I wanted to ask if this project is valid to state on a resume for entry-level python developer and if the code is presentable to say a job interviewer.
github link: full project
(If this is not the place to ask this, I will remove above part of this post. By all means let me know)
The code needing most attention is a method(moves_safety_check()) in a match class checking the legality of the pseudo legal moves. Code doesn't have to change but I think the function is too long and over complicated, thus I would like tips for condensing the function with readability. Also, is the way i'm writing docstrings acceptable?
from chess.board import Board
from copy import deepcopy
from chess.moves import *
from chess.king_attacking_line import KingTargetingPseudoLine, DangerLines, SquaresTargeted
import json
all_ps_moves = ps_moves_per_loc() # dict with all board locations as keys and
# dictionaries as values having keys for each direction
# with a list of moves from that location in that
# direction as values.
class Match:
def __init__(self, state=Board().board, turn='white', wcks=True, wcqs=True, bcks=True, bcqs=True):
self.white_can_castle = {'ks': wcks, 'qs': wcqs}
self.black_can_castle = {'ks': bcks, 'qs': bcqs}
self.state = state
self.fen = convert_to_fen(self.state, turn, wcks, wcqs, bcks, bcqs)
self.black_pieces_locations = {}
self.white_pieces_locations = {}
self.board_locations_occupied_by_black = {}
self.board_locations_occupied_by_white = {}
self.ps_black_moves = {}
self.ps_white_moves = {}
self.black_moves = {}
self.white_moves = {}
self.set_piece_locations()
self.continuous_non_capped_turns = 0
try:
self.black_king_targeting_ps_lines = DangerLines(self.board_locations_occupied_by_black,
self.board_locations_occupied_by_white,
self.black_pieces_locations['K'])
self.white_king_targeting_ps_lines = DangerLines(self.board_locations_occupied_by_white,
self.board_locations_occupied_by_black,
self.white_pieces_locations['K'])
except KeyError:
for row in self.state:
print(row)
raise KeyError('King is not in board!')
self.king_attacking_line = []
self.white_non_iterative = SquaresTargeted() # keeps track of pseudo legal moves belonging to a pawn, knight or king.
self.black_non_iterative = SquaresTargeted()
self.b_check = False
self.w_check = False
self.turn = turn
self.king_attackers_locations = []
self.check_mate = False
self.winner = None
self.draw = False
self.moves_keys_history = {'wcc': deepcopy(self.white_can_castle), 'bcc': deepcopy(self.black_can_castle),
'keys': [], 'moves': [], 'state': self.state, 'fen': self.fen}
self.key = None
self.trace = []
self.set_all_ps_moves()
def is_in_black_ps_moves(self, move):
"""
Goes through black's pseudo moves and checks if given move is in the black's pseudo moves.
:param move: see if it is in black pseudo moves
:type move: tuple
:return: True if move is in black pseudo moves else False
:rtype: bool
"""
for key in self.ps_black_moves:
if 'Q' in key or 'B' in key or 'R' in key:
for direction in self.ps_black_moves[key]:
if move in self.ps_black_moves[key][direction]:
return True
return False
def is_in_white_ps_moves(self, move):
"""
Goes through white's pseudo moves and checks if given move is in the white's pseudo moves.
:param move: see if it is in white pseudo moves
:type move: tuple
:return: True if move is in white pseudo moves else False
:rtype: bool
"""
for key in self.ps_white_moves:
if 'Q' in key or 'B' in key or 'R' in key:
for direction in self.ps_white_moves[key]:
if move in self.ps_white_moves[key][direction]:
return True
return False
def legal_line(self, moves, color, per_mov=False, board=False):
"""
Returns legal moves.
:param moves: pseudo moves
:param color: side of pseudo moves given, must be 'black' or 'white'
:param per_mov: set to True if moves given are of a pawn king or knight
:param board: board to use check the moves given, default is self.state
:type moves: list
:type color: str
:type per_mov: bool
:type board: tuple
:return: legal moves
:rtype: list
"""
board = self.state if not board else board
new_moves = []
if color == 'white':
me, opp = 'w', 'b'
else:
me, opp = 'b', 'w'
if not per_mov:
for move in moves:
if me in str(board[move[0]][move[1]]):
moves = new_moves
return moves
elif opp in str(board[move[0]][move[1]]):
new_moves.append(move)
return new_moves
elif me not in str(board[move[0]][move[1]]):
new_moves.append(move)
else:
for move in moves:
if me not in str(board[move[0]][move[1]]):
new_moves.append(move)
return new_moves
def set_piece_locations(self):
"""
Called one time at initialisation, sets locations for pieces of both sides.
