def applyFen(self, fenstr):
""" Applies the fenstring to the board.
If the string is not properly
written a SyntaxError will be raised, having its message ending in
Pos(%d) specifying the string index of the problem.
if an error is found, no changes will be made to the board. """
assert not self.fen_was_applied, "The applyFen() method can be used on new LBoard objects only!"
# Set board to empty on Black's turn (which Polyglot-hashes to 0)
self.blocker = 0
self.friends = [0, 0]
self.kings = [-1, -1]
self.boards = ([0] * 7, [0] * 7)
self.enpassant = None # cord which can be captured by enpassant or None
self.color = BLACK
self.castling = 0 # The castling availability in the position
self.hasCastled = [False, False]
self.fifty = 0 # A ply counter for the fifty moves rule
self.plyCount = 0
self.checked = None
self.opchecked = None
self.arBoard = [0] * 64
self.hash = 0
self.pawnhash = 0
# Data from the position's history:
self.hist_move = [] # The move that was applied to get the position
self.hist_tpiece = []
# The piece the move captured, == EMPTY for normal moves
self.hist_enpassant = []
self.hist_castling = []
self.hist_hash = []
self.hist_fifty = []
self.hist_checked = []
self.hist_opchecked = []
# piece counts
self.pieceCount = ([0] * 7, [0] * 7)
# initial cords of rooks and kings for castling in Chess960
if self.variant == FISCHERRANDOMCHESS:
self.ini_kings = [None, None]
self.ini_rooks = ([None, None], [None, None])
elif self.variant in (WILDCASTLECHESS, WILDCASTLESHUFFLECHESS):
self.ini_kings = [None, None]
self.fin_kings = ([None, None], [None, None])
self.fin_rooks = ([None, None], [None, None])
elif self.variant in DROP_VARIANTS:
self.iniHouse()
elif self.variant == ATOMICCHESS:
self.iniAtomic()
elif self.variant == CAMBODIANCHESS:
self.iniCambodian()
# Get information
parts = fenstr.split()
castChr = "-"
epChr = "-"
fiftyChr = "0"
moveNoChr = "1"
if STRICT_FEN and len(parts) != 6:
raise SyntaxError(_("FEN needs 6 data fields. \n\n%s") % fenstr)
elif len(parts) < 2:
raise SyntaxError(
_("FEN needs at least 2 data fields in fenstr. \n\n%s") %
fenstr)
elif len(parts) >= 6:
pieceChrs, colChr, castChr, epChr, fiftyChr, moveNoChr = parts[:6]
elif len(parts) == 5:
pieceChrs, colChr, castChr, epChr, fiftyChr = parts
elif len(parts) == 4:
if parts[2].isdigit() and parts[3].isdigit():
# xboard FEN usage for asian variants
pieceChrs, colChr, fiftyChr, moveNoChr = parts
else:
pieceChrs, colChr, castChr, epChr = parts
elif len(parts) == 3:
pieceChrs, colChr, castChr = parts
else:
pieceChrs, colChr = parts
# Try to validate some information
# TODO: This should be expanded and perhaps moved
slashes = pieceChrs.count("/")
if slashes < 7:
raise SyntaxError(
_("Needs 7 slashes in piece placement field. \n\n%s") % fenstr)
if not colChr.lower() in ("w", "b"):
raise SyntaxError(
_("Active color field must be one of w or b. \n\n%s") % fenstr)
if castChr != "-":
for Chr in castChr:
valid_chars = "ABCDEFGHKQ" if self.variant == FISCHERRANDOMCHESS else "KQ"
if Chr.upper() not in valid_chars:
if self.variant == CAMBODIANCHESS:
pass
# sjaakii uses DEde in cambodian starting fen to indicate
# that queens and kings are virgins (not moved yet)
else:
raise SyntaxError(
_("Castling availability field is not legal. \n\n%s"
) % fenstr)
if epChr != "-" and epChr not in cordDic:
raise SyntaxError(
_("En passant cord is not legal. \n\n%s") % fenstr)
# Parse piece placement field
promoted = False
# if there is a holding within [] we change it to BFEN style first
if pieceChrs.endswith("]"):
