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__init__.py
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__init__.py
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# -*- coding: utf-8 -*-
#
# This file is part of the python-chess library.
# Copyright (C) 2012-2015 Niklas Fiekas <niklas.fiekas@tu-clausthal.de>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
__author__ = "Niklas Fiekas"
__email__ = "niklas.fiekas@tu-clausthal.de"
__version__ = "0.11.1"
import collections
import copy
import re
COLORS = [WHITE, BLACK] = [True, False]
PIECE_TYPES = [PAWN, KNIGHT, BISHOP, ROOK, QUEEN, KING] = range(1, 7)
PIECE_SYMBOLS = ["", "p", "n", "b", "r", "q", "k"]
UNICODE_PIECE_SYMBOLS = {
"R": u"♖", "r": u"♜",
"N": u"♘", "n": u"♞",
"B": u"♗", "b": u"♝",
"Q": u"♕", "q": u"♛",
"K": u"♔", "k": u"♚",
"P": u"♙", "p": u"♟",
}
FILE_NAMES = ["a", "b", "c", "d", "e", "f", "g", "h"]
RANK_NAMES = ["1", "2", "3", "4", "5", "6", "7", "8"]
STARTING_FEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
"""The FEN of the standard chess starting position."""
STATUS_VALID = 0
STATUS_NO_WHITE_KING = 1
STATUS_NO_BLACK_KING = 2
STATUS_TOO_MANY_KINGS = 4
STATUS_TOO_MANY_WHITE_PAWNS = 8
STATUS_TOO_MANY_BLACK_PAWNS = 16
STATUS_PAWNS_ON_BACKRANK = 32
STATUS_TOO_MANY_WHITE_PIECES = 64
STATUS_TOO_MANY_BLACK_PIECES = 128
STATUS_BAD_CASTLING_RIGHTS = 256
STATUS_INVALID_EP_SQUARE = 512
STATUS_OPPOSITE_CHECK = 1024
SQUARES = [
A1, B1, C1, D1, E1, F1, G1, H1,
A2, B2, C2, D2, E2, F2, G2, H2,
A3, B3, C3, D3, E3, F3, G3, H3,
A4, B4, C4, D4, E4, F4, G4, H4,
A5, B5, C5, D5, E5, F5, G5, H5,
A6, B6, C6, D6, E6, F6, G6, H6,
A7, B7, C7, D7, E7, F7, G7, H7,
A8, B8, C8, D8, E8, F8, G8, H8 ] = range(64)
SQUARES_180 = [
A8, B8, C8, D8, E8, F8, G8, H8,
A7, B7, C7, D7, E7, F7, G7, H7,
A6, B6, C6, D6, E6, F6, G6, H6,
A5, B5, C5, D5, E5, F5, G5, H5,
A4, B4, C4, D4, E4, F4, G4, H4,
A3, B3, C3, D3, E3, F3, G3, H3,
A2, B2, C2, D2, E2, F2, G2, H2,
A1, B1, C1, D1, E1, F1, G1, H1 ]
SQUARE_NAMES = [
"a1", "b1", "c1", "d1", "e1", "f1", "g1", "h1",
"a2", "b2", "c2", "d2", "e2", "f2", "g2", "h2",
"a3", "b3", "c3", "d3", "e3", "f3", "g3", "h3",
"a4", "b4", "c4", "d4", "e4", "f4", "g4", "h4",
"a5", "b5", "c5", "d5", "e5", "f5", "g5", "h5",
"a6", "b6", "c6", "d6", "e6", "f6", "g6", "h6",
"a7", "b7", "c7", "d7", "e7", "f7", "g7", "h7",
"a8", "b8", "c8", "d8", "e8", "f8", "g8", "h8" ]
def file_index(square):
"""Gets the file index of square where ``0`` is the a file."""
return square & 7
def rank_index(square):
"""Gets the rank index of the square where ``0`` is the first rank."""
return square >> 3
def square(file_index, rank_index):
"""Gets a square number by file and rank index."""
return rank_index * 8 + file_index
BB_VOID = 0b0000000000000000000000000000000000000000000000000000000000000000
BB_ALL = 0b1111111111111111111111111111111111111111111111111111111111111111
BB_SQUARES = [
BB_A1, BB_B1, BB_C1, BB_D1, BB_E1, BB_F1, BB_G1, BB_H1,
BB_A2, BB_B2, BB_C2, BB_D2, BB_E2, BB_F2, BB_G2, BB_H2,
BB_A3, BB_B3, BB_C3, BB_D3, BB_E3, BB_F3, BB_G3, BB_H3,
BB_A4, BB_B4, BB_C4, BB_D4, BB_E4, BB_F4, BB_G4, BB_H4,
BB_A5, BB_B5, BB_C5, BB_D5, BB_E5, BB_F5, BB_G5, BB_H5,
BB_A6, BB_B6, BB_C6, BB_D6, BB_E6, BB_F6, BB_G6, BB_H6,
BB_A7, BB_B7, BB_C7, BB_D7, BB_E7, BB_F7, BB_G7, BB_H7,
BB_A8, BB_B8, BB_C8, BB_D8, BB_E8, BB_F8, BB_G8, BB_H8
] = [ 1 << i for i in SQUARES ]
BB_LIGHT_SQUARES = BB_DARK_SQUARES = BB_VOID
for square_index, mask in enumerate(BB_SQUARES):
if (file_index(square_index) + rank_index(square_index)) % 2:
BB_LIGHT_SQUARES |= mask
else:
BB_DARK_SQUARES |= mask
BB_FILES = [
BB_FILE_A,
BB_FILE_B,
BB_FILE_C,
BB_FILE_D,
BB_FILE_E,
BB_FILE_F,
BB_FILE_G,
BB_FILE_H
] = [
BB_A1 | BB_A2 | BB_A3 | BB_A4 | BB_A5 | BB_A6 | BB_A7 | BB_A8,
BB_B1 | BB_B2 | BB_B3 | BB_B4 | BB_B5 | BB_B6 | BB_B7 | BB_B8,
BB_C1 | BB_C2 | BB_C3 | BB_C4 | BB_C5 | BB_C6 | BB_C7 | BB_C8,
BB_D1 | BB_D2 | BB_D3 | BB_D4 | BB_D5 | BB_D6 | BB_D7 | BB_D8,
BB_E1 | BB_E2 | BB_E3 | BB_E4 | BB_E5 | BB_E6 | BB_E7 | BB_E8,
BB_F1 | BB_F2 | BB_F3 | BB_F4 | BB_F5 | BB_F6 | BB_F7 | BB_F8,
BB_G1 | BB_G2 | BB_G3 | BB_G4 | BB_G5 | BB_G6 | BB_G7 | BB_G8,
BB_H1 | BB_H2 | BB_H3 | BB_H4 | BB_H5 | BB_H6 | BB_H7 | BB_H8
]
FILE_MASK = {}
FILE_MASK[0] = 0
for square_index, mask in enumerate(BB_SQUARES):