:return:
"""
for num in range(2):
pieces = {}
locations_occupied = {}
me = 'w' if num == 0 else 'b'
for i, row in enumerate(self.state):
for j, sq in enumerate(row):
if me in str(sq):
key = sq.replace(me, '')
pieces[key] = (i, j)
locations_occupied['({}, {})'.format(i, j)] = key
if num == 0:
self.white_pieces_locations = pieces
self.board_locations_occupied_by_white = locations_occupied
else:
self.black_pieces_locations = pieces
self.board_locations_occupied_by_black = locations_occupied
def get_king_targeting_lines(self, color, loc=False, get_direction=False):
"""
Returns the pieces and their lines that target the given location, also returns their direction at index 1*
if get_direction is set to True.
:param color: side who needs the targeting lines, must be 'white' or 'black'
:param loc: location to use as the target
:param get_direction: True if the direction key is also needed
:type color: str
:type loc: tuple
:type get_direction: bool
:return: a tuple of keys, directions*, lines that target the given location
:rtype: tuple
"""
if color == 'white':
ps_move_dict = self.ps_black_moves
if not loc:
king = self.white_pieces_locations['K']
else:
king = loc
else:
ps_move_dict = self.ps_white_moves
if not loc:
king = self.black_pieces_locations['K']
else:
king = loc
keys = []
directions = []
lines = []
for key in ps_move_dict:
if 'Q' in key or 'B' in key or 'R' in key:
for direction in ps_move_dict[key]:
if king in ps_move_dict[key][direction]:
if get_direction:
directions.append(direction)
keys.append(key)
lines.append(ps_move_dict[key][direction])
if get_direction:
return keys, directions, lines
else:
return keys, lines
def moves_safety_check(self, color):
# self.state is a tuple of 8 lists with length 8 as chess board.
# k_targeting_ps_lines is a list containing data of pieces(only queens, bishops or rooks) targeting the king
# with their pseudo legal moves.
#
# As an example say the black king is at position (3, 3) and a black pawn at (3, 4).
# If a rook or queen in this case is at position (3, 5) or (3, 6) or (3, 7), then that rook or queen is pseudo-
# targeting the king.
# if no piece is pseudo targeting the king when this method is called, then we don't have to check for any
# move except for the king's moves if that move would result in check.
# If however the king is targeted, then we check for each piece belonging to the side of aforementioned king if
# that piece is in a pseudo legal line targeting it's king. If so, we see if it would result in check if that
# piece moved to the location provided.
#
# If not in a pseudo legal line targeting the king, then we know it's safe for that piece to move since it's not
# protecting their king. Unless of course it's check, this means we only add moves which captures the piece
# having king in check or which would protect the king.
# The line targeting the king when it's check is self.king_attacking_line
"""
Checks if legal moves will cause check in which case the move is removed from legal moves.
:param color: side to have moves checked, either 'black' or 'white'
:type color: str
"""
def kings_move_is_dangerous():
"""
Is called if the move is in the opponent's pseudo moves.
If move would result in check, does not add to leg_moves.
"""
attackers, lines = self.get_king_targeting_lines(color, loc=move)
row = piece_locations[key][0]
col = piece_locations[key][1]
safe = True
for attacker, line in zip(attackers, lines):
sim_board = deepcopy(self.state)
sim_board[row][col] = 1
sim_board[move[0]][move[1]] = me + key
if move[1] == col - 3:
sim_board[row][0] = 1
sim_board[row][2] = me + 'R1'
elif move[1] == col + 2:
sim_board[row][7] = 1
sim_board[row][5] = me + 'R2'
if move in self.legal_line(line, opp_color, board=sim_board):
safe = False
break
if safe:
safe_moves.append(move)
if color == 'white':
move_dict = self.white_moves
k_targeting_ps_lines = self.white_king_targeting_ps_lines
opp_non_iter_moves = self.black_non_iterative
is_in_opp_moves = self.is_in_black_ps_moves
opp, me = 'b', 'w'
opp_color = 'black'
check = self.w_check
piece_locations = self.white_pieces_locations
pawn_one_step_two_steps, start_row = (-1, -2), 6
else:
move_dict = self.black_moves
k_targeting_ps_lines = self.black_king_targeting_ps_lines
opp_non_iter_moves = self.white_non_iterative
is_in_opp_moves = self.is_in_white_ps_moves
opp, me = 'w', 'b'
opp_color = 'white'
check = self.b_check
piece_locations = self.black_pieces_locations
pawn_one_step_two_steps, start_row = (1, 2), 1
for key in move_dict:
if 'Q' in key or 'R' in key or 'B' in key:
if check:
if len(self.king_attackers_locations) > 1:
move_dict[key] = None
continue
if k_targeting_ps_lines.is_targeted(piece_locations[key]):
for direction in move_dict[key]:
safe_moves = []
for move in move_dict[key][direction]:
if k_targeting_ps_lines.would_be_check(piece_locations[key], move, already_check=check):
break
elif move in self.king_attacking_line or move in self.king_attackers_locations:
safe_moves.append(move)
move_dict[key][direction] = safe_moves
else:
for direction in move_dict[key]:
safe_moves = []
for move in move_dict[key][direction]:
if move in self.king_attacking_line or move in self.king_attackers_locations:
safe_moves.append(move)
move_dict[key][direction] = safe_moves
elif k_targeting_ps_lines:
if k_targeting_ps_lines.is_targeted(piece_locations[key]):
for direction in move_dict[key]:
safe_moves = []
for move in move_dict[key][direction]:
if k_targeting_ps_lines.would_be_check(piece_locations[key], move):
break
safe_moves.append(move)
move_dict[key][direction] = safe_moves
bad_directions = []
for direction in move_dict[key]:
if not move_dict[key][direction]:
bad_directions.append(direction)
for direction in bad_directions:
del move_dict[key][direction]
elif 'N' in key:
if not move_dict[key]:
continue
if check:
if len(self.king_attackers_locations) > 1:
move_dict[key] = None
continue
if k_targeting_ps_lines.is_targeted(piece_locations[key]):
if k_targeting_ps_lines.would_be_check(piece_locations[key],
move_dict[key][0],
already_check=check):
move_dict[key] = None
continue
safe_moves = []
for move in move_dict[key]:
if move in self.king_attacking_line or move in self.king_attackers_locations:
safe_moves.append(move)
move_dict[key] = safe_moves if safe_moves else None
continue
else:
safe_moves = []
for move in move_dict[key]:
if move in self.king_attacking_line or move in self.king_attackers_locations:
safe_moves.append(move)
move_dict[key] = safe_moves if safe_moves else None
continue
elif k_targeting_ps_lines:
if k_targeting_ps_lines.is_targeted(piece_locations[key]):
if k_targeting_ps_lines.would_be_check(piece_locations[key], move_dict[key][0]):
move_dict[key] = None
continue
elif 'P' in key:
if piece_locations[key][0] + pawn_one_step_two_steps[0] not in range(8):
move_dict[key] = None
continue
one_step = (piece_locations[key][0] + pawn_one_step_two_steps[0], piece_locations[key][1])
safe_moves = []
if check:
if len(self.king_attackers_locations) > 1:
move_dict[key] = None
continue
danger = False
if k_targeting_ps_lines.is_targeted(piece_locations[key]):
danger = True
for move in move_dict[key]:
if k_targeting_ps_lines.would_be_check(piece_locations[key], move, already_check=check):
continue
if move in self.king_attackers_locations:
safe_moves.append(move)
else:
for move in move_dict[key]:
if move in self.king_attackers_locations:
safe_moves.append(move)
if danger:
if str(self.state[one_step[0]][one_step[1]]) == '1':
if k_targeting_ps_lines.would_be_check(piece_locations[key], one_step):
move_dict[key] = safe_moves if safe_moves else None
continue
if one_step in self.king_attacking_line:
safe_moves.append(one_step)
if piece_locations[key][0] == start_row:
two_steps = (piece_locations[key][0] + pawn_one_step_two_steps[1], piece_locations[key][1])
if str(self.state[two_steps[0]][two_steps[1]]) == '1':
if two_steps in self.king_attacking_line:
safe_moves.append(two_steps)
else:
if str(self.state[one_step[0]][one_step[1]]) == '1':
if one_step in self.king_attacking_line:
safe_moves.append(one_step)
if piece_locations[key][0] == start_row:
two_steps = (piece_locations[key][0] + pawn_one_step_two_steps[1],
piece_locations[key][1])
if str(self.state[two_steps[0]][two_steps[1]]) == '1':
if two_steps in self.king_attacking_line:
safe_moves.append(two_steps)
elif k_targeting_ps_lines:
danger = False
if k_targeting_ps_lines.is_targeted(piece_locations[key]):
danger = True
for move in move_dict[key]:
if k_targeting_ps_lines.would_be_check(piece_locations[key], move):
continue
else:
if opp in str(self.state[move[0]][move[1]]):
safe_moves.append(move)
else:
for move in move_dict[key]:
if opp in str(self.state[move[0]][move[1]]):
safe_moves.append(move)
if str(self.state[one_step[0]][one_step[1]]) == '1':
if danger:
if k_targeting_ps_lines.would_be_check(piece_locations[key], one_step):
move_dict[key] = safe_moves if safe_moves else None
continue
else:
safe_moves.append(one_step)
if piece_locations[key][0] == start_row:
two_steps = (piece_locations[key][0] + pawn_one_step_two_steps[1],
piece_locations[key][1])
if str(self.state[two_steps[0]][two_steps[1]]) == '1':
safe_moves.append(two_steps)
else:
