
print(f"Stockfish skill set to {self.STOCKFISH_SKILL}")
def send_command(self, command):
self.process.stdin.write(command + "\n")
self.process.stdin.flush()
def get_output(self, stop_strings):
if not self.process.stdout:
return ""
output = ""
while True:
line = self.process.stdout.readline().strip()
output += line + "\n"
if any(stop_string in line for stop_string in stop_strings):
break
return output
def start_new_game(self):
self.send_command("uci")
self.get_output(["uciok"])
self.send_command("ucinewgame")
self.send_command("isready")
self.get_output(["readyok"])
def make_move(self, moves):
self.send_command(f"position startpos moves {moves}")
self.send_command(f"go movetime {self.STOCKFISH_MOVETIME} depth {self.STOCKFISH_DEPTH} skill {self.STOCKFISH_SKILL}")
output = self.get_output(["bestmove"])
# Extract the best move from the output
best_move_line = next((line for line in output.split('\n') if line.startswith('bestmove')), None)
if best_move_line:
best_move = best_move_line.split(' ')[1]
else:
best_move = "No move found"
return best_move
def make_player_move(self, moves):
self.send_command(f"position startpos moves {moves}")
self.send_command("go movetime 100 depth 15 skill 10") # Adjust movetime as needed
output = self.get_output(["bestmove"])
# Extract the best move from the output
best_move_line = next((line for line in output.split('\n') if line.startswith('bestmove')), None)
if best_move_line:
best_move = best_move_line.split(' ')[1]
else:
best_move = "No move found"
return best_move
def move_legal(game_moves_array, realboard):
"""Check if a move/capture is legal."""
#start with checking what piece is being moved
#use chess library to check if the move is legal with the game moves array (a record of all the moves made so far)
# has the following format: [' ', 'e2e4', 'e7e5', 'g1f3', 'b8c6', 'f1c4', 'g8f6', 'e1g1', 'e8g8', etc...]
#if the move is legal, return True, else return False
# Initialize a chess board with the starting position
board = chess.Board() #TESTING USAGE OF CHESS LIBRARY, if it works, i'll use chess.board instead of RealBoard
# Also check if a castling move is being made, and check the relavent castling flags
# White's kingside castling: e1g1
# White's queenside castling: e1c1
# Black's kingside castling: e8g8
# Black's queenside castling: e8c8
# Replay the game moves except the last move
for move in game_moves_array[:-1]:
# Skip the first empty string in your array format
if move != ' ':
if realboard.white_castled == False:
if realboard.white_king_moved == True:
if move == 'e1g1' or move == 'e1c1':
print(f"Move {move} is illegal, can't perform castle because the king has moved.")
return False
# Checking the rook movement flags for white
if move == 'e1g1' and realboard.white_king_side_rook_moved == True: # Kingside castling
print("Move e1g1 is illegal, can't perform kingside castle because the kingside rook has moved.")
return False
if move == 'e1c1' and realboard.white_queen_side_rook_moved == True: # Queenside castling
print("Move e1c1 is illegal, can't perform queenside castle because the queenside rook has moved.")
return False
# Checking for pieces between the king and rook for white
if move == 'e1g1': # Kingside castling
if realboard.board[7][5] != '.' or realboard.board[7][6] != '.':
print("Move e1g1 is illegal, path is not clear for castling.")
return False
else: realboard.white_castled = True
if move == 'e1c1': # Queenside castling
if realboard.board[7][1] != '.' or realboard.board[7][2] != '.' or realboard.board[7][3] != '.':
print("Move e1c1 is illegal, path is not clear for castling.")
return False
else: realboard.white_castled = True
if realboard.black_castled == False:
if realboard.black_king_moved == True:
if move == 'e8g8' or move == 'e8c8':
print(f"Move {move} is illegal, can't perform castle because the king has moved.")
