def parseSAN(board, san, full=True):
""" Parse a Short/Abbreviated Algebraic Notation string """
notat = san
color = board.color
if notat == "--":
return newMove(board.kings[color], board.kings[color], NULL_MOVE)
if notat[-1] in "+#":
notat = notat[:-1]
# If '++' was used in place of #
if notat[-1] == "+":
notat = notat[:-1]
flag = NORMAL_MOVE
# If last char is a piece char, we assue it the promote char
c = notat[-1]
if c in "KQRBNSMFkqrbnsmf.":
c = c.lower()
if c == "k" and board.variant != SUICIDECHESS:
raise ParsingError(san, _("invalid promoted piece"), board.asFen())
elif c == "." and board.variant in (CAMBODIANCHESS, MAKRUKCHESS,
SITTUYINCHESS):
# temporary hack for xboard bug
flag = QUEEN_PROMOTION
else:
flag = chr2Sign[c] + 2
if notat[-2] == "=":
notat = notat[:-2]
else:
notat = notat[:-1]
if len(notat) < 2:
raise ParsingError(san, _("the move needs a piece and a cord"),
board.asFen())
if notat[0] in "O0o":
fcord = board.ini_kings[color]
flag = KING_CASTLE if notat == "O-O" or notat == "0-0" or notat == "o-o" else QUEEN_CASTLE
side = flag - QUEEN_CASTLE
if FILE(fcord) == 3 and board.variant in (WILDCASTLECHESS,
WILDCASTLESHUFFLECHESS):
side = 0 if side == 1 else 1
if board.variant == FISCHERRANDOMCHESS:
tcord = board.ini_rooks[color][side]
else:
tcord = board.fin_kings[color][side]
return newMove(fcord, tcord, flag)
# LAN is not allowed in pgn spec, but sometimes it occures
if "-" in notat:
notat = notat.replace("-", "")
if "@" in notat:
tcord = cordDic[notat[-2:]]
if notat[0].islower():
# Sjeng-ism
piece = chr2Sign[notat[0]]
else:
piece = chrU2Sign[notat[0]]
return newMove(piece, tcord, DROP)
if notat[0] in "QRBKNSMF":
piece = chrU2Sign[notat[0]]
notat = notat[1:]
else:
piece = PAWN
if notat[
-1] in "18" and flag == NORMAL_MOVE and board.variant != SITTUYINCHESS:
raise ParsingError(
san, _("promotion move without promoted piece is incorrect"),
board.asFen())
if "x" in notat:
notat, tcord = notat.split("x")
if tcord not in cordDic:
raise ParsingError(
san,
_("the captured cord (%s) is incorrect") % tcord,
board.asFen())
tcord = cordDic[tcord]
if piece == PAWN:
# If a pawn is attacking an empty cord, we assue it an enpassant
if board.arBoard[tcord] == EMPTY:
if (color == BLACK and 2 * 8 <= tcord < 3 * 8) or (
color == WHITE and 5 * 8 <= tcord < 6 * 8):
flag = ENPASSANT
else:
raise ParsingError(
san, _("pawn capture without target piece is invalid"),
board.asFen())
else:
if not notat[-2:] in cordDic:
raise ParsingError(
san,
_("the end cord (%s) is incorrect") % notat[-2:],
board.asFen())
tcord = cordDic[notat[-2:]]
notat = notat[:-2]