safe_moves.append(one_step)
if piece_locations[key][0] == start_row:
two_steps = (piece_locations[key][0] + pawn_one_step_two_steps[1],
piece_locations[key][1])
if str(self.state[two_steps[0]][two_steps[1]]) == '1':
safe_moves.append(two_steps)
else:
for move in move_dict[key]:
if opp in str(self.state[move[0]][move[1]]):
safe_moves.append(move)
if str(self.state[one_step[0]][one_step[1]]) == '1':
safe_moves.append(one_step)
if piece_locations[key][0] == start_row:
two_steps = (piece_locations[key][0] + pawn_one_step_two_steps[1], piece_locations[key][1])
if str(self.state[two_steps[0]][two_steps[1]]) == '1':
safe_moves.append(two_steps)
move_dict[key] = safe_moves if safe_moves else None
else:
safe_moves = []
if check:
for move in move_dict[key]:
if move in self.king_attacking_line or move in opp_non_iter_moves.move_set:
continue
elif is_in_opp_moves(move):
kings_move_is_dangerous()
else:
safe_moves.append(move)
move_dict[key] = safe_moves if safe_moves else None
else:
for move in move_dict[key]:
if move in opp_non_iter_moves.move_set:
continue
elif is_in_opp_moves(move):
kings_move_is_dangerous()
else:
safe_moves.append(move)
move_dict[key] = safe_moves
keys_to_del = []
for key in move_dict:
if not move_dict[key]:
keys_to_del.append(key)
for key in keys_to_del:
del move_dict[key]
if not move_dict:
self.check_mate = True
self.winner = 'black' if color == 'white' else 'white'
def set_all_ps_moves(self):
"""
Is called one time at initialisation, sets all the pseudo-legal moves for both sides.
"""
for key in self.white_pieces_locations:
if 'Q' in key or 'R' in key or 'B' in key:
self.ps_white_moves[key] = {}
self.update_ps_iterative_moves(key, 'white')
elif 'P' in key or 'N' in key:
self.update_ps_non_iterative_moves(key, 'white')
else:
self.update_king_moves('white')
for key in self.black_pieces_locations:
if 'Q' in key or 'R' in key or 'B' in key:
self.ps_black_moves[key] = {}
self.update_ps_iterative_moves(key, 'black')
elif 'P' in key or 'N' in key:
self.update_ps_non_iterative_moves(key, 'black')
else:
self.update_king_moves('black')
if self.turn == 'white':
self.moves_safety_check(color='black')
self.moves_safety_check(color='white')
else:
self.moves_safety_check(color='white')
self.moves_safety_check(color='black')
def check_or_king_ps_targeted(self, key, loc, color):
"""
Checks if it is check or if the opponent's king is targeted by the pseudo moves of the given piece.
:param key: piece, cannot be a pawn, knight or king
:param loc: location of given key
:param color: side of given key must be 'black' or 'white'
:type key: str
:type loc: tuple
:type color: str
"""
if color == 'white':
try:
king_loc = self.black_pieces_locations['K']
except KeyError:
self.save_game(fn='king_loc_key_error.json')
raise
opp_k_targeting_ps_lines = self.black_king_targeting_ps_lines
move_dict = self.white_moves
ps_move_dict = self.ps_white_moves
else:
try:
king_loc = self.white_pieces_locations['K']
except KeyError:
self.save_game(fn='king_loc_key_error.json')
raise
opp_k_targeting_ps_lines = self.white_king_targeting_ps_lines
move_dict = self.black_moves
ps_move_dict = self.ps_black_moves
ps_moves = []
for direction in ps_move_dict[key]:
ps_moves.append(ps_move_dict[key][direction])
if 'Q' in key:
directions = ('tr', 'tl', 'br', 'bl', 'u', 'd', 'r', 'l')
elif 'R' in key:
directions = ('u', 'd', 'r', 'l')
else:
directions = ('tr', 'tl', 'br', 'bl')
if len(ps_moves) == 4:
leg_moves = (self.legal_line(ps_moves[0], color), self.legal_line(ps_moves[1], color),
self.legal_line(ps_moves[2], color), self.legal_line(ps_moves[3], color))
else:
leg_moves = (self.legal_line(ps_moves[0], color), self.legal_line(ps_moves[1], color),
self.legal_line(ps_moves[2], color), self.legal_line(ps_moves[3], color),
self.legal_line(ps_moves[4], color), self.legal_line(ps_moves[5], color),
self.legal_line(ps_moves[6], color), self.legal_line(ps_moves[7], color))
move_dict[key] = {}
for index, direction in enumerate(directions):
if leg_moves[index]:
move_dict[key][direction] = leg_moves[index]
i = 0
for ps_line, leg_line in zip(ps_moves, leg_moves):
if king_loc in ps_line:
opp_k_targeting_ps_lines.append_x(KingTargetingPseudoLine(key, loc, directions[i], ps_line))
if king_loc in leg_line:
self.king_attackers_locations.append(loc)
self.king_attacking_line.extend(leg_line)
self.w_check = True if color == 'black' else self.w_check
self.b_check = True if color == 'white' else self.b_check
i += 1
def update_legal_iterative_moves(self, key, color):
"""
This sets the reachable squares a.k.a legal moves. ps_moves must already be set!