return False
# Checking the rook movement flags for black
if move == 'e8g8' and realboard.black_king_side_rook_moved == True: # Kingside castling
print("Move e8g8 is illegal, can't perform kingside castle because the kingside rook has moved.")
return False
if move == 'e8c8' and realboard.black_queen_side_rook_moved == True: # Queenside castling
print("Move e8c8 is illegal, can't perform queenside castle because the queenside rook has moved.")
return False
# Checking for pieces between the king and rook for black
if move == 'e8g8': # Kingside castling
if realboard.board[0][5] != '.' or realboard.board[0][6] != '.':
print("Move e8g8 is illegal, path is not clear for castling.")
return False
elsae: realboard.black_castled = True
if move == 'e8c8': # Queenside castling
if realboard.board[0][1] != '.' or realboard.board[0][2] != '.' or realboard.board[0][3] != '.':
print("Move e8c8 is illegal, path is not clear for castling.")
return False
else: realboard.black_castled = True
# Convert the move string to a move object
chess_move = chess.Move.from_uci(move)
# Check if the move is legal in the current board state
if chess_move in board.legal_moves:
# If the move is legal, apply it to the board
board.push(chess_move)
else:
# If any move is illegal, return False
print(f"Move {move} is illegal.")
return False
# Check the legality of the last move in the array
last_move = game_moves_array[-1]
if last_move != ' ' or last_move != '':
last_chess_move = chess.Move.from_uci(last_move)
if last_chess_move in board.legal_moves:
# The last move is legal
return True
else:
# The last move is illegal
return False
else:
# If the last move is an empty string, treat it as a pass
return True
def in_check(game_moves_array):
"""Check if the player is in check."""
# Initialize a chess board with the starting position
board = chess.Board() #TESTING USAGE OF CHESS LIBRARY, if it works, i'll use chess.board instead of RealBoard
# Replay the game moves
for move in game_moves_array[1:]:
# Skip the first empty string in your array format
if move != ' ':
# Convert the move string to a move object
chess_move = chess.Move.from_uci(move)
# Apply the move to the board
board.push(chess_move)
# Check if the current player is in check
if board.is_check():
return True
else:
return False
def in_checkmate(game_moves_array):
"""Check if the player is in checkmate."""
# Initialize a chess board with the starting position
board = chess.Board() #TESTING USAGE OF CHESS LIBRARY, if it works, i'll use chess.board instead of RealBoard
# Replay the game moves
for move in game_moves_array[1:]:
# Skip the first empty string in your array format
if move != ' ':
# Convert the move string to a move object
chess_move = chess.Move.from_uci(move)
# Apply the move to the board
board.push(chess_move)
# Check if the current player is in checkmate
if board.is_checkmate():
return True
else:
return False
def in_stalemate(game_moves_array):
"""Check if the player is in stalemate."""
# Initialize a chess board with the starting position
board = chess.Board() #TESTING USAGE OF CHESS LIBRARY, if it works, i'll use chess.board instead of RealBoard
# Replay the game moves
for move in game_moves_array[1:]:
# Skip the first empty string in your array format
if move != ' ':
# Convert the move string to a move object
chess_move = chess.Move.from_uci(move)
# Apply the move to the board
board.push(chess_move)
# Check if the current player is in stalemate
if board.is_stalemate():
return True
else:
return False
def in_draw(game_moves_array):
"""Check if the game is a draw."""
# Initialize a chess board with the starting position
board = chess.Board() #TESTING USAGE OF CHESS LIBRARY, if it works, i'll use chess.board instead of RealBoard
# Replay the game moves
for move in game_moves_array[1:]:
# Skip the first empty string in your array format
if move != ' ':
# Convert the move string to a move object
chess_move = chess.Move.from_uci(move)
# Apply the move to the board
board.push(chess_move)
# Check if the current game is a draw
if board.is_fivefold_repetition() or board.is_insufficient_material() or board.is_seventyfive_moves():
return True
else:
return False
def write_to_PGN(game_moves_array):
"""Write the game moves to a PGN file."""