FILE_MASK[mask] = BB_FILES[file_index(square_index)]
BB_RANKS = [
BB_RANK_1,
BB_RANK_2,
BB_RANK_3,
BB_RANK_4,
BB_RANK_5,
BB_RANK_6,
BB_RANK_7,
BB_RANK_8
] = [
BB_A1 | BB_B1 | BB_C1 | BB_D1 | BB_E1 | BB_F1 | BB_G1 | BB_H1,
BB_A2 | BB_B2 | BB_C2 | BB_D2 | BB_E2 | BB_F2 | BB_G2 | BB_H2,
BB_A3 | BB_B3 | BB_C3 | BB_D3 | BB_E3 | BB_F3 | BB_G3 | BB_H3,
BB_A4 | BB_B4 | BB_C4 | BB_D4 | BB_E4 | BB_F4 | BB_G4 | BB_H4,
BB_A5 | BB_B5 | BB_C5 | BB_D5 | BB_E5 | BB_F5 | BB_G5 | BB_H5,
BB_A6 | BB_B6 | BB_C6 | BB_D6 | BB_E6 | BB_F6 | BB_G6 | BB_H6,
BB_A7 | BB_B7 | BB_C7 | BB_D7 | BB_E7 | BB_F7 | BB_G7 | BB_H7,
BB_A8 | BB_B8 | BB_C8 | BB_D8 | BB_E8 | BB_F8 | BB_G8 | BB_H8
]
RANK_MASK = {}
RANK_MASK[0] = 0
for square_index, mask in enumerate(BB_SQUARES):
RANK_MASK[mask] = BB_RANKS[rank_index(square_index)]
DIAG_MASK_NW = {}
DIAG_MASK_NW[0] = 0
for i in range(8):
DIAG_MASK_NW[1 << i] = 0
for j in range(i + 1):
DIAG_MASK_NW[1 << i] |= 1 << (i + 7 * j)
for j in range(i + 1):
DIAG_MASK_NW[1 << (i + 7 * j)] = DIAG_MASK_NW[1 << i]
for i in range(63, 55, -1):
DIAG_MASK_NW[1 << i] = 0
for j in range(64 - i):
DIAG_MASK_NW[1 << i] |= 1 << (i - 7 * j)
for j in range(64 - i):
DIAG_MASK_NW[1 << (i - 7 * j)] = DIAG_MASK_NW[1 << i]
DIAG_MASK_NE = {}
DIAG_MASK_NE[0] = 0
for i in range(7, -1, -1):
DIAG_MASK_NE[1 << i] = 0
for j in range(8 - i):
DIAG_MASK_NE[1 << i] |= 1 << (i + 9 * j)
for j in range(8 - i):
DIAG_MASK_NE[1 << (i + 9 * j)] = DIAG_MASK_NE[1 << i]
for i in range(56, 64):
DIAG_MASK_NE[1 << i] = 0
for j in range(i - 55):
DIAG_MASK_NE[1 << i] |= 1 << (i - 9 * j)
for j in range(i - 55):
DIAG_MASK_NE[1 << (i - 9 * j)] = DIAG_MASK_NE[1 << i]
try:
from gmpy2 import popcount as pop_count
from gmpy2 import bit_scan1 as bit_scan
except ImportError:
try:
from gmpy import popcount as pop_count
from gmpy import scan1 as bit_scan
except ImportError:
def pop_count(b):
return bin(b).count("1")
def bit_scan(b, n=0):
string = bin(b)
l = len(string)
r = string.rfind("1", 0, l - n)
if r == -1:
return -1
else:
return l - r - 1
def shift_down(b):
return b >> 8
def shift_2_down(b):
return b >> 16
def shift_up(b):
return (b << 8) & BB_ALL
def shift_2_up(b):
return (b << 16) & BB_ALL
def shift_right(b):
return (b << 1) & ~BB_FILE_A
def shift_2_right(b):
return (b << 2) & ~BB_FILE_A & ~BB_FILE_B
def shift_left(b):
return (b >> 1) & ~BB_FILE_H
def shift_2_left(b):
return (b >> 2) & ~BB_FILE_G & ~BB_FILE_H
def shift_up_left(b):
return (b << 7) & ~BB_FILE_H
def shift_up_right(b):
return (b << 9) & ~BB_FILE_A
def shift_down_left(b):
return (b >> 9) & ~BB_FILE_H
def shift_down_right(b):
return (b >> 7) & ~BB_FILE_A
BB_KNIGHT_ATTACKS = []
KNIGHT_MOVES = {}
KNIGHT_MOVES[0] = 0
for bb_square in BB_SQUARES:
mask = BB_VOID
mask |= shift_left(shift_2_up(bb_square))
mask |= shift_right(shift_2_up(bb_square))
mask |= shift_left(shift_2_down(bb_square))
mask |= shift_right(shift_2_down(bb_square))
mask |= shift_2_left(shift_up(bb_square))
mask |= shift_2_right(shift_up(bb_square))
mask |= shift_2_left(shift_down(bb_square))
mask |= shift_2_right(shift_down(bb_square))
BB_KNIGHT_ATTACKS.append(mask & BB_ALL)
KNIGHT_MOVES[bb_square] = mask & BB_ALL
BB_KING_ATTACKS = []
KING_MOVES = {}
KING_MOVES[0] = 0
for bb_square in BB_SQUARES:
mask = BB_VOID
mask |= shift_left(bb_square)
mask |= shift_right(bb_square)
mask |= shift_up(bb_square)
mask |= shift_down(bb_square)
mask |= shift_up_left(bb_square)
mask |= shift_up_right(bb_square)
mask |= shift_down_left(bb_square)
mask |= shift_down_right(bb_square)
BB_KING_ATTACKS.append(mask & BB_ALL)
KING_MOVES[bb_square] = mask & BB_ALL
def _attack_table(square_list):
attack_table = {}
attack_table[0] = {}
attack_table[0][0] = 0
for i in range(len(square_list)):
list_size = len(square_list[i])
for current_position in range(list_size):
current_bb = square_list[i][current_position]
attack_table[current_bb] = {}
for occupation in range(1 << list_size):
moves = 0
# Loop over squares to the right of the mover.
for newsquare in range(current_position + 1, list_size):
moves |= square_list[i][newsquare]
if (1 << newsquare) & occupation:
break
# Loop over squares to the left of the mover.
for newsquare in range(current_position - 1, -1, -1):
moves |= square_list[i][newsquare]
if (1 << newsquare) & occupation:
break
# Convert occupation to a bitboard number.
temp_bb = 0
while occupation:
lowest = occupation & -occupation
temp_bb |= square_list[i][BB_SQUARES.index(lowest)]
occupation = occupation & (occupation - 1)
attack_table[current_bb][temp_bb] = moves
return attack_table
DIAG_ATTACKS_NE = _attack_table([
[BB_H1],
[BB_H2, BB_G1],
[BB_H3, BB_G2, BB_F1],
[BB_H4, BB_G3, BB_F2, BB_E1],
[BB_H5, BB_G4, BB_F3, BB_E2, BB_D1],
[BB_H6, BB_G5, BB_F4, BB_E3, BB_D2, BB_C1],
[BB_H7, BB_G6, BB_F5, BB_E4, BB_D3, BB_C2, BB_B1],
[BB_H8, BB_G7, BB_F6, BB_E5, BB_D4, BB_C3, BB_B2, BB_A1],
[BB_G8, BB_F7, BB_E6, BB_D5, BB_C4, BB_B3, BB_A2],
[BB_F8, BB_E7, BB_D6, BB_C5, BB_B4, BB_A3],
[BB_E8, BB_D7, BB_C6, BB_B5, BB_A4],
[BB_D8, BB_C7, BB_B6, BB_A5],
[BB_C8, BB_B7, BB_A6],
[BB_B8, BB_A7],
[BB_A8],
])
DIAG_ATTACKS_NW = _attack_table([
[BB_A1],
[BB_B1, BB_A2],
[BB_C1, BB_B2, BB_A3],
[BB_D1, BB_C2, BB_B3, BB_A4],
[BB_E1, BB_D2, BB_C3, BB_B4, BB_A5],
[BB_F1, BB_E2, BB_D3, BB_C4, BB_B5, BB_A6],
[BB_G1, BB_F2, BB_E3, BB_D4, BB_C5, BB_B6, BB_A7],
[BB_H1, BB_G2, BB_F3, BB_E4, BB_D5, BB_C6, BB_B7, BB_A8],
[BB_H2, BB_G3, BB_F4, BB_E5, BB_D6, BB_C7, BB_B8],
[BB_H3, BB_G4, BB_F5, BB_E6, BB_D7, BB_C8],
[BB_H4, BB_G5, BB_F6, BB_E7, BB_D8],
[BB_H5, BB_G6, BB_F7, BB_E8],
[BB_H6, BB_G7, BB_F8],
[BB_H7, BB_G8],
[BB_H8],
])
FILE_ATTACKS = _attack_table([
[BB_A1, BB_A2, BB_A3, BB_A4, BB_A5, BB_A6, BB_A7, BB_A8],
[BB_B1, BB_B2, BB_B3, BB_B4, BB_B5, BB_B6, BB_B7, BB_B8],
[BB_C1, BB_C2, BB_C3, BB_C4, BB_C5, BB_C6, BB_C7, BB_C8],
[BB_D1, BB_D2, BB_D3, BB_D4, BB_D5, BB_D6, BB_D7, BB_D8],
[BB_E1, BB_E2, BB_E3, BB_E4, BB_E5, BB_E6, BB_E7, BB_E8],
[BB_F1, BB_F2, BB_F3, BB_F4, BB_F5, BB_F6, BB_F7, BB_F8],
[BB_G1, BB_G2, BB_G3, BB_G4, BB_G5, BB_G6, BB_G7, BB_G8],
[BB_H1, BB_H2, BB_H3, BB_H4, BB_H5, BB_H6, BB_H7, BB_H8],
])
RANK_ATTACKS = _attack_table([
[BB_A1, BB_B1, BB_C1, BB_D1, BB_E1, BB_F1, BB_G1, BB_H1],
[BB_A2, BB_B2, BB_C2, BB_D2, BB_E2, BB_F2, BB_G2, BB_H2],
[BB_A3, BB_B3, BB_C3, BB_D3, BB_E3, BB_F3, BB_G3, BB_H3],
[BB_A4, BB_B4, BB_C4, BB_D4, BB_E4, BB_F4, BB_G4, BB_H4],
[BB_A5, BB_B5, BB_C5, BB_D5, BB_E5, BB_F5, BB_G5, BB_H5],
[BB_A6, BB_B6, BB_C6, BB_D6, BB_E6, BB_F6, BB_G6, BB_H6],
[BB_A7, BB_B7, BB_C7, BB_D7, BB_E7, BB_F7, BB_G7, BB_H7],
[BB_A8, BB_B8, BB_C8, BB_D8, BB_E8, BB_F8, BB_G8, BB_H8],
])
SAN_REGEX = re.compile("^([NBKRQ])?([a-h])?([1-8])?x?([a-h][1-8])(=?[nbrqNBRQ])?(\\+|#)?$")
FEN_CASTLING_REGEX = re.compile("^-|[KQABCDEFGH]{0,2}[kqabcdefgh]{0,2}$")
POLYGLOT_RANDOM_ARRAY = [
0x9D39247E33776D41, 0x2AF7398005AAA5C7, 0x44DB015024623547, 0x9C15F73E62A76AE2,
0x75834465489C0C89, 0x3290AC3A203001BF, 0x0FBBAD1F61042279, 0xE83A908FF2FB60CA,
0x0D7E765D58755C10, 0x1A083822CEAFE02D, 0x9605D5F0E25EC3B0, 0xD021FF5CD13A2ED5,
0x40BDF15D4A672E32, 0x011355146FD56395, 0x5DB4832046F3D9E5, 0x239F8B2D7FF719CC,
0x05D1A1AE85B49AA1, 0x679F848F6E8FC971, 0x7449BBFF801FED0B, 0x7D11CDB1C3B7ADF0,
0x82C7709E781EB7CC, 0xF3218F1C9510786C, 0x331478F3AF51BBE6, 0x4BB38DE5E7219443,
0xAA649C6EBCFD50FC, 0x8DBD98A352AFD40B, 0x87D2074B81D79217, 0x19F3C751D3E92AE1,
0xB4AB30F062B19ABF, 0x7B0500AC42047AC4, 0xC9452CA81A09D85D, 0x24AA6C514DA27500,
0x4C9F34427501B447, 0x14A68FD73C910841, 0xA71B9B83461CBD93, 0x03488B95B0F1850F,
0x637B2B34FF93C040, 0x09D1BC9A3DD90A94, 0x3575668334A1DD3B, 0x735E2B97A4C45A23,
0x18727070F1BD400B, 0x1FCBACD259BF02E7, 0xD310A7C2CE9B6555, 0xBF983FE0FE5D8244,
0x9F74D14F7454A824, 0x51EBDC4AB9BA3035, 0x5C82C505DB9AB0FA, 0xFCF7FE8A3430B241,
0x3253A729B9BA3DDE, 0x8C74C368081B3075, 0xB9BC6C87167C33E7, 0x7EF48F2B83024E20,
0x11D505D4C351BD7F, 0x6568FCA92C76A243, 0x4DE0B0F40F32A7B8, 0x96D693460CC37E5D,
0x42E240CB63689F2F, 0x6D2BDCDAE2919661, 0x42880B0236E4D951, 0x5F0F4A5898171BB6,
0x39F890F579F92F88, 0x93C5B5F47356388B, 0x63DC359D8D231B78, 0xEC16CA8AEA98AD76,
0x5355F900C2A82DC7, 0x07FB9F855A997142, 0x5093417AA8A7ED5E, 0x7BCBC38DA25A7F3C,
0x19FC8A768CF4B6D4, 0x637A7780DECFC0D9, 0x8249A47AEE0E41F7, 0x79AD695501E7D1E8,
0x14ACBAF4777D5776, 0xF145B6BECCDEA195, 0xDABF2AC8201752FC, 0x24C3C94DF9C8D3F6,
0xBB6E2924F03912EA, 0x0CE26C0B95C980D9, 0xA49CD132BFBF7CC4, 0xE99D662AF4243939,
0x27E6AD7891165C3F, 0x8535F040B9744FF1, 0x54B3F4FA5F40D873, 0x72B12C32127FED2B,
0xEE954D3C7B411F47, 0x9A85AC909A24EAA1, 0x70AC4CD9F04F21F5, 0xF9B89D3E99A075C2,