:param key: piece to have legal moves updated, cannot be a pawn, knight or king
:param color: side of the piece, must be 'black' or 'white'
:type key: str
:type color: str
"""
ps_move_dict = self.ps_white_moves if color == 'white' else self.ps_black_moves
leg_move_dict = self.white_moves if color == 'white' else self.black_moves
leg_move_dict[key] = {}
if 'Q' in key:
tr, tl = ps_move_dict[key]['tr'], ps_move_dict[key]['tl']
br, bl = ps_move_dict[key]['br'], ps_move_dict[key]['bl']
u, d = ps_move_dict[key]['u'], ps_move_dict[key]['d']
r, l = ps_move_dict[key]['r'], ps_move_dict[key]['l']
leg_move_dict[key]['tr'], leg_move_dict[key]['tl'] = self.legal_line(tr, color), self.legal_line(tl, color)
leg_move_dict[key]['br'], leg_move_dict[key]['bl'] = self.legal_line(br, color), self.legal_line(bl, color)
leg_move_dict[key]['u'], leg_move_dict[key]['d'] = self.legal_line(u, color), self.legal_line(d, color)
leg_move_dict[key]['r'], leg_move_dict[key]['l'] = self.legal_line(r, color), self.legal_line(l, color)
elif 'B' in key:
tr, tl = ps_move_dict[key]['tr'], ps_move_dict[key]['tl']
br, bl = ps_move_dict[key]['br'], ps_move_dict[key]['bl']
leg_move_dict[key]['tr'], leg_move_dict[key]['tl'] = self.legal_line(tr, color), self.legal_line(tl, color)
leg_move_dict[key]['br'], leg_move_dict[key]['bl'] = self.legal_line(br, color), self.legal_line(bl, color)
else:
u, d = ps_move_dict[key]['u'], ps_move_dict[key]['d']
r, l = ps_move_dict[key]['r'], ps_move_dict[key]['l']
leg_move_dict[key]['u'], leg_move_dict[key]['d'] = self.legal_line(u, color), self.legal_line(d, color)
leg_move_dict[key]['r'], leg_move_dict[key]['l'] = self.legal_line(r, color), self.legal_line(l, color)
def update_ps_iterative_moves(self, key, color):
"""
This sets the pseudo legal lines.
:param key: piece to have pseudo legal moves updated, cannot be a pawn, knight or king
:param color: side of the piece, must be 'black' or 'white'
:type key: str
:type color: str
"""
loc = self.white_pieces_locations[key] if color == 'white' else self.black_pieces_locations[key]
ps_move_dict = self.ps_white_moves if color == 'white' else self.ps_black_moves
ps_move_dict[key] = {}
pmk = str(loc)
if 'Q' in key:
ps_move_dict[key]['tr'], ps_move_dict[key]['tl'] = all_ps_moves[pmk]['tr'], all_ps_moves[pmk]['tl']
ps_move_dict[key]['br'], ps_move_dict[key]['bl'] = all_ps_moves[pmk]['br'], all_ps_moves[pmk]['bl']
ps_move_dict[key]['u'], ps_move_dict[key]['d'] = all_ps_moves[pmk]['u'], all_ps_moves[pmk]['d']
ps_move_dict[key]['r'], ps_move_dict[key]['l'] = all_ps_moves[pmk]['r'], all_ps_moves[pmk]['l']
elif 'B' in key:
ps_move_dict[key]['tr'], ps_move_dict[key]['tl'] = all_ps_moves[pmk]['tr'], all_ps_moves[pmk]['tl']
ps_move_dict[key]['br'], ps_move_dict[key]['bl'] = all_ps_moves[pmk]['br'], all_ps_moves[pmk]['bl']
else:
ps_move_dict[key]['u'], ps_move_dict[key]['d'] = all_ps_moves[pmk]['u'], all_ps_moves[pmk]['d']
ps_move_dict[key]['r'], ps_move_dict[key]['l'] = all_ps_moves[pmk]['r'], all_ps_moves[pmk]['l']
self.check_or_king_ps_targeted(key, loc, color)
def update_legal_non_iterative_moves(self, key, color):
"""
This sets the legal moves. ps_moves must already be set!