# Create a new game
game = chess.pgn.Game()
node = game
# Add the moves to the game
for move in game_moves_array[1:]:
# Skip the first empty string in your array format
if move != ' ':
# Convert the move string to a move object
chess_move = chess.Move.from_uci(move)
# Add the move to the game
node = node.add_variation(chess_move)
# Write the game to a PGN file
with open("game.pgn", "w") as pgn_file:
pgn_file.write(str(game))
def simulate_move_with_stockfish(engine, game_moves_array):
stockfish_response = engine.make_player_move (' '.join(game_moves_array))
print(f"Stockfish suggests: {stockfish_response}")
return stockfish_response
def print_pretty_side_by_side(realboard, bitboard):
"""Print the real board and bitboard side by side."""
# Print the real board and bitboard side by side
rightzip = zip(realboard.get_pretty_board_representation())
leftzip = zip(bitboard.get_pretty_board_representation())
for leftrow, rightrow in zip(leftzip, rightzip):
print(leftrow[0] + " " + rightrow[0])
print()
def user_move(bitboard_current, move):
"""Prompt the user for a move and update the bitboard with the move."""
#parse the inputed move, should be in the form of "a2a4" or "a2 a4"
move = move.lower()
move = move.replace(" ", "")
move = move.replace("_", "")
bitboard_current.last_move_promotion = False
pattern = r'^[a-hA-H]\d[a-hA-H]\d$'
promotion_pattern = r'^[a-hA-H]\d[a-hA-H]\d[qQrRbBnN]$'
# Use the re.match function to check if the string matches the pattern
if re.match(pattern, move) or re.match(promotion_pattern, move):
print("Valid formatted move")
# Convert the move to bitboard numbers
#split 4 char move into 2 char from and to squares
from_square = move[:2]
to_square = move[2:]
from_position = RealBoard.square_to_bitboard_position(from_square)
to_position = RealBoard.square_to_bitboard_position(to_square)
#Handle castling moves
if from_square == 'e8' and to_square == 'g8':
#black kingside castle
# take current bitboard, clear the king and rook, and set the king and rook at the new positions
bitboard_current.clear_piece(4)
bitboard_current.clear_piece(7)
bitboard_current.set_piece(6)
bitboard_current.set_piece(5)
print(f"Black kingside castle, User Input move from {from_square} to {to_square}")
return bitboard_current
if from_square == 'e8' and to_square == 'c8':
#black queenside castle
# take current bitboard, clear the king and rook, and set the king and rook at the new positions
bitboard_current.clear_piece(4)
bitboard_current.clear_piece(0)
bitboard_current.set_piece(2)
bitboard_current.set_piece(3)
print(f"Black queenside castle, User Input move from {from_square} to {to_square}")
return bitboard_current
if from_square == 'e1' and to_square == 'g1':
#white kingside castle
# take current bitboard, clear the king and rook, and set the king and rook at the new positions
bitboard_current.clear_piece(60)
bitboard_current.clear_piece(63)
bitboard_current.set_piece(62)
bitboard_current.set_piece(61)
print(f"White kingside castle, User Input move from {from_square} to {to_square}")
return bitboard_current
if from_square == 'e1' and to_square == 'c1':
#white queenside castle
# take current bitboard, clear the king and rook, and set the king and rook at the new positions
bitboard_current.clear_piece(60)
bitboard_current.clear_piece(56)
bitboard_current.set_piece(58)
bitboard_current.set_piece(59)
print(f"White queenside castle, User Input move from {from_square} to {to_square}")
return bitboard_current
if from_position == to_position:
print(f"Invalid move, {from_square} and {to_square} are the same square!!!")
return -1
#check if from_position is occupied on the bitboard (it should be)
if not bitboard_current.is_occupied(from_position):
print(f"Invalid move, {from_square} has no piece on it to move!!!")