0x87B3E2B2B5C907B1, 0xA366E5B8C54F48B8, 0xAE4A9346CC3F7CF2, 0x1920C04D47267BBD,
0x87BF02C6B49E2AE9, 0x092237AC237F3859, 0xFF07F64EF8ED14D0, 0x8DE8DCA9F03CC54E,
0x9C1633264DB49C89, 0xB3F22C3D0B0B38ED, 0x390E5FB44D01144B, 0x5BFEA5B4712768E9,
0x1E1032911FA78984, 0x9A74ACB964E78CB3, 0x4F80F7A035DAFB04, 0x6304D09A0B3738C4,
0x2171E64683023A08, 0x5B9B63EB9CEFF80C, 0x506AACF489889342, 0x1881AFC9A3A701D6,
0x6503080440750644, 0xDFD395339CDBF4A7, 0xEF927DBCF00C20F2, 0x7B32F7D1E03680EC,
0xB9FD7620E7316243, 0x05A7E8A57DB91B77, 0xB5889C6E15630A75, 0x4A750A09CE9573F7,
0xCF464CEC899A2F8A, 0xF538639CE705B824, 0x3C79A0FF5580EF7F, 0xEDE6C87F8477609D,
0x799E81F05BC93F31, 0x86536B8CF3428A8C, 0x97D7374C60087B73, 0xA246637CFF328532,
0x043FCAE60CC0EBA0, 0x920E449535DD359E, 0x70EB093B15B290CC, 0x73A1921916591CBD,
0x56436C9FE1A1AA8D, 0xEFAC4B70633B8F81, 0xBB215798D45DF7AF, 0x45F20042F24F1768,
0x930F80F4E8EB7462, 0xFF6712FFCFD75EA1, 0xAE623FD67468AA70, 0xDD2C5BC84BC8D8FC,
0x7EED120D54CF2DD9, 0x22FE545401165F1C, 0xC91800E98FB99929, 0x808BD68E6AC10365,
0xDEC468145B7605F6, 0x1BEDE3A3AEF53302, 0x43539603D6C55602, 0xAA969B5C691CCB7A,
0xA87832D392EFEE56, 0x65942C7B3C7E11AE, 0xDED2D633CAD004F6, 0x21F08570F420E565,
0xB415938D7DA94E3C, 0x91B859E59ECB6350, 0x10CFF333E0ED804A, 0x28AED140BE0BB7DD,
0xC5CC1D89724FA456, 0x5648F680F11A2741, 0x2D255069F0B7DAB3, 0x9BC5A38EF729ABD4,
0xEF2F054308F6A2BC, 0xAF2042F5CC5C2858, 0x480412BAB7F5BE2A, 0xAEF3AF4A563DFE43,
0x19AFE59AE451497F, 0x52593803DFF1E840, 0xF4F076E65F2CE6F0, 0x11379625747D5AF3,
0xBCE5D2248682C115, 0x9DA4243DE836994F, 0x066F70B33FE09017, 0x4DC4DE189B671A1C,
0x51039AB7712457C3, 0xC07A3F80C31FB4B4, 0xB46EE9C5E64A6E7C, 0xB3819A42ABE61C87,
0x21A007933A522A20, 0x2DF16F761598AA4F, 0x763C4A1371B368FD, 0xF793C46702E086A0,
0xD7288E012AEB8D31, 0xDE336A2A4BC1C44B, 0x0BF692B38D079F23, 0x2C604A7A177326B3,
0x4850E73E03EB6064, 0xCFC447F1E53C8E1B, 0xB05CA3F564268D99, 0x9AE182C8BC9474E8,
0xA4FC4BD4FC5558CA, 0xE755178D58FC4E76, 0x69B97DB1A4C03DFE, 0xF9B5B7C4ACC67C96,
0xFC6A82D64B8655FB, 0x9C684CB6C4D24417, 0x8EC97D2917456ED0, 0x6703DF9D2924E97E,
0xC547F57E42A7444E, 0x78E37644E7CAD29E, 0xFE9A44E9362F05FA, 0x08BD35CC38336615,
0x9315E5EB3A129ACE, 0x94061B871E04DF75, 0xDF1D9F9D784BA010, 0x3BBA57B68871B59D,
0xD2B7ADEEDED1F73F, 0xF7A255D83BC373F8, 0xD7F4F2448C0CEB81, 0xD95BE88CD210FFA7,
0x336F52F8FF4728E7, 0xA74049DAC312AC71, 0xA2F61BB6E437FDB5, 0x4F2A5CB07F6A35B3,
0x87D380BDA5BF7859, 0x16B9F7E06C453A21, 0x7BA2484C8A0FD54E, 0xF3A678CAD9A2E38C,
0x39B0BF7DDE437BA2, 0xFCAF55C1BF8A4424, 0x18FCF680573FA594, 0x4C0563B89F495AC3,
0x40E087931A00930D, 0x8CFFA9412EB642C1, 0x68CA39053261169F, 0x7A1EE967D27579E2,
0x9D1D60E5076F5B6F, 0x3810E399B6F65BA2, 0x32095B6D4AB5F9B1, 0x35CAB62109DD038A,
0xA90B24499FCFAFB1, 0x77A225A07CC2C6BD, 0x513E5E634C70E331, 0x4361C0CA3F692F12,
0xD941ACA44B20A45B, 0x528F7C8602C5807B, 0x52AB92BEB9613989, 0x9D1DFA2EFC557F73,
0x722FF175F572C348, 0x1D1260A51107FE97, 0x7A249A57EC0C9BA2, 0x04208FE9E8F7F2D6,
0x5A110C6058B920A0, 0x0CD9A497658A5698, 0x56FD23C8F9715A4C, 0x284C847B9D887AAE,
0x04FEABFBBDB619CB, 0x742E1E651C60BA83, 0x9A9632E65904AD3C, 0x881B82A13B51B9E2,
0x506E6744CD974924, 0xB0183DB56FFC6A79, 0x0ED9B915C66ED37E, 0x5E11E86D5873D484,
0xF678647E3519AC6E, 0x1B85D488D0F20CC5, 0xDAB9FE6525D89021, 0x0D151D86ADB73615,
0xA865A54EDCC0F019, 0x93C42566AEF98FFB, 0x99E7AFEABE000731, 0x48CBFF086DDF285A,
0x7F9B6AF1EBF78BAF, 0x58627E1A149BBA21, 0x2CD16E2ABD791E33, 0xD363EFF5F0977996,
0x0CE2A38C344A6EED, 0x1A804AADB9CFA741, 0x907F30421D78C5DE, 0x501F65EDB3034D07,
0x37624AE5A48FA6E9, 0x957BAF61700CFF4E, 0x3A6C27934E31188A, 0xD49503536ABCA345,
0x088E049589C432E0, 0xF943AEE7FEBF21B8, 0x6C3B8E3E336139D3, 0x364F6FFA464EE52E,
0xD60F6DCEDC314222, 0x56963B0DCA418FC0, 0x16F50EDF91E513AF, 0xEF1955914B609F93,
0x565601C0364E3228, 0xECB53939887E8175, 0xBAC7A9A18531294B, 0xB344C470397BBA52,
0x65D34954DAF3CEBD, 0xB4B81B3FA97511E2, 0xB422061193D6F6A7, 0x071582401C38434D,
0x7A13F18BBEDC4FF5, 0xBC4097B116C524D2, 0x59B97885E2F2EA28, 0x99170A5DC3115544,
0x6F423357E7C6A9F9, 0x325928EE6E6F8794, 0xD0E4366228B03343, 0x565C31F7DE89EA27,
0x30F5611484119414, 0xD873DB391292ED4F, 0x7BD94E1D8E17DEBC, 0xC7D9F16864A76E94,
0x947AE053EE56E63C, 0xC8C93882F9475F5F, 0x3A9BF55BA91F81CA, 0xD9A11FBB3D9808E4,
0x0FD22063EDC29FCA, 0xB3F256D8ACA0B0B9, 0xB03031A8B4516E84, 0x35DD37D5871448AF,