:param key: piece to have legal moves updated, must be a pawn, knight or king
:param color: side of the piece, must be 'black' or 'white'
:type key: str
:type color: str
"""
if key == 'K':
self.update_king_moves(color)
return
moves = self.ps_white_moves[key] if color == 'white' else self.ps_black_moves[key]
leg_move_dict = self.white_moves if color == 'white' else self.black_moves
leg_move_dict[key] = self.legal_line(moves, color, per_mov=True)
def update_ps_non_iterative_moves(self, key, color):
"""
This sets pseudo legal moves.
:param key: piece to have legal moves updated, must be a pawn, knight or king
:param color: side of the piece, must be 'black' or 'white'
:type key: str
:type color: str
"""
if color == 'white':
loc = self.white_pieces_locations[key]
try:
king_loc = self.black_pieces_locations['K']
except KeyError:
self.save_game(fn='king_loc_non_it.json')
raise
ps_moves = self.ps_white_moves
move_dict = self.white_moves
non_it_moves = self.white_non_iterative
else:
loc = self.black_pieces_locations[key]
try:
king_loc = self.white_pieces_locations['K']
except KeyError:
self.save_game(fn='king_loc_non_it.json')
raise
ps_moves = self.ps_black_moves
move_dict = self.black_moves
non_it_moves = self.black_non_iterative
if 'P' in key:
moves = ps_pawn_cap_moves(loc, color)
else:
moves = ps_knight_moves(loc)
non_it_moves.assign(key, moves)
ps_moves[key] = moves
leg_moves = self.legal_line(moves, color, per_mov=True)
move_dict[key] = leg_moves
if king_loc in moves:
if color == 'white':
self.b_check = True
else:
self.w_check = True
self.king_attackers_locations.append(loc)
def king_moved(self, color):
"""
Updates king_targeting_ps_lines of the side whose king moved.
:param color: side whose king moved, must be 'black' or 'white'
:type color: str
"""
if color == 'white':
loc = self.white_pieces_locations['K']
is_in_opp_moves = self.is_in_black_ps_moves
danger_lines = self.white_king_targeting_ps_lines
opp_pieces = self.black_pieces_locations
else:
loc = self.black_pieces_locations['K']
is_in_opp_moves = self.is_in_white_ps_moves
danger_lines = self.black_king_targeting_ps_lines
opp_pieces = self.white_pieces_locations
danger_lines.king_moved(loc)
if is_in_opp_moves(loc):
keys, dirs, lines = self.get_king_targeting_lines(color, loc=loc, get_direction=True)
for key, direction, line in zip(keys, dirs, lines):
if key in danger_lines.keys:
continue
attacker_loc = opp_pieces[key]
danger_lines.append_x(KingTargetingPseudoLine(key, attacker_loc, direction, line))
def update_king_moves(self, color):
"""
Updates moves for given color's king, checks if can castle.
:param color: side of king to have moves updated
"""
if color == 'white':
loc = self.white_pieces_locations['K']
can_castle = self.white_can_castle
ps_moves = self.ps_white_moves
move_dict, pieces = self.white_moves, self.white_pieces_locations
non_it_moves = self.white_non_iterative
else:
loc = self.black_pieces_locations['K']
can_castle = self.black_can_castle
ps_moves = self.ps_black_moves
move_dict, pieces = self.black_moves, self.black_pieces_locations
non_it_moves = self.black_non_iterative
moves = ps_king_moves(loc, color)
ps_moves['K'] = moves
non_it_moves.assign('K', moves)
leg_moves = self.legal_line(moves, color, per_mov=True)
if can_castle['ks']:
ps_moves['K'].append((pieces['K'][0], 6))
for col in range(5, 7):
if self.state[pieces['K'][0]][col] != 1:
break
if col == 6:
leg_moves.append((pieces['K'][0], 6))
if can_castle['qs']:
ps_moves['K'].append((pieces['K'][0], 1))
for col in range(3, 0, -1):
if self.state[pieces['K'][0]][col] != 1:
break
if col == 1:
leg_moves.append((pieces['K'][0], 1))
move_dict['K'] = None
if leg_moves:
move_dict['K'] = leg_moves
else:
del move_dict['K']
def update_logs(self, key, move, old_loc, castled):
"""
Updates classes whose definitions are located in king_attacking_line.py.