return -1
# #check if to_position is occupied on the bitboard
# if bitboard_current.is_occupied(to_position):
# print(f"Invalid move, {to_square} is occupied by another piece!!!")
# return -1
#commented out for now, was used before we had move legality checking
#print out the bitboard position numbers
print(f"User Input Move from {from_square} to {to_square} (from bitboard position {from_position} to bitboard position {to_position})")
if re.match(promotion_pattern, move):
print("Promotion move detected")
bitboard_current.last_move_promotion = move[4]
assert bitboard_current.last_move_promotion in ['q', 'r', 'b', 'n', 'Q', 'R', 'B', 'N']
else:
bitboard_current.last_move_promotion = 0
# if a capture is being made, need to simulate the creation of two bitboards, the first with the to square piece removed, and the second with the from square piece removed (from piece is now at the to_square, and the target piece is removed)
# these bitboards could be in either order when using actual sensors
# check if capture is being made
if bitboard_current.is_occupied(to_position):
print(f"Capture being made, Simulating capture input: removing piece from {to_square}")
bitboard_current.clear_piece(to_position)
capture_bitboards = [bitboard_current.copy(), bitboard_current.copy()]
capture_bitboards[1].clear_piece(from_position)
capture_bitboards[1].set_piece(to_position)
return capture_bitboards
else:
print("Invalid formatted move")
return -1
bitboard_current.clear_piece(from_position)
bitboard_current.set_piece(to_position)
return bitboard_current
def Game_Init():
bitboard = Bitboard()
bitboard.chessboard_setup()
realboard = RealBoard()
print_pretty_side_by_side(realboard, bitboard)
realboard.draw_board()
new_bitboard = bitboard.copy()
white_check = False
black_check = False
white_king_moved = False
white_king_side_rook_moved = False
white_queen_side_rook_moved = False
black_king_moved = False
black_king_side_rook_moved = False
black_queen_side_rook_moved = False
white_castled = False
black_castled = False
turn = 'white'
return bitboard, realboard, new_bitboard, white_check, black_check, white_king_moved, white_king_side_rook_moved, white_queen_side_rook_moved, black_king_moved, black_king_side_rook_moved, black_queen_side_rook_moved, white_castled, black_castled, turn
if __name__ == "__main__":
engine = StockfishEngine(STOCKFISH_PATH)
engine.start_new_game()
game_moves_array = [" "] # Array that stores the moves made in the game, in UCI format
bitboard, realboard, new_bitboard, white_check, black_check, white_king_moved, white_king_side_rook_moved, white_queen_side_rook_moved, black_king_moved, black_king_side_rook_moved, black_queen_side_rook_moved, white_castled, black_castled, turn = Game_Init()
realboard.draw_board(0, 0, 0, 0)
#Game start message (press space for confirmation)
print("Welcome to Chessbot! Press enter to start the game.")
# input()
#gameplay loop
while True:
turn = 'white'
if len(game_moves_array) % 2 == 0:
turn = 'black'
print(f"Turn: {turn}")
if AUTOMATED_TEST_MODE:
move = simulate_move_with_stockfish(engine, game_moves_array)
else:
move = input("Enter a move. (stand-in for moving a piece on Chessbot): ")
move = move.lower()
move = move.replace(" ", "")
move = move.replace("_", "")
new_bitboard = user_move(new_bitboard, move)
if new_bitboard == -1:
print("user_move returned -1, invalid move")
exit()
#if new_bitboard is an array, then a capture is being made, and we need to update the realboard with the capture
if isinstance(new_bitboard, list):
capture_bitboards = new_bitboard
realboard = realboard.capture_compare_update(bitboard, capture_bitboards[0], capture_bitboards[1])
new_bitboard = capture_bitboards[1]
else: #if new_bitboard is not an array, then a normal move is being made, and we need to update the realboard with the move
realboard = realboard.move_compare_update(bitboard, new_bitboard) #the realboard is updated with the move made, the piece moved is determined here as well
game_moves_array.append(realboard.last_move_made_UCI)
# print(game_moves_array)
if(move_legal(game_moves_array, realboard)):
print("Move is legal!")