0xE9F6082B05542E4E, 0xEBFAFA33D7254B59, 0x9255ABB50D532280, 0xB9AB4CE57F2D34F3,
0x693501D628297551, 0xC62C58F97DD949BF, 0xCD454F8F19C5126A, 0xBBE83F4ECC2BDECB,
0xDC842B7E2819E230, 0xBA89142E007503B8, 0xA3BC941D0A5061CB, 0xE9F6760E32CD8021,
0x09C7E552BC76492F, 0x852F54934DA55CC9, 0x8107FCCF064FCF56, 0x098954D51FFF6580,
0x23B70EDB1955C4BF, 0xC330DE426430F69D, 0x4715ED43E8A45C0A, 0xA8D7E4DAB780A08D,
0x0572B974F03CE0BB, 0xB57D2E985E1419C7, 0xE8D9ECBE2CF3D73F, 0x2FE4B17170E59750,
0x11317BA87905E790, 0x7FBF21EC8A1F45EC, 0x1725CABFCB045B00, 0x964E915CD5E2B207,
0x3E2B8BCBF016D66D, 0xBE7444E39328A0AC, 0xF85B2B4FBCDE44B7, 0x49353FEA39BA63B1,
0x1DD01AAFCD53486A, 0x1FCA8A92FD719F85, 0xFC7C95D827357AFA, 0x18A6A990C8B35EBD,
0xCCCB7005C6B9C28D, 0x3BDBB92C43B17F26, 0xAA70B5B4F89695A2, 0xE94C39A54A98307F,
0xB7A0B174CFF6F36E, 0xD4DBA84729AF48AD, 0x2E18BC1AD9704A68, 0x2DE0966DAF2F8B1C,
0xB9C11D5B1E43A07E, 0x64972D68DEE33360, 0x94628D38D0C20584, 0xDBC0D2B6AB90A559,
0xD2733C4335C6A72F, 0x7E75D99D94A70F4D, 0x6CED1983376FA72B, 0x97FCAACBF030BC24,
0x7B77497B32503B12, 0x8547EDDFB81CCB94, 0x79999CDFF70902CB, 0xCFFE1939438E9B24,
0x829626E3892D95D7, 0x92FAE24291F2B3F1, 0x63E22C147B9C3403, 0xC678B6D860284A1C,
0x5873888850659AE7, 0x0981DCD296A8736D, 0x9F65789A6509A440, 0x9FF38FED72E9052F,
0xE479EE5B9930578C, 0xE7F28ECD2D49EECD, 0x56C074A581EA17FE, 0x5544F7D774B14AEF,
0x7B3F0195FC6F290F, 0x12153635B2C0CF57, 0x7F5126DBBA5E0CA7, 0x7A76956C3EAFB413,
0x3D5774A11D31AB39, 0x8A1B083821F40CB4, 0x7B4A38E32537DF62, 0x950113646D1D6E03,
0x4DA8979A0041E8A9, 0x3BC36E078F7515D7, 0x5D0A12F27AD310D1, 0x7F9D1A2E1EBE1327,
0xDA3A361B1C5157B1, 0xDCDD7D20903D0C25, 0x36833336D068F707, 0xCE68341F79893389,
0xAB9090168DD05F34, 0x43954B3252DC25E5, 0xB438C2B67F98E5E9, 0x10DCD78E3851A492,
0xDBC27AB5447822BF, 0x9B3CDB65F82CA382, 0xB67B7896167B4C84, 0xBFCED1B0048EAC50,
0xA9119B60369FFEBD, 0x1FFF7AC80904BF45, 0xAC12FB171817EEE7, 0xAF08DA9177DDA93D,
0x1B0CAB936E65C744, 0xB559EB1D04E5E932, 0xC37B45B3F8D6F2BA, 0xC3A9DC228CAAC9E9,
0xF3B8B6675A6507FF, 0x9FC477DE4ED681DA, 0x67378D8ECCEF96CB, 0x6DD856D94D259236,
0xA319CE15B0B4DB31, 0x073973751F12DD5E, 0x8A8E849EB32781A5, 0xE1925C71285279F5,
0x74C04BF1790C0EFE, 0x4DDA48153C94938A, 0x9D266D6A1CC0542C, 0x7440FB816508C4FE,
0x13328503DF48229F, 0xD6BF7BAEE43CAC40, 0x4838D65F6EF6748F, 0x1E152328F3318DEA,
0x8F8419A348F296BF, 0x72C8834A5957B511, 0xD7A023A73260B45C, 0x94EBC8ABCFB56DAE,
0x9FC10D0F989993E0, 0xDE68A2355B93CAE6, 0xA44CFE79AE538BBE, 0x9D1D84FCCE371425,
0x51D2B1AB2DDFB636, 0x2FD7E4B9E72CD38C, 0x65CA5B96B7552210, 0xDD69A0D8AB3B546D,
0x604D51B25FBF70E2, 0x73AA8A564FB7AC9E, 0x1A8C1E992B941148, 0xAAC40A2703D9BEA0,
0x764DBEAE7FA4F3A6, 0x1E99B96E70A9BE8B, 0x2C5E9DEB57EF4743, 0x3A938FEE32D29981,
0x26E6DB8FFDF5ADFE, 0x469356C504EC9F9D, 0xC8763C5B08D1908C, 0x3F6C6AF859D80055,
0x7F7CC39420A3A545, 0x9BFB227EBDF4C5CE, 0x89039D79D6FC5C5C, 0x8FE88B57305E2AB6,
0xA09E8C8C35AB96DE, 0xFA7E393983325753, 0xD6B6D0ECC617C699, 0xDFEA21EA9E7557E3,
0xB67C1FA481680AF8, 0xCA1E3785A9E724E5, 0x1CFC8BED0D681639, 0xD18D8549D140CAEA,
0x4ED0FE7E9DC91335, 0xE4DBF0634473F5D2, 0x1761F93A44D5AEFE, 0x53898E4C3910DA55,
0x734DE8181F6EC39A, 0x2680B122BAA28D97, 0x298AF231C85BAFAB, 0x7983EED3740847D5,
0x66C1A2A1A60CD889, 0x9E17E49642A3E4C1, 0xEDB454E7BADC0805, 0x50B704CAB602C329,
0x4CC317FB9CDDD023, 0x66B4835D9EAFEA22, 0x219B97E26FFC81BD, 0x261E4E4C0A333A9D,
0x1FE2CCA76517DB90, 0xD7504DFA8816EDBB, 0xB9571FA04DC089C8, 0x1DDC0325259B27DE,
0xCF3F4688801EB9AA, 0xF4F5D05C10CAB243, 0x38B6525C21A42B0E, 0x36F60E2BA4FA6800,
0xEB3593803173E0CE, 0x9C4CD6257C5A3603, 0xAF0C317D32ADAA8A, 0x258E5A80C7204C4B,
0x8B889D624D44885D, 0xF4D14597E660F855, 0xD4347F66EC8941C3, 0xE699ED85B0DFB40D,
0x2472F6207C2D0484, 0xC2A1E7B5B459AEB5, 0xAB4F6451CC1D45EC, 0x63767572AE3D6174,
0xA59E0BD101731A28, 0x116D0016CB948F09, 0x2CF9C8CA052F6E9F, 0x0B090A7560A968E3,
0xABEEDDB2DDE06FF1, 0x58EFC10B06A2068D, 0xC6E57A78FBD986E0, 0x2EAB8CA63CE802D7,
0x14A195640116F336, 0x7C0828DD624EC390, 0xD74BBE77E6116AC7, 0x804456AF10F5FB53,
0xEBE9EA2ADF4321C7, 0x03219A39EE587A30, 0x49787FEF17AF9924, 0xA1E9300CD8520548,
0x5B45E522E4B1B4EF, 0xB49C3B3995091A36, 0xD4490AD526F14431, 0x12A8F216AF9418C2,
0x001F837CC7350524, 0x1877B51E57A764D5, 0xA2853B80F17F58EE, 0x993E1DE72D36D310,