These check if certain moves are allowed and won't cause check.
Also checks if pawns reached the final rank.
:param key: last moved piece
:param move: last move made
:param old_loc: old location of last moved piece
:param castled: did a king castle, only True if piece is king
"""
if self.turn == 'white':
opp_k_targeting_ps_lines, opp_non_iter_moves = self.black_king_targeting_ps_lines, self.black_non_iterative
pieces_locations, inv_pieces = self.white_pieces_locations, self.board_locations_occupied_by_white
ps_moves, moves = self.ps_white_moves, self.white_moves
pawn_edge_row = 0
can_castle = self.white_can_castle
else:
opp_k_targeting_ps_lines, opp_non_iter_moves = self.white_king_targeting_ps_lines, self.white_non_iterative
pieces_locations, inv_pieces = self.black_pieces_locations, self.board_locations_occupied_by_black
ps_moves, moves = self.ps_black_moves, self.black_moves
pawn_edge_row = 7
can_castle = self.black_can_castle
if key == 'R1':
can_castle['qs'] = False
elif key == 'R2':
can_castle['ks'] = False
elif key == 'K':
can_castle['ks'], can_castle['qs'] = False, False
if castled:
if move[1] == 1:
pieces_locations['R1'] = (move[0], 2)
inv_pieces[str((move[0], 2))] = 'R1'
try:
del inv_pieces[str((move[0], 0))]
except KeyError:
self.save_game(fn='castled_r1_.json')
raise KeyError("couldn't delete old location of R1")
opp_k_targeting_ps_lines.delete_line('R1')
self.update_ps_iterative_moves('R1', self.turn)
elif move[1] == 6:
pieces_locations['R2'] = (move[0], 5)
inv_pieces[str((move[0], 5))] = 'R2'
try:
del inv_pieces[str((move[0], 7))]
except KeyError:
self.save_game(fn='castled_r2_.json')
raise KeyError("couldn't delete old location of R2")
opp_k_targeting_ps_lines.delete_line('R2')
self.update_ps_iterative_moves('R2', self.turn)
else:
raise ValueError('Castled was passed as true but the move is not a legal castle move.')
elif 'P' in key and move[0] == pawn_edge_row:
non_it_moves = self.white_non_iterative if self.turn == 'white' else self.black_non_iterative
non_it_moves.piece_died(key)
del pieces_locations[key], ps_moves[key], moves[key]
self.key = 'Q' + key[1]
key = self.key
ps_moves[key] = {}
self.state[move[0]][move[1]] = self.turn[0] + key
pieces_locations[key] = move
inv_pieces[str(move)] = key
try:
del inv_pieces[str(old_loc)]
except KeyError:
self.save_game(fn='del_inv_pieces.json')
raise
if opp_k_targeting_ps_lines.is_king_attacker(key):
opp_k_targeting_ps_lines.delete_line(key)
if opp_k_targeting_ps_lines.is_targeted(old_loc):
def is_check():
attacker = opp_k_targeting_ps_lines.get_attacker()
self.king_attackers_locations.append(attacker[0])
try:
att_key = inv_pieces[str(attacker[0])]
except KeyError:
print(opp_k_targeting_ps_lines.keys)
self.save_game(fn='att_key_error.json')
raise KeyError('Something went wrong!')
ps_line = ps_moves[att_key][attacker[1]]
self.king_attacking_line.extend(self.legal_line(ps_line, self.turn))
if self.turn == 'white':
self.b_check = opp_k_targeting_ps_lines.will_be_check(old_loc)
if self.b_check:
is_check()
else:
self.w_check = opp_k_targeting_ps_lines.will_be_check(old_loc)
if self.w_check:
is_check()
def is_piece_capped(self, move):
"""
Checks if a piece was captured, and updates data in response.