# In suicide promoting to king is valid, so
# more than 1 king per side can exist !
if board.variant != SUICIDECHESS and piece == KING:
return newMove(board.kings[color], tcord, flag)
# If there is any extra location info, like in the move Bexd1 or Nh3f4 we
# want to know
frank = None
ffile = None
if notat and notat[0] in reprRank:
frank = int(notat[0]) - 1
notat = notat[1:]
if notat and notat[0] in reprFile:
ffile = ord(notat[0]) - ord("a")
notat = notat[1:]
if notat and notat[0] in reprRank:
frank = int(notat[0]) - 1
notat = notat[1:]
# we know all we want
return newMove(frank * 8 + ffile, tcord, flag)
if piece == PAWN:
if (ffile is not None) and ffile != FILE(tcord):
# capture
if color == WHITE:
fcord = tcord - 7 if ffile > FILE(tcord) else tcord - 9
else:
fcord = tcord + 7 if ffile < FILE(tcord) else tcord + 9
else:
if color == WHITE:
pawns = board.boards[WHITE][PAWN]
fcord = tcord - 16 if RANK(tcord) == 3 and not (
pawns & fileBits[FILE(tcord)] & rankBits[2]) else tcord - 8
else:
pawns = board.boards[BLACK][PAWN]
fcord = tcord + 16 if RANK(tcord) == 4 and not (
pawns & fileBits[FILE(tcord)] & rankBits[5]) else tcord + 8
if board.variant == SITTUYINCHESS and flag == QUEEN_PROMOTION and \
(pawns & fileBits[FILE(tcord)] & rankBits[RANK(tcord)]):
return newMove(tcord, tcord, flag)
return newMove(fcord, tcord, flag)
else:
if board.pieceCount[color][piece] == 1:
# we have only one from this kind if piece, so:
fcord = firstBit(board.boards[color][piece])
return newMove(fcord, tcord, flag)
else:
# We find all pieces who could have done it. (If san was legal, there should
# never be more than one)
moves = genPieceMoves(board, piece, tcord)
if len(moves) == 1:
return moves.pop()
else:
for move in moves:
f = FCORD(move)
if frank is not None and frank != RANK(f):
continue
if ffile is not None and ffile != FILE(f):
continue
board_clone = board.clone(full)
board_clone.applyMove(move, full)
if board_clone.opIsChecked():
continue
return move
errstring = "no %s is able to move to %s" % (reprPiece[piece],
reprCord[tcord])
raise ParsingError(san, errstring, board.asFen())
def parseSAN(board, san):
""" Parse a Short/Abbreviated Algebraic Notation string """
notat = san
color = board.color
if notat == "--":
return newMove(board.kings[color], board.kings[color], NULL_MOVE)
if notat[-1] in "+#":
notat = notat[:-1]
# If '++' was used in place of #
if notat[-1] == "+":
notat = notat[:-1]
flag = NORMAL_MOVE
# If last char is a piece char, we assue it the promote char
c = notat[-1]
if c in "KQRBNSMFkqrbnsmf.":
c = c.lower()
if c == "k" and board.variant != SUICIDECHESS and board.variant != GIVEAWAYCHESS:
raise ParsingError(san, _("invalid promoted piece"), board.asFen())
elif c == ".":
if board.variant in (CAMBODIANCHESS, MAKRUKCHESS, SITTUYINCHESS):
# temporary hack for xboard bug
flag = QUEEN_PROMOTION
else:
raise ParsingError(san, "invalid san", board.asFen())
else:
flag = chr2Sign[c] + 2
if notat[-2] == "=":
notat = notat[:-2]
else:
notat = notat[:-1]
if len(notat) < 2:
raise ParsingError(san, _("the move needs a piece and a cord"),
board.asFen())
if notat[0] in "O0o":
fcord = board.ini_kings[color]
flag = KING_CASTLE if notat in ("O-O", "0-0", "o-o", "OO", "00",
"oo") else QUEEN_CASTLE
side = flag - QUEEN_CASTLE
if FILE(fcord) == 3 and board.variant in (WILDCASTLECHESS,
WILDCASTLESHUFFLECHESS):
side = 0 if side == 1 else 1
if board.variant == FISCHERRANDOMCHESS:
tcord = board.ini_rooks[color][side]
else:
tcord = board.fin_kings[color][side]
return newMove(fcord, tcord, flag)
# LAN is not allowed in pgn spec, but sometimes it occures
if "-" in notat:
notat = notat.replace("-", "")
if "@" in notat:
tcord = cordDic[notat[-2:]]
if notat[0].islower():
# Sjeng-ism
piece = chr2Sign[notat[0]]
else:
piece = chrU2Sign[notat[0]]
return newMove(piece, tcord, DROP)
# standard piece letters
if notat[0] in "QRBKNSMF":
piece = chrU2Sign[notat[0]]
notat = notat[1:]
# unambigious lowercase piece letters
elif notat[0] in "qrknsm":
piece = chr2Sign[notat[0]]
notat = notat[1:]
# a lowercase bishop letter or a pawn capture
elif notat[0] == "b" and len(notat) > 2 and board.variant == NORMALCHESS:
tcord = cordDic[notat[-2:]]
trank = int(notat[-1])
# if from and to lines are not neighbours -> Bishop
if abs(ord(notat[0]) - ord(notat[-2])) > 1:
piece = chr2Sign[notat[0]]
notat = notat[1:]
# if from and to lines are neighbours (or the same) but to is an empty square
# which can't be en-passant square target -> Bishop
elif board.arBoard[tcord] == EMPTY and (
(color == BLACK and trank != 3) or
(color == WHITE and trank != 6)):
piece = chr2Sign[notat[0]]
notat = notat[1:]
# elif "ba3", "bc3" ,"ba6", "bc6"
# these can be Bishop or Pawn moves, but we don't try to introspect them (sorry)
else:
piece = PAWN
else:
piece = PAWN
if notat[
-1] in "18" and flag == NORMAL_MOVE and board.variant != SITTUYINCHESS:
flag = QUEEN_PROMOTION
if "x" in notat:
notat, tcord = notat.split("x")
if tcord not in cordDic:
raise ParsingError(
san,
_("the captured cord (%s) is incorrect") % tcord,
board.asFen())
tcord = cordDic[tcord]
if piece == PAWN:
# If a pawn is attacking an empty cord, we assue it an enpassant
if board.arBoard[tcord] == EMPTY:
if (color == BLACK and 2 * 8 <= tcord < 3 * 8) or (
color == WHITE and 5 * 8 <= tcord < 6 * 8):
flag = ENPASSANT
else:
raise ParsingError(
san, _("pawn capture without target piece is invalid"),
board.asFen())
else:
if not notat[-2:] in cordDic:
raise ParsingError(
san,
_("the end cord (%s) is incorrect") % notat[-2:],
board.asFen())
tcord = cordDic[notat[-2:]]
notat = notat[:-2]
# In suicide promoting to king is valid, so
# more than 1 king per side can exist !
if board.variant != SUICIDECHESS and board.variant != GIVEAWAYCHESS and piece == KING:
return newMove(board.kings[color], tcord, flag)
# If there is any extra location info, like in the move Bexd1 or Nh3f4 we
# want to know
frank = None
ffile = None
if notat and notat[0] in reprRank:
frank = int(notat[0]) - 1
notat = notat[1:]
if notat and notat[0] in reprFile:
ffile = ord(notat[0]) - ord("a")
notat = notat[1:]
if notat and notat[0] in reprRank:
frank = int(notat[0]) - 1
notat = notat[1:]
# we know all we want
return newMove(frank * 8 + ffile, tcord, flag)
if piece == PAWN:
if (ffile is not None) and ffile != FILE(tcord):
# capture
if color == WHITE:
fcord = tcord - 7 if ffile > FILE(tcord) else tcord - 9
else:
fcord = tcord + 7 if ffile < FILE(tcord) else tcord + 9
else:
if color == WHITE:
pawns = board.boards[WHITE][PAWN]
# In horde white pawns on first rank may move two squares also
if board.variant == HORDECHESS and RANK(tcord) == 2 and not (
pawns & fileBits[FILE(tcord)] & rankBits[1]):
fcord = tcord - 16
else:
fcord = tcord - 16 if RANK(tcord) == 3 and not (
pawns & fileBits[FILE(tcord)]
& rankBits[2]) else tcord - 8
else:
pawns = board.boards[BLACK][PAWN]
fcord = tcord + 16 if RANK(tcord) == 4 and not (
pawns & fileBits[FILE(tcord)] & rankBits[5]) else tcord + 8