pieceChrs = pieceChrs[:-1].replace("[", "/")
for r, rank in enumerate(pieceChrs.split("/")):
cord = (7 - r) * 8
for char in rank:
if r > 7:
# After the 8.rank BFEN can contain holdings (captured pieces)
# "~" after a piece letter denotes promoted piece
if r == 8 and self.variant in DROP_VARIANTS:
color = char.islower() and BLACK or WHITE
piece = chrU2Sign[char.upper()]
self.holding[color][piece] += 1
self.hash ^= holdingHash[color][piece][
self.holding[color][piece]]
continue
else:
break
if char.isdigit():
cord += int(char)
elif char == "~":
promoted = True
else:
color = char.islower() and BLACK or WHITE
piece = chrU2Sign[char.upper()]
self._addPiece(cord, piece, color)
self.pieceCount[color][piece] += 1
if self.variant in DROP_VARIANTS and promoted:
self.promoted[cord] = 1
promoted = False
if self.variant == CAMBODIANCHESS:
if piece == KING and self.kings[
color] != self.ini_kings[color]:
self.is_first_move[KING][color] = False
if piece == QUEEN and cord != self.ini_queens[color]:
self.is_first_move[QUEEN][color] = False
cord += 1
if self.variant == FISCHERRANDOMCHESS:
# Save ranks fo find outermost rooks
# if KkQq was used in castling rights
if r == 0:
rank8 = rank
elif r == 7:
rank1 = rank
# Parse active color field
if colChr.lower() == "w":
self.setColor(WHITE)
else:
self.setColor(BLACK)
# Parse castling availability
castling = 0
for char in castChr:
if self.variant == FISCHERRANDOMCHESS:
if char in reprFile:
if char < reprCord[self.kings[BLACK]][0]:
castling |= B_OOO
self.ini_rooks[1][0] = reprFile.index(char) + 56
else:
castling |= B_OO
self.ini_rooks[1][1] = reprFile.index(char) + 56
elif char in [c.upper() for c in reprFile]:
if char < reprCord[self.kings[WHITE]][0].upper():
castling |= W_OOO
self.ini_rooks[0][0] = reprFile.index(char.lower())
else:
castling |= W_OO
self.ini_rooks[0][1] = reprFile.index(char.lower())
elif char == "K":
castling |= W_OO
self.ini_rooks[0][1] = rank1.rfind('R')
elif char == "Q":
castling |= W_OOO
self.ini_rooks[0][0] = rank1.find('R')
elif char == "k":
castling |= B_OO
self.ini_rooks[1][1] = rank8.rfind('r') + 56
elif char == "q":
castling |= B_OOO
self.ini_rooks[1][0] = rank8.find('r') + 56
else:
if char == "K":
castling |= W_OO
elif char == "Q":
castling |= W_OOO
elif char == "k":
castling |= B_OO
elif char == "q":
castling |= B_OOO
if self.variant in (WILDCASTLECHESS, WILDCASTLESHUFFLECHESS,
FISCHERRANDOMCHESS):
self.ini_kings[WHITE] = self.kings[WHITE]
self.ini_kings[BLACK] = self.kings[BLACK]
if self.variant in (WILDCASTLECHESS, WILDCASTLESHUFFLECHESS):
if self.ini_kings[WHITE] == D1 and self.ini_kings[BLACK] == D8:
self.fin_kings = ([B1, F1], [B8, F8])
self.fin_rooks = ([C1, E1], [C8, E8])
elif self.ini_kings[WHITE] == D1:
self.fin_kings = ([B1, F1], [C8, G8])
self.fin_rooks = ([C1, E1], [D8, F8])
elif self.ini_kings[BLACK] == D8:
self.fin_kings = ([C1, G1], [B8, F8])
self.fin_rooks = ([D1, F1], [C8, E8])
else:
self.fin_kings = ([C1, G1], [C8, G8])
self.fin_rooks = ([D1, F1], [D8, F8])
self.setCastling(castling)
# Parse en passant target sqaure
if epChr == "-":
self.setEnpassant(None)
else:
self.setEnpassant(cordDic[epChr])
# Parse halfmove clock field
if fiftyChr.isdigit():
self.fifty = int(fiftyChr)
else:
self.fifty = 0
# Parse fullmove number
if moveNoChr.isdigit():
movenumber = max(int(moveNoChr), 1) * 2 - 2
if self.color == BLACK:
movenumber += 1
self.plyCount = movenumber
else:
self.plyCount = 1
self.fen_was_applied = True
def applyFen(self, fenstr):
""" Applies the fenstring to the board.