0xB3598080CE64A656, 0x252F59CF0D9F04BB, 0xD23C8E176D113600, 0x1BDA0492E7E4586E,
0x21E0BD5026C619BF, 0x3B097ADAF088F94E, 0x8D14DEDB30BE846E, 0xF95CFFA23AF5F6F4,
0x3871700761B3F743, 0xCA672B91E9E4FA16, 0x64C8E531BFF53B55, 0x241260ED4AD1E87D,
0x106C09B972D2E822, 0x7FBA195410E5CA30, 0x7884D9BC6CB569D8, 0x0647DFEDCD894A29,
0x63573FF03E224774, 0x4FC8E9560F91B123, 0x1DB956E450275779, 0xB8D91274B9E9D4FB,
0xA2EBEE47E2FBFCE1, 0xD9F1F30CCD97FB09, 0xEFED53D75FD64E6B, 0x2E6D02C36017F67F,
0xA9AA4D20DB084E9B, 0xB64BE8D8B25396C1, 0x70CB6AF7C2D5BCF0, 0x98F076A4F7A2322E,
0xBF84470805E69B5F, 0x94C3251F06F90CF3, 0x3E003E616A6591E9, 0xB925A6CD0421AFF3,
0x61BDD1307C66E300, 0xBF8D5108E27E0D48, 0x240AB57A8B888B20, 0xFC87614BAF287E07,
0xEF02CDD06FFDB432, 0xA1082C0466DF6C0A, 0x8215E577001332C8, 0xD39BB9C3A48DB6CF,
0x2738259634305C14, 0x61CF4F94C97DF93D, 0x1B6BACA2AE4E125B, 0x758F450C88572E0B,
0x959F587D507A8359, 0xB063E962E045F54D, 0x60E8ED72C0DFF5D1, 0x7B64978555326F9F,
0xFD080D236DA814BA, 0x8C90FD9B083F4558, 0x106F72FE81E2C590, 0x7976033A39F7D952,
0xA4EC0132764CA04B, 0x733EA705FAE4FA77, 0xB4D8F77BC3E56167, 0x9E21F4F903B33FD9,
0x9D765E419FB69F6D, 0xD30C088BA61EA5EF, 0x5D94337FBFAF7F5B, 0x1A4E4822EB4D7A59,
0x6FFE73E81B637FB3, 0xDDF957BC36D8B9CA, 0x64D0E29EEA8838B3, 0x08DD9BDFD96B9F63,
0x087E79E5A57D1D13, 0xE328E230E3E2B3FB, 0x1C2559E30F0946BE, 0x720BF5F26F4D2EAA,
0xB0774D261CC609DB, 0x443F64EC5A371195, 0x4112CF68649A260E, 0xD813F2FAB7F5C5CA,
0x660D3257380841EE, 0x59AC2C7873F910A3, 0xE846963877671A17, 0x93B633ABFA3469F8,
0xC0C0F5A60EF4CDCF, 0xCAF21ECD4377B28C, 0x57277707199B8175, 0x506C11B9D90E8B1D,
0xD83CC2687A19255F, 0x4A29C6465A314CD1, 0xED2DF21216235097, 0xB5635C95FF7296E2,
0x22AF003AB672E811, 0x52E762596BF68235, 0x9AEBA33AC6ECC6B0, 0x944F6DE09134DFB6,
0x6C47BEC883A7DE39, 0x6AD047C430A12104, 0xA5B1CFDBA0AB4067, 0x7C45D833AFF07862,
0x5092EF950A16DA0B, 0x9338E69C052B8E7B, 0x455A4B4CFE30E3F5, 0x6B02E63195AD0CF8,
0x6B17B224BAD6BF27, 0xD1E0CCD25BB9C169, 0xDE0C89A556B9AE70, 0x50065E535A213CF6,
0x9C1169FA2777B874, 0x78EDEFD694AF1EED, 0x6DC93D9526A50E68, 0xEE97F453F06791ED,
0x32AB0EDB696703D3, 0x3A6853C7E70757A7, 0x31865CED6120F37D, 0x67FEF95D92607890,
0x1F2B1D1F15F6DC9C, 0xB69E38A8965C6B65, 0xAA9119FF184CCCF4, 0xF43C732873F24C13,
0xFB4A3D794A9A80D2, 0x3550C2321FD6109C, 0x371F77E76BB8417E, 0x6BFA9AAE5EC05779,
0xCD04F3FF001A4778, 0xE3273522064480CA, 0x9F91508BFFCFC14A, 0x049A7F41061A9E60,
0xFCB6BE43A9F2FE9B, 0x08DE8A1C7797DA9B, 0x8F9887E6078735A1, 0xB5B4071DBFC73A66,
0x230E343DFBA08D33, 0x43ED7F5A0FAE657D, 0x3A88A0FBBCB05C63, 0x21874B8B4D2DBC4F,
0x1BDEA12E35F6A8C9, 0x53C065C6C8E63528, 0xE34A1D250E7A8D6B, 0xD6B04D3B7651DD7E,
0x5E90277E7CB39E2D, 0x2C046F22062DC67D, 0xB10BB459132D0A26, 0x3FA9DDFB67E2F199,
0x0E09B88E1914F7AF, 0x10E8B35AF3EEAB37, 0x9EEDECA8E272B933, 0xD4C718BC4AE8AE5F,
0x81536D601170FC20, 0x91B534F885818A06, 0xEC8177F83F900978, 0x190E714FADA5156E,
0xB592BF39B0364963, 0x89C350C893AE7DC1, 0xAC042E70F8B383F2, 0xB49B52E587A1EE60,
0xFB152FE3FF26DA89, 0x3E666E6F69AE2C15, 0x3B544EBE544C19F9, 0xE805A1E290CF2456,
0x24B33C9D7ED25117, 0xE74733427B72F0C1, 0x0A804D18B7097475, 0x57E3306D881EDB4F,
0x4AE7D6A36EB5DBCB, 0x2D8D5432157064C8, 0xD1E649DE1E7F268B, 0x8A328A1CEDFE552C,
0x07A3AEC79624C7DA, 0x84547DDC3E203C94, 0x990A98FD5071D263, 0x1A4FF12616EEFC89,
0xF6F7FD1431714200, 0x30C05B1BA332F41C, 0x8D2636B81555A786, 0x46C9FEB55D120902,
0xCCEC0A73B49C9921, 0x4E9D2827355FC492, 0x19EBB029435DCB0F, 0x4659D2B743848A2C,
0x963EF2C96B33BE31, 0x74F85198B05A2E7D, 0x5A0F544DD2B1FB18, 0x03727073C2E134B1,
0xC7F6AA2DE59AEA61, 0x352787BAA0D7C22F, 0x9853EAB63B5E0B35, 0xABBDCDD7ED5C0860,
0xCF05DAF5AC8D77B0, 0x49CAD48CEBF4A71E, 0x7A4C10EC2158C4A6, 0xD9E92AA246BF719E,
0x13AE978D09FE5557, 0x730499AF921549FF, 0x4E4B705B92903BA4, 0xFF577222C14F0A3A,
0x55B6344CF97AAFAE, 0xB862225B055B6960, 0xCAC09AFBDDD2CDB4, 0xDAF8E9829FE96B5F,
0xB5FDFC5D3132C498, 0x310CB380DB6F7503, 0xE87FBB46217A360E, 0x2102AE466EBB1148,
0xF8549E1A3AA5E00D, 0x07A69AFDCC42261A, 0xC4C118BFE78FEAAE, 0xF9F4892ED96BD438,
0x1AF3DBE25D8F45DA, 0xF5B4B0B0D2DEEEB4, 0x962ACEEFA82E1C84, 0x046E3ECAAF453CE9,
0xF05D129681949A4C, 0x964781CE734B3C84, 0x9C2ED44081CE5FBD, 0x522E23F3925E319E,
0x177E00F9FC32F791, 0x2BC60A63A6F3B3F2, 0x222BBFAE61725606, 0x486289DDCC3D6780,