if board.variant == SITTUYINCHESS and flag == QUEEN_PROMOTION:
if pawns & fileBits[FILE(tcord)] & rankBits[RANK(tcord)]:
# in place promotion
return newMove(tcord, tcord, flag)
else:
# queen move promotion (fcord have to be the closest cord of promotion zone)
fcord = sittuyin_promotion_fcord(board, tcord)
return newMove(fcord, tcord, flag)
return newMove(fcord, tcord, flag)
else:
if board.pieceCount[color][piece] == 1:
# we have only one from this kind if piece, so:
fcord = firstBit(board.boards[color][piece])
return newMove(fcord, tcord, flag)
else:
# We find all pieces who could have done it. (If san was legal, there should
# never be more than one)
moves = genPieceMoves(board, piece, tcord)
if len(moves) == 1:
return moves.pop()
else:
for move in moves:
f = FCORD(move)
if frank is not None and frank != RANK(f):
continue
if ffile is not None and ffile != FILE(f):
continue
board_clone = board.clone()
board_clone.applyMove(move)
if board_clone.opIsChecked():
continue
return move
errstring = _("no %(piece)s is able to move to %(cord)s") % {
"piece": reprPiece[piece],
"cord": reprCord[tcord]
}
raise ParsingError(san, errstring, board.asFen())
def parseSAN (board, san):
""" Parse a Short/Abbreviated Algebraic Notation string """
notat = san
color = board.color
if notat == "--":
return newMove(board.kings[color], board.kings[color], NULL_MOVE)
if notat[-1] in ("+", "#"):
notat = notat[:-1]
# If '++' was used in place of #
if notat[-1] == "+":
notat = notat[:-1]
flag = NORMAL_MOVE
# If last char is a piece char, we assue it the promote char
c = notat[-1]
if c in ("K", "Q", "R", "B", "N", "k", "q", "r", "b", "n"):
c = c.lower()
if c == "k" and board.variant != SUICIDECHESS:
raise ParsingError, (san, "invalid promoted piece", board.asFen())
flag = chr2Sign[c] + 2
if notat[-2] == "=":
notat = notat[:-2]
else: notat = notat[:-1]
if len(notat) < 2:
raise ParsingError, (san, _("the move needs a piece and a cord"), board.asFen())
if notat[0] in "O0o":
fcord = board.ini_kings[color]
flag = KING_CASTLE if notat == "O-O" or notat == "0-0" or notat == "o-o" else QUEEN_CASTLE
side = flag -QUEEN_CASTLE
if FILE(fcord) == 3 and board.variant in (WILDCASTLECHESS, WILDCASTLESHUFFLECHESS):
side = 0 if side == 1 else 1
if board.variant == FISCHERRANDOMCHESS:
tcord = board.ini_rooks[color][side]
else:
tcord = board.fin_kings[color][side]
return newMove (fcord, tcord, flag)
# LAN is not allowed in pgn spec, but sometimes it occures
if "-" in notat:
notat = notat.replace("-", "")
if "@" in notat:
tcord = cordDic[notat[-2:]]
if notat[0].islower():
# Sjeng-ism
piece = chr2Sign[notat[0]]
else:
piece = chrU2Sign[notat[0]]
return newMove(piece, tcord, DROP)
if notat[0] in ("Q", "R", "B", "K", "N"):
piece = chrU2Sign[notat[0]]
notat = notat[1:]
else:
piece = PAWN
if notat[-1] in ("1", "8") and flag == NORMAL_MOVE:
raise ParsingError, (
san, _("promotion move without promoted piece is incorrect"), board.asFen())
if "x" in notat:
notat, tcord = notat.split("x")
if not tcord in cordDic:
raise ParsingError, (
san, _("the captured cord (%s) is incorrect") % tcord, board.asFen())
tcord = cordDic[tcord]
if piece == PAWN:
# If a pawn is attacking an empty cord, we assue it an enpassant
if board.arBoard[tcord] == EMPTY:
flag = ENPASSANT
else:
if not notat[-2:] in cordDic:
raise ParsingError, (
san, "the end cord (%s) is incorrect" % notat[-2:], board.asFen())
tcord = cordDic[notat[-2:]]
notat = notat[:-2]