else:
print("Move is illegal!")
exit()
if(in_stalemate(game_moves_array)):
print("Stalemate!")
gamestate = 'stalemate'
elif(in_draw(game_moves_array)):
print("Draw!")
gamestate = 'draw'
elif(in_check(game_moves_array)):
if turn == 'white':
print("Chessbot is in Check!")
gamestate = 'chessbot_checked'
if(in_checkmate(game_moves_array)):
print("Checkmate, Player Wins!")
gamestate = 'player_win'
else:
print("Player is in Check!")
gamestate = 'player_checked'
if(in_checkmate(game_moves_array)):
print("Checkmate, Chessbot Wins!")
gamestate = 'chessbot_win'
else:
gamestate = 0
player_last_piece = realboard.last_piece_moved
player_last_move = realboard.last_move_made_UCI
RealBoard.draw_board(realboard, player_last_piece, player_last_move, 0, 0)
if len(game_moves_array) >= 2:
write_to_PGN(game_moves_array)
if(gamestate == 'player_win' or gamestate == 'chessbot_win' or gamestate == 'stalemate' or gamestate == 'draw'):
print("Thanks for playing!")
exit()
print_pretty_side_by_side(realboard, new_bitboard)
turn = 'black'
stockfish_response = engine.make_move((' '.join(game_moves_array))) #get the best move from stockfish
print(f"Stockfish response: {stockfish_response}")
#turn stockfish response into a bitboard move and pass it through the user move function
# (not super necessary, but can be used to check against the sensors for accuracy)
# should just be able to update the realboard with the move suggested by stockfish (or received by lichess) and then move the piece on the irl board
move = stockfish_response
move = move.lower()
move = move.replace(" ", "")
move = move.replace("_", "")
bitboard = new_bitboard.copy()
new_bitboard = user_move(new_bitboard, move)
game_moves_array.append(move)
# print(game_moves_array)
if(move_legal(game_moves_array, realboard)):
print("Move is legal!")
else:
print("Move is illegal!")
exit()
if(in_stalemate(game_moves_array)):
print("Stalemate!")
gamestate = 'stalemate'
elif(in_draw(game_moves_array)):
print("Draw!")
gamestate = 'draw'
elif(in_check(game_moves_array)):
if turn == 'white':
print("Chessbot is in Check!")
gamestate = 'chessbot_checked'
if(in_checkmate(game_moves_array)):
print("Checkmate, Player Wins!")
gamestate = 'player_win'
else:
print("Player is in Check!")
gamestate = 'player_checked'
if(in_checkmate(game_moves_array)):
print("Checkmate, Chessbot Wins!")
gamestate = 'chessbot_win'
else:
gamestate = 0
if gamestate not in ['player_win', 'chessbot_win', 'stalemate', 'draw']:
if isinstance(new_bitboard, list):
capture_bitboards = new_bitboard
realboard = realboard.capture_compare_update(bitboard, capture_bitboards[0], capture_bitboards[1])
new_bitboard = capture_bitboards[1]
else: #if new_bitboard is not an array, then a normal move is being made, and we need to update the realboard with the move
realboard = realboard.move_compare_update(bitboard, new_bitboard)
print_pretty_side_by_side(realboard, new_bitboard)
realboard.draw_board(player_last_piece, player_last_move, realboard.last_piece_moved, realboard.last_move_made_UCI)
if len(game_moves_array) >= 2:
write_to_PGN(game_moves_array)
if(gamestate == 'player_win' or gamestate == 'chessbot_win' or gamestate == 'stalemate' or gamestate == 'draw'):
print("Thanks for playing!")
exit()
bitboard = new_bitboard.copy()
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