:param move: last move made
"""
if self.turn == 'white':
danger_lines = self.white_king_targeting_ps_lines
opp_ps_moves, opp_moves, opp_non_it_moves = self.ps_black_moves, self.black_moves, self.black_non_iterative
opp_pieces, opp_inv_pieces = self.black_pieces_locations, self.board_locations_occupied_by_black
opp_can_castle = self.black_can_castle
else:
danger_lines = self.black_king_targeting_ps_lines
opp_ps_moves, opp_moves, opp_non_it_moves = self.ps_white_moves, self.white_moves, self.white_non_iterative
opp_pieces, opp_inv_pieces = self.white_pieces_locations, self.board_locations_occupied_by_white
opp_can_castle = self.white_can_castle
if self.state[move[0]][move[1]] != 1:
self.continuous_non_capped_turns = 0
capped = self.state[move[0]][move[1]][1:]
if 'P' not in capped and 'N' not in capped:
if 'R1' in capped:
opp_can_castle['qs'] = False
elif 'R2' in capped:
opp_can_castle['ks'] = False
if danger_lines.is_king_attacker(capped):
danger_lines.delete_line(capped)
else:
opp_non_it_moves.piece_died(capped)
try:
del opp_pieces[capped], opp_ps_moves[capped], opp_inv_pieces[str(move)], opp_moves[capped]
except KeyError:
if capped not in opp_moves.keys() or capped not in opp_ps_moves.keys():
pass
else:
self.save_game(fn='del_key_error_301.json')
raise
else:
self.continuous_non_capped_turns += 1
def save_game(self, fn='match.json'):
"""
Saves full match in match.json with starting board, all moves made including the pieces and
whether black and white could castle.
loading a file with data for a match can be played using rerun_game(fn=fn).
:param fn: default is match.json, file to have match stored in
:type fn: str
"""
with open(fn, 'w') as f:
json.dump(self.moves_keys_history, f, indent=1)
def make_move(self, move, key):
"""
Places piece in new location and updates data:
self.is_piece_capped(...),
self.update_logs(...)
and updates moves for pieces needing it.
:param move: move to be made
:param key: piece to move
:type move: tuple
:type key: str
"""
self.key = key
self.moves_keys_history['keys'].append(key)
self.moves_keys_history['moves'].append(move)
if self.turn == 'white':
ps_moves, pieces_locations = self.ps_white_moves, self.white_pieces_locations
opp_ps_moves = self.ps_black_moves
old_loc = pieces_locations[self.key]
opp = 'black'
else:
ps_moves, pieces_locations = self.ps_black_moves, self.black_pieces_locations
opp_ps_moves = self.ps_white_moves
old_loc = pieces_locations[self.key]
opp = 'white'
self.is_piece_capped(move)
if self.continuous_non_capped_turns == 50:
self.draw, self.winner = True, None
return
piece = self.state[old_loc[0]][old_loc[1]]
self.state[old_loc[0]][old_loc[1]] = 1
self.state[move[0]][move[1]] = piece
castled = False
if self.key == 'K':
if move[1] == pieces_locations[self.key][1] - 3:
castled = True
rook1, self.state[move[0]][0] = self.state[move[0]][0], 1
self.state[move[0]][2] = rook1
elif move[1] == pieces_locations[self.key][1] + 2:
castled = True
rook2, self.state[move[0]][7] = self.state[move[0]][7], 1
self.state[move[0]][5] = rook2
self.update_logs(self.key, move, old_loc, castled)
def update_moves(_key, _color):
if 'P' not in _key and 'N' not in _key and 'K' not in _key:
self.update_ps_iterative_moves(_key, _color)
elif 'K' not in _key:
self.update_ps_non_iterative_moves(_key, _color)
else:
if self.key == 'K':
self.king_moved(_color)
self.update_king_moves(_color)
def update_legal_moves(_key, _color):
if 'P' not in _key and 'N' not in _key and 'K' not in _key:
self.update_legal_iterative_moves(_key, _color)
else:
self.update_legal_non_iterative_moves(_key, _color)
for key_2 in ps_moves:
if key_2 == self.key:
update_moves(key_2, self.turn)
continue
update_legal_moves(key_2, self.turn)
for key_2 in opp_ps_moves:
update_legal_moves(key_2, opp)
self.moves_safety_check(opp)
if len(self.black_pieces_locations) == 1 and len(self.white_pieces_locations) == 1:
self.draw = True
self.winner = None
self.turn = 'black' if self.turn == 'white' else 'white'
self.w_check = False
self.b_check = False
self.king_attackers_locations = []
self.king_attacking_line = []
This class is by far the largest, I'm not sure how to make this understandable. Feel free to dive in all the relevant code at the link above.
self.state,self.get_king_targeting_lines,self.white_moves,self.white_king_targeting_ps_lines,self.black_non_iterative,self.is_in_black_ps_moves,self.w_check...) \$\endgroup\$ – Graipher Mar 9 at 8:34