# In suicide promoting to king is valid, so
# more than 1 king per side can exist !
if board.variant != SUICIDECHESS and piece == KING:
return newMove(board.kings[color], tcord, flag)
# If there is any extra location info, like in the move Bexd1 or Nh3f4 we
# want to know
frank = None
ffile = None
if notat and notat[0] in reprRank:
frank = int(notat[0])-1
notat = notat[1:]
if notat and notat[0] in reprFile:
ffile = ord(notat[0]) - ord("a")
notat = notat[1:]
if notat and notat[0] in reprRank:
frank = int(notat[0])-1
notat = notat[1:]
# we know all we want
return newMove(frank*8+ffile, tcord, flag)
if piece == PAWN:
if (ffile is not None) and ffile != FILE(tcord):
# capture
if color == WHITE:
fcord = tcord-7 if ffile > FILE(tcord) else tcord-9
else:
fcord = tcord+7 if ffile < FILE(tcord) else tcord+9
else:
if color == WHITE:
pawns = board.boards[WHITE][PAWN]
fcord = tcord-16 if RANK(tcord)==3 and not (pawns & fileBits[FILE(tcord)] & rankBits[2]) else tcord-8
else:
pawns = board.boards[BLACK][PAWN]
fcord = tcord+16 if RANK(tcord)==4 and not (pawns & fileBits[FILE(tcord)] & rankBits[5]) else tcord+8
return newMove(fcord, tcord, flag)
else:
if board.pieceCount[color][piece] == 1:
# we have only one from this kind if piece, so:
fcord = firstBit(board.boards[color][piece])
return newMove(fcord, tcord, flag)
else:
# We find all pieces who could have done it. (If san was legal, there should
# never be more than one)
moves = genPieceMoves(board, piece, tcord)
if len(moves) == 1:
return moves.pop()
else:
for move in moves:
f = FCORD(move)
if frank != None and frank != RANK(f):
continue
if ffile != None and ffile != FILE(f):
continue
board_clone = board.clone()
board_clone.applyMove(move)
if board_clone.opIsChecked():
continue
return move
errstring = "no %s is able to move to %s" % (reprPiece[piece], reprCord[tcord])
raise ParsingError, (san, errstring, board.asFen())
def parseSAN(board, san):
""" Parse a Short/Abbreviated Algebraic Notation string """
notat = san
color = board.color
if notat == "--":
return newMove(board.kings[color], board.kings[color], NULL_MOVE)
if notat[-1] in "+#":
notat = notat[:-1]
# If '++' was used in place of #
if notat[-1] == "+":
notat = notat[:-1]
flag = NORMAL_MOVE
# If last char is a piece char, we assue it the promote char
c = notat[-1]
if c in "KQRBNSMFkqrbnsmf.":
c = c.lower()
if c == "k" and board.variant != SUICIDECHESS and board.variant != GIVEAWAYCHESS:
raise ParsingError(san, _("invalid promoted piece"), board.asFen())
elif c == "." and board.variant in (CAMBODIANCHESS, MAKRUKCHESS,
SITTUYINCHESS):
# temporary hack for xboard bug
flag = QUEEN_PROMOTION
else:
flag = chr2Sign[c] + 2
if notat[-2] == "=":
notat = notat[:-2]
else:
notat = notat[:-1]
if len(notat) < 2:
raise ParsingError(san, _("the move needs a piece and a cord"),
board.asFen())
if notat[0] in "O0o":
fcord = board.ini_kings[color]
flag = KING_CASTLE if notat in ("O-O", "0-0", "o-o", "OO", "00", "oo") else QUEEN_CASTLE
side = flag - QUEEN_CASTLE
if FILE(fcord) == 3 and board.variant in (WILDCASTLECHESS,
WILDCASTLESHUFFLECHESS):
side = 0 if side == 1 else 1
if board.variant == FISCHERRANDOMCHESS:
tcord = board.ini_rooks[color][side]
else:
tcord = board.fin_kings[color][side]
return newMove(fcord, tcord, flag)
# LAN is not allowed in pgn spec, but sometimes it occures
if "-" in notat:
notat = notat.replace("-", "")
if "@" in notat:
tcord = cordDic[notat[-2:]]
if notat[0].islower():
# Sjeng-ism
piece = chr2Sign[notat[0]]
else:
piece = chrU2Sign[notat[0]]
return newMove(piece, tcord, DROP)
# standard piece letters
if notat[0] in "QRBKNSMF":
piece = chrU2Sign[notat[0]]
notat = notat[1:]
# unambigious lowercase piece letters
elif notat[0] in "qrknsm":
piece = chr2Sign[notat[0]]
notat = notat[1:]
# a lowercase bishop letter or a pawn capture
elif notat[0] == "b" and len(notat) > 2 and board.variant == NORMALCHESS:
tcord = cordDic[notat[-2:]]
trank = int(notat[-1])
# if from and to lines are not neighbours -> Bishop
if abs(ord(notat[0]) - ord(notat[-2])) > 1:
piece = chr2Sign[notat[0]]
notat = notat[1:]
# if from and to lines are neighbours (or the same) but to is an empty square
# which can't be en-passant square target -> Bishop
elif board.arBoard[tcord] == EMPTY and ((color == BLACK and trank != 3) or (color == WHITE and trank != 6)):
piece = chr2Sign[notat[0]]
notat = notat[1:]
# elif "ba3", "bc3" ,"ba6", "bc6"
# these can be Bishop or Pawn moves, but we don't try to introspect them (sorry)
else:
piece = PAWN
else:
piece = PAWN
if notat[-1] in "18" and flag == NORMAL_MOVE and board.variant != SITTUYINCHESS:
raise ParsingError(
san, _("promotion move without promoted piece is incorrect"),
board.asFen())
if "x" in notat:
notat, tcord = notat.split("x")
if tcord not in cordDic:
raise ParsingError(san, _("the captured cord (%s) is incorrect") %
tcord, board.asFen())
tcord = cordDic[tcord]
if piece == PAWN:
# If a pawn is attacking an empty cord, we assue it an enpassant
if board.arBoard[tcord] == EMPTY:
if (color == BLACK and 2 * 8 <= tcord < 3 * 8) or (color == WHITE and 5 * 8 <= tcord < 6 * 8):
flag = ENPASSANT
else:
raise ParsingError(
san, _("pawn capture without target piece is invalid"),
board.asFen())
else:
if not notat[-2:] in cordDic:
raise ParsingError(san, _("the end cord (%s) is incorrect") %
notat[-2:], board.asFen())
tcord = cordDic[notat[-2:]]
notat = notat[:-2]
# In suicide promoting to king is valid, so
# more than 1 king per side can exist !
if board.variant != SUICIDECHESS and board.variant != GIVEAWAYCHESS and piece == KING:
return newMove(board.kings[color], tcord, flag)
# If there is any extra location info, like in the move Bexd1 or Nh3f4 we
# want to know
frank = None
ffile = None
if notat and notat[0] in reprRank:
frank = int(notat[0]) - 1
notat = notat[1:]
if notat and notat[0] in reprFile:
ffile = ord(notat[0]) - ord("a")
notat = notat[1:]
if notat and notat[0] in reprRank:
frank = int(notat[0]) - 1
notat = notat[1:]
# we know all we want
return newMove(frank * 8 + ffile, tcord, flag)
if piece == PAWN:
if (ffile is not None) and ffile != FILE(tcord):
# capture
if color == WHITE:
fcord = tcord - 7 if ffile > FILE(tcord) else tcord - 9
else:
fcord = tcord + 7 if ffile < FILE(tcord) else tcord + 9
else:
if color == WHITE:
pawns = board.boards[WHITE][PAWN]
# In horde white pawns on first rank may move two squares also
if board.variant == HORDECHESS and RANK(tcord) == 2 and not (
pawns & fileBits[FILE(tcord)] & rankBits[1]):
fcord = tcord - 16
else:
fcord = tcord - 16 if RANK(tcord) == 3 and not (
pawns & fileBits[FILE(tcord)] & rankBits[2]) else tcord - 8
else:
pawns = board.boards[BLACK][PAWN]
fcord = tcord + 16 if RANK(tcord) == 4 and not (
pawns & fileBits[FILE(tcord)] & rankBits[5]) else tcord + 8
if board.variant == SITTUYINCHESS and flag == QUEEN_PROMOTION and \
(pawns & fileBits[FILE(tcord)] & rankBits[RANK(tcord)]):
return newMove(tcord, tcord, flag)
return newMove(fcord, tcord, flag)
else:
if board.pieceCount[color][piece] == 1:
# we have only one from this kind if piece, so:
fcord = firstBit(board.boards[color][piece])
return newMove(fcord, tcord, flag)
else:
# We find all pieces who could have done it. (If san was legal, there should
# never be more than one)
moves = genPieceMoves(board, piece, tcord)
if len(moves) == 1:
return moves.pop()
else:
for move in moves:
f = FCORD(move)
if frank is not None and frank != RANK(f):
continue
if ffile is not None and ffile != FILE(f):
continue
board_clone = board.clone()
board_clone.applyMove(move)
if board_clone.opIsChecked():
continue
return move
errstring = "no %s is able to move to %s" % (reprPiece[piece],
reprCord[tcord])
raise ParsingError(san, errstring, board.asFen())