If the string is not properly
written a SyntaxError will be raised, having its message ending in
Pos(%d) specifying the string index of the problem.
if an error is found, no changes will be made to the board. """
assert not self.fen_was_applied, "The applyFen() method can be used on new LBoard objects only!"
# Set board to empty on Black's turn (which Polyglot-hashes to 0)
self.blocker = 0
self.friends = [0] * 2
self.kings = [-1] * 2
self.boards = [[0] * 7 for i in range(2)]
self.enpassant = None # cord which can be captured by enpassant or None
self.color = BLACK
self.castling = 0 # The castling availability in the position
self.hasCastled = [False, False]
self.fifty = 0 # A ply counter for the fifty moves rule
self.plyCount = 0
self.checked = None
self.opchecked = None
self.arBoard = [0] * 64
self.hash = 0
self.pawnhash = 0
# Data from the position's history:
self.hist_move = [] # The move that was applied to get the position
self.hist_tpiece = [
] # The piece the move captured, == EMPTY for normal moves
self.hist_enpassant = []
self.hist_castling = []
self.hist_hash = []
self.hist_fifty = []
self.hist_checked = []
self.hist_opchecked = []
# piece counts
self.pieceCount = [[0] * 7, [0] * 7]
# initial cords of rooks and kings for castling in Chess960
if self.variant == FISCHERRANDOMCHESS:
self.ini_kings = [None, None]
self.ini_rooks = ([None, None], [None, None])
elif self.variant in (WILDCASTLECHESS, WILDCASTLESHUFFLECHESS):
self.ini_kings = [None, None]
self.fin_kings = ([None, None], [None, None])
self.fin_rooks = ([None, None], [None, None])
elif self.variant in DROP_VARIANTS:
self.iniHouse()
elif self.variant == ATOMICCHESS:
self.iniAtomic()
elif self.variant == CAMBODIANCHESS:
self.iniCambodian()
# Get information
parts = fenstr.split()
castChr = "-"
epChr = "-"
fiftyChr = "0"
moveNoChr = "1"
if STRICT_FEN and len(parts) != 6:
raise SyntaxError(_("FEN needs 6 data fields. \n\n%s") % fenstr)
elif len(parts) < 2:
raise SyntaxError(
_("FEN needs at least 2 data fields in fenstr. \n\n%s") %
fenstr)
elif len(parts) >= 6:
pieceChrs, colChr, castChr, epChr, fiftyChr, moveNoChr = parts[:6]
elif len(parts) == 5:
pieceChrs, colChr, castChr, epChr, fiftyChr = parts
elif len(parts) == 4:
if parts[2].isdigit() and parts[3].isdigit():
# xboard FEN usage for asian variants
pieceChrs, colChr, fiftyChr, moveNoChr = parts
else:
pieceChrs, colChr, castChr, epChr = parts
elif len(parts) == 3:
pieceChrs, colChr, castChr = parts
else:
pieceChrs, colChr = parts
# Try to validate some information
# TODO: This should be expanded and perhaps moved
slashes = pieceChrs.count("/")
if slashes < 7:
raise SyntaxError(
_("Needs 7 slashes in piece placement field. \n\n%s") % fenstr)
if not colChr.lower() in ("w", "b"):
raise SyntaxError(
_("Active color field must be one of w or b. \n\n%s") % fenstr)
if castChr != "-":
for Chr in castChr:
valid_chars = "ABCDEFGHKQ" if self.variant == FISCHERRANDOMCHESS else "KQ"
if Chr.upper() not in valid_chars:
if self.variant == CAMBODIANCHESS:
pass
# sjaakii uses DEde in cambodian starting fen to indicate
# that queens and kings are virgins (not moved yet)
else:
raise SyntaxError(_("Castling availability field is not legal. \n\n%s")
% fenstr)
if epChr != "-" and epChr not in cordDic:
raise SyntaxError(_("En passant cord is not legal. \n\n%s") %
fenstr)
# Parse piece placement field
promoted = False