0x7DC7785B8EFDFC80, 0x8AF38731C02BA980, 0x1FAB64EA29A2DDF7, 0xE4D9429322CD065A,
0x9DA058C67844F20C, 0x24C0E332B70019B0, 0x233003B5A6CFE6AD, 0xD586BD01C5C217F6,
0x5E5637885F29BC2B, 0x7EBA726D8C94094B, 0x0A56A5F0BFE39272, 0xD79476A84EE20D06,
0x9E4C1269BAA4BF37, 0x17EFEE45B0DEE640, 0x1D95B0A5FCF90BC6, 0x93CBE0B699C2585D,
0x65FA4F227A2B6D79, 0xD5F9E858292504D5, 0xC2B5A03F71471A6F, 0x59300222B4561E00,
0xCE2F8642CA0712DC, 0x7CA9723FBB2E8988, 0x2785338347F2BA08, 0xC61BB3A141E50E8C,
0x150F361DAB9DEC26, 0x9F6A419D382595F4, 0x64A53DC924FE7AC9, 0x142DE49FFF7A7C3D,
0x0C335248857FA9E7, 0x0A9C32D5EAE45305, 0xE6C42178C4BBB92E, 0x71F1CE2490D20B07,
0xF1BCC3D275AFE51A, 0xE728E8C83C334074, 0x96FBF83A12884624, 0x81A1549FD6573DA5,
0x5FA7867CAF35E149, 0x56986E2EF3ED091B, 0x917F1DD5F8886C61, 0xD20D8C88C8FFE65F,
0x31D71DCE64B2C310, 0xF165B587DF898190, 0xA57E6339DD2CF3A0, 0x1EF6E6DBB1961EC9,
0x70CC73D90BC26E24, 0xE21A6B35DF0C3AD7, 0x003A93D8B2806962, 0x1C99DED33CB890A1,
0xCF3145DE0ADD4289, 0xD0E4427A5514FB72, 0x77C621CC9FB3A483, 0x67A34DAC4356550B,
0xF8D626AAAF278509
]
class Piece(object):
"""A piece with type and color."""
def __init__(self, piece_type, color):
self.piece_type = piece_type
self.color = color
def symbol(self):
"""
Gets the symbol ``P``, ``N``, ``B``, ``R``, ``Q`` or ``K`` for white
pieces or the lower-case variants for the black pieces.
"""
if self.color == WHITE:
return PIECE_SYMBOLS[self.piece_type].upper()
else:
return PIECE_SYMBOLS[self.piece_type]
def unicode_symbol(self, invert_color=False):
"""
Gets the unicode character for the piece.
"""
if not invert_color:
return UNICODE_PIECE_SYMBOLS[self.symbol()]
else:
return UNICODE_PIECE_SYMBOLS[self.symbol().swapcase()]
def __hash__(self):
return hash(self.piece_type * (self.color + 1))
def __repr__(self):
return "Piece.from_symbol('{0}')".format(self.symbol())
def __str__(self):
return self.symbol()
def __unicode__(self, invert_color=False):
return self.unicode_symbol(invert_color)
def __eq__(self, other):
try:
return self.piece_type == other.piece_type and self.color == other.color
except AttributeError:
return False
def __ne__(self, other):
return not self.__eq__(other)
@classmethod
def from_symbol(cls, symbol):
"""
Creates a piece instance from a piece symbol.
Raises :exc:`ValueError` if the symbol is invalid.
"""
if symbol.islower():
return cls(PIECE_SYMBOLS.index(symbol), BLACK)
else:
return cls(PIECE_SYMBOLS.index(symbol.lower()), WHITE)
class Move(object):
"""
Represents a move from a square to a square and possibly the promotion
piece type.
Null moves are supported.
"""
def __init__(self, from_square, to_square, promotion=None):
self.from_square = from_square
self.to_square = to_square
self.promotion = promotion
def uci(self):
"""
Gets an UCI string for the move.
For example a move from A7 to A8 would be ``a7a8`` or ``a7a8q`` if it
is a promotion to a queen.
The UCI representatin of null moves is ``0000``.
"""
if self.promotion:
return SQUARE_NAMES[self.from_square] + SQUARE_NAMES[self.to_square] + PIECE_SYMBOLS[self.promotion]
elif self:
return SQUARE_NAMES[self.from_square] + SQUARE_NAMES[self.to_square]
else:
return "0000"
def __bool__(self):
return bool(self.from_square or self.to_square or self.promotion)
__nonzero__ = __bool__
def __eq__(self, other):
try:
return self.from_square == other.from_square and self.to_square == other.to_square and self.promotion == other.promotion
except AttributeError:
return False
def __ne__(self, other):
return not self.__eq__(other)
def __repr__(self):
return "Move.from_uci('{0}')".format(self.uci())
def __str__(self):
return self.uci()
def __hash__(self):
if self.promotion:
return hash(self.to_square ^ self.from_square << 6 ^ self.promotion << 12)
else:
return hash(self.to_square ^ self.from_square << 6)
@classmethod
def from_uci(cls, uci):
"""
Parses an UCI string.
Raises :exc:`ValueError` if the UCI string is invalid.
"""
if uci == "0000":
return cls.null()
elif len(uci) == 4:
return cls(SQUARE_NAMES.index(uci[0:2]), SQUARE_NAMES.index(uci[2:4]))
elif len(uci) == 5:
promotion = PIECE_SYMBOLS.index(uci[4])
return cls(SQUARE_NAMES.index(uci[0:2]), SQUARE_NAMES.index(uci[2:4]), promotion)
else:
raise ValueError("expected uci string to be of length 4 or 5: {0}".format(repr(uci)))
@classmethod
def null(cls):
"""
Gets a null move.
A null move just passes the turn to the other side (and possibly
forfeits en passant capturing). Null moves evaluate to ``False`` in
boolean contexts.
>>> bool(chess.Move.null())
False
"""
return cls(0, 0, None)
class Board(object):
"""
A board and additional information representing a position.
Provides move generation, validation, parsing, attack generation,
game end detection, move counters and the capability to make and unmake
moves.
The board is initialized to the starting position, unless otherwise
specified in the optional *fen* argument. If *fen* is ``None`` an empty
board is created.
Optionally supports *chess960*. In Chess960 castling moves are encoded
by a king move to the corresponding rook square.
"""
def __init__(self, fen=STARTING_FEN, chess960=False):
self.chess960 = chess960
self.pseudo_legal_moves = PseudoLegalMoveGenerator(self)
self.legal_moves = LegalMoveGenerator(self)
self.occupied_co = [BB_VOID, BB_VOID]
self.attacks_valid = False
self.attacks_from = collections.defaultdict(int)
self.attacks_to = collections.defaultdict(int)
self.attacks_valid_stack = collections.deque()
self.attacks_from_stack = collections.deque()
self.attacks_to_stack = collections.deque()
self.halfmove_clock_stack = collections.deque()
self.captured_piece_stack = collections.deque()
self.castling_right_stack = collections.deque()
self.ep_square_stack = collections.deque()
self.move_stack = collections.deque()
self.transpositions = collections.Counter()
if fen is None:
self.clear()
elif fen == STARTING_FEN:
self.reset()
else:
self.set_fen(fen)
def reset(self):
"""Restores the starting position."""
self.pawns = BB_RANK_2 | BB_RANK_7
self.knights = BB_B1 | BB_G1 | BB_B8 | BB_G8
self.bishops = BB_C1 | BB_F1 | BB_C8 | BB_F8
self.rooks = BB_A1 | BB_H1 | BB_A8 | BB_H8
self.queens = BB_D1 | BB_D8
self.kings = BB_E1 | BB_E8
self.occupied_co[WHITE] = BB_RANK_1 | BB_RANK_2
self.occupied_co[BLACK] = BB_RANK_7 | BB_RANK_8
self.occupied = BB_RANK_1 | BB_RANK_2 | BB_RANK_7 | BB_RANK_8
self.ep_square = 0
self.castling_rights = BB_A1 | BB_H1 | BB_A8 | BB_H8
self.turn = WHITE
self.fullmove_number = 1
self.halfmove_clock = 0
self.incremental_zobrist_hash = self.board_zobrist_hash(POLYGLOT_RANDOM_ARRAY)
self.halfmove_clock_stack.clear()
self.captured_piece_stack.clear()
self.castling_right_stack.clear()
self.ep_square_stack.clear()
self.move_stack.clear()
self.transpositions.clear()
self.transpositions.update((self.zobrist_hash(), ))
self.attacks_valid = False
self.clear_stack()
def clear(self):
"""
Clears the board.
Resets move stacks and move counters. The side to move is white. There
are no rooks or kings, so castling rights are removed.
In order to be in a valid :func:`~chess.Board.status()` at least kings
need to be put on the board.
"""
self.pawns = BB_VOID
self.knights = BB_VOID
self.bishops = BB_VOID
self.rooks = BB_VOID
self.queens = BB_VOID
self.kings = BB_VOID
self.occupied_co[WHITE] = BB_VOID
self.occupied_co[BLACK] = BB_VOID
self.occupied = BB_VOID
self.ep_square = 0
self.castling_rights = BB_VOID
self.turn = WHITE
self.fullmove_number = 1
self.halfmove_clock = 0
self.incremental_zobrist_hash = self.board_zobrist_hash(POLYGLOT_RANDOM_ARRAY)
self.attacks_valid = False
self.clear_stack()
def clear_stack(self):
"""Clears the move stack and transposition table."""
self.halfmove_clock_stack.clear()
self.captured_piece_stack.clear()
self.castling_right_stack.clear()
self.ep_square_stack.clear()
self.move_stack.clear()
self.transpositions.clear()
self.transpositions.update((self.zobrist_hash(), ))
self.attacks_valid_stack.clear()
self.attacks_from_stack.clear()
self.attacks_to_stack.clear()
def pieces_mask(self, piece_type, color):
if piece_type == PAWN:
bb = self.pawns
elif piece_type == KNIGHT:
bb = self.knights
elif piece_type == BISHOP:
bb = self.bishops
elif piece_type == ROOK:
bb = self.rooks
elif piece_type == QUEEN:
bb = self.queens
elif piece_type == KING:
bb = self.kings
return bb & self.occupied_co[color]
def pieces(self, piece_type, color):
"""
Gets pieces of the given type and color.
Returns a :class:`set of squares <chess.SquareSet>`.
"""
return SquareSet(self.pieces_mask(piece_type, color))
def piece_at(self, square):
"""Gets the :class:`piece <chess.Piece>` at the given square."""
piece_type = self.piece_type_at(square)
if piece_type:
mask = BB_SQUARES[square]
color = bool(self.occupied_co[WHITE] & mask)
return Piece(piece_type, color)
def piece_type_at(self, square):
"""Gets the piece type at the given square."""
mask = BB_SQUARES[square]
if self.pawns & mask:
return PAWN
elif self.knights & mask:
return KNIGHT
elif self.bishops & mask:
return BISHOP
elif self.rooks & mask:
return ROOK
elif self.queens & mask:
return QUEEN
elif self.kings & mask:
return KING
else:
return None
def _remove_piece_at(self, square):
mask = BB_SQUARES[square]
if not self.occupied & mask:
return
piece_type = self.piece_type_at(square)
if piece_type == PAWN:
self.pawns ^= mask
elif piece_type == KNIGHT:
self.knights ^= mask
elif piece_type == BISHOP:
self.bishops ^= mask
elif piece_type == ROOK:
self.rooks ^= mask
elif piece_type == QUEEN:
self.queens ^= mask
else:
self.kings ^= mask
color = bool(self.occupied_co[WHITE] & mask)
self.occupied ^= mask
self.occupied_co[color] ^= mask
# Update incremental zobrist hash.
if color == BLACK:
piece_index = (piece_type - 1) * 2
else:
piece_index = (piece_type - 1) * 2 + 1
self.incremental_zobrist_hash ^= POLYGLOT_RANDOM_ARRAY[64 * piece_index + 8 * rank_index(square) + file_index(square)]
def remove_piece_at(self, square):
"""Removes a piece from the given square if present."""
self._remove_piece_at(square)
self.clear_stack()
self.attacks_valid = False
def _set_piece_at(self, square, piece_type, color):
self._remove_piece_at(square)
mask = BB_SQUARES[square]
if piece_type == PAWN:
self.pawns |= mask
elif piece_type == KNIGHT:
self.knights |= mask
elif piece_type == BISHOP:
self.bishops |= mask
elif piece_type == ROOK:
self.rooks |= mask
elif piece_type == QUEEN:
self.queens |= mask
elif piece_type == KING:
self.kings |= mask
self.occupied ^= mask
self.occupied_co[color] ^= mask
# Update incremental zobrist hash.
if color == BLACK:
piece_index = (piece_type - 1) * 2
else:
piece_index = (piece_type - 1) * 2 + 1