# if there is a holding within [] we change it to BFEN style first
if pieceChrs.endswith("]"):
pieceChrs = pieceChrs[:-1].replace("[", "/")
for r, rank in enumerate(pieceChrs.split("/")):
cord = (7 - r) * 8
for char in rank:
if r > 7:
# After the 8.rank BFEN can contain holdings (captured pieces)
# "~" after a piece letter denotes promoted piece
if r == 8 and self.variant in DROP_VARIANTS:
color = char.islower() and BLACK or WHITE
piece = chrU2Sign[char.upper()]
self.holding[color][piece] += 1
continue
else:
break
if char.isdigit():
cord += int(char)
elif char == "~":
promoted = True
else:
color = char.islower() and BLACK or WHITE
piece = chrU2Sign[char.upper()]
self._addPiece(cord, piece, color)
self.pieceCount[color][piece] += 1
if self.variant in DROP_VARIANTS and promoted:
self.promoted[cord] = 1
promoted = False
if self.variant == CAMBODIANCHESS:
if piece == KING and self.kings[
color] != self.ini_kings[color]:
self.is_first_move[KING][color] = False
if piece == QUEEN and cord != self.ini_queens[color]:
self.is_first_move[QUEEN][color] = False
cord += 1
if self.variant == FISCHERRANDOMCHESS:
# Save ranks fo find outermost rooks
# if KkQq was used in castling rights
if r == 0:
rank8 = rank
elif r == 7:
rank1 = rank
# Parse active color field
if colChr.lower() == "w":
self.setColor(WHITE)
else:
self.setColor(BLACK)
# Parse castling availability
castling = 0
for char in castChr:
if self.variant == FISCHERRANDOMCHESS:
if char in reprFile:
if char < reprCord[self.kings[BLACK]][0]:
castling |= B_OOO
self.ini_rooks[1][0] = reprFile.index(char) + 56
else:
castling |= B_OO
self.ini_rooks[1][1] = reprFile.index(char) + 56
elif char in [c.upper() for c in reprFile]:
if char < reprCord[self.kings[WHITE]][0].upper():
castling |= W_OOO
self.ini_rooks[0][0] = reprFile.index(char.lower())
else:
castling |= W_OO
self.ini_rooks[0][1] = reprFile.index(char.lower())
elif char == "K":
castling |= W_OO
self.ini_rooks[0][1] = rank1.rfind('R')
elif char == "Q":
castling |= W_OOO
self.ini_rooks[0][0] = rank1.find('R')
elif char == "k":
castling |= B_OO
self.ini_rooks[1][1] = rank8.rfind('r') + 56
elif char == "q":
castling |= B_OOO
self.ini_rooks[1][0] = rank8.find('r') + 56
else:
if char == "K":
castling |= W_OO
elif char == "Q":
castling |= W_OOO
elif char == "k":
castling |= B_OO
elif char == "q":
castling |= B_OOO
if self.variant in (WILDCASTLECHESS, WILDCASTLESHUFFLECHESS,
FISCHERRANDOMCHESS):
self.ini_kings[WHITE] = self.kings[WHITE]
self.ini_kings[BLACK] = self.kings[BLACK]
if self.variant in (WILDCASTLECHESS, WILDCASTLESHUFFLECHESS):
if self.ini_kings[WHITE] == D1 and self.ini_kings[BLACK] == D8:
self.fin_kings = ([B1, F1], [B8, F8])
self.fin_rooks = ([C1, E1], [C8, E8])
elif self.ini_kings[WHITE] == D1:
self.fin_kings = ([B1, F1], [C8, G8])
self.fin_rooks = ([C1, E1], [D8, F8])
elif self.ini_kings[BLACK] == D8:
self.fin_kings = ([C1, G1], [B8, F8])
self.fin_rooks = ([D1, F1], [C8, E8])
else:
self.fin_kings = ([C1, G1], [C8, G8])
self.fin_rooks = ([D1, F1], [D8, F8])
self.setCastling(castling)
# Parse en passant target sqaure
if epChr == "-":
self.setEnpassant(None)
else:
self.setEnpassant(cordDic[epChr])
# Parse halfmove clock field
if fiftyChr.isdigit():
self.fifty = int(fiftyChr)
else:
self.fifty = 0
# Parse fullmove number
if moveNoChr.isdigit():
movenumber = max(int(moveNoChr), 1) * 2 - 2
if self.color == BLACK:
movenumber += 1
self.plyCount = movenumber
else:
self.plyCount = 1
self.fen_was_applied = True