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test.py
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#!/usr/bin/env python3
#
# This file is part of the python-chess library.
# Copyright (C) 2012-2021 Niklas Fiekas <[email protected]>
#
# 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/>.
import asyncio
import copy
import logging
import os
import os.path
import platform
import sys
import tempfile
import textwrap
import unittest
import io
import chess
import chess.gaviota
import chess.engine
import chess.pgn
import chess.polyglot
import chess.svg
import chess.syzygy
import chess.variant
class RaiseLogHandler(logging.StreamHandler):
def handle(self, record):
super().handle(record)
raise RuntimeError("was expecting no log messages")
def catchAndSkip(signature, message=None):
def _decorator(f):
def _wrapper(self):
try:
return f(self)
except signature as err:
raise unittest.SkipTest(message or err)
return _wrapper
return _decorator
class SquareTestCase(unittest.TestCase):
def test_square(self):
for square in chess.SQUARES:
file_index = chess.square_file(square)
rank_index = chess.square_rank(square)
self.assertEqual(chess.square(file_index, rank_index), square, chess.square_name(square))
def test_shifts(self):
shifts = [
chess.shift_down,
chess.shift_2_down,
chess.shift_up,
chess.shift_2_up,
chess.shift_right,
chess.shift_2_right,
chess.shift_left,
chess.shift_2_left,
chess.shift_up_left,
chess.shift_up_right,
chess.shift_down_left,
chess.shift_down_right,
]
for shift in shifts:
for bb_square in chess.BB_SQUARES:
shifted = shift(bb_square)
c = chess.popcount(shifted)
self.assertLessEqual(c, 1)
self.assertEqual(c, chess.popcount(shifted & chess.BB_ALL))
def test_parse_square(self):
self.assertEqual(chess.parse_square("a1"), 0)
with self.assertRaises(ValueError):
self.assertEqual(chess.parse_square("A1"))
with self.assertRaises(ValueError):
self.assertEqual(chess.parse_square("a0"))
class MoveTestCase(unittest.TestCase):
def test_equality(self):
a = chess.Move(chess.A1, chess.A2)
b = chess.Move(chess.A1, chess.A2)
c = chess.Move(chess.H7, chess.H8, chess.BISHOP)
d1 = chess.Move(chess.H7, chess.H8)
d2 = chess.Move(chess.H7, chess.H8)
self.assertEqual(a, b)
self.assertEqual(b, a)
self.assertEqual(d1, d2)
self.assertNotEqual(a, c)
self.assertNotEqual(c, d1)
self.assertNotEqual(b, d1)
self.assertFalse(d1 != d2)
def test_uci_parsing(self):
self.assertEqual(chess.Move.from_uci("b5c7").uci(), "b5c7")
self.assertEqual(chess.Move.from_uci("e7e8q").uci(), "e7e8q")
self.assertEqual(chess.Move.from_uci("P@e4").uci(), "P@e4")
self.assertEqual(chess.Move.from_uci("B@f4").uci(), "B@f4")
self.assertEqual(chess.Move.from_uci("0000").uci(), "0000")
def test_invalid_uci(self):
with self.assertRaises(ValueError):
chess.Move.from_uci("")
with self.assertRaises(ValueError):
chess.Move.from_uci("N")
with self.assertRaises(ValueError):
chess.Move.from_uci("z1g3")
with self.assertRaises(ValueError):
chess.Move.from_uci("Q@g9")
def test_xboard_move(self):
self.assertEqual(chess.Move.from_uci("b5c7").xboard(), "b5c7")
self.assertEqual(chess.Move.from_uci("e7e8q").xboard(), "e7e8q")
self.assertEqual(chess.Move.from_uci("P@e4").xboard(), "P@e4")
self.assertEqual(chess.Move.from_uci("B@f4").xboard(), "B@f4")
self.assertEqual(chess.Move.from_uci("0000").xboard(), "@@@@")
def test_copy(self):
a = chess.Move.from_uci("N@f3")
b = chess.Move.from_uci("a1h8")
c = chess.Move.from_uci("g7g8r")
self.assertEqual(copy.copy(a), a)
self.assertEqual(copy.copy(b), b)
self.assertEqual(copy.copy(c), c)
class PieceTestCase(unittest.TestCase):
def test_equality(self):
a = chess.Piece(chess.BISHOP, chess.WHITE)
b = chess.Piece(chess.KING, chess.BLACK)
c = chess.Piece(chess.KING, chess.WHITE)
d1 = chess.Piece(chess.BISHOP, chess.WHITE)
d2 = chess.Piece(chess.BISHOP, chess.WHITE)
self.assertEqual(len(set([a, b, c, d1, d2])), 3)
self.assertEqual(a, d1)
self.assertEqual(d1, a)
self.assertEqual(d1, d2)
self.assertEqual(repr(a), repr(d1))
self.assertNotEqual(a, b)
self.assertNotEqual(b, c)
self.assertNotEqual(b, d1)
self.assertNotEqual(a, c)
self.assertFalse(d1 != d2)
self.assertNotEqual(repr(a), repr(b))
self.assertNotEqual(repr(b), repr(c))
self.assertNotEqual(repr(b), repr(d1))
self.assertNotEqual(repr(a), repr(c))
def test_from_symbol(self):
white_knight = chess.Piece.from_symbol("N")
self.assertEqual(white_knight.color, chess.WHITE)
self.assertEqual(white_knight.piece_type, chess.KNIGHT)
self.assertEqual(white_knight.symbol(), "N")
self.assertEqual(str(white_knight), "N")
black_queen = chess.Piece.from_symbol("q")
self.assertEqual(black_queen.color, chess.BLACK)
self.assertEqual(black_queen.piece_type, chess.QUEEN)
self.assertEqual(black_queen.symbol(), "q")
self.assertEqual(str(black_queen), "q")
def test_hash(self):
pieces = {chess.Piece.from_symbol(symbol) for symbol in "pnbrqkPNBRQK"}
self.assertEqual(len(pieces), 12)
hashes = {hash(piece) for piece in pieces}
self.assertEqual(hashes, set(range(12)))
class BoardTestCase(unittest.TestCase):
def test_default_position(self):
board = chess.Board()
self.assertEqual(board.piece_at(chess.B1), chess.Piece.from_symbol("N"))
self.assertEqual(board.fen(), chess.STARTING_FEN)
self.assertEqual(board.turn, chess.WHITE)
def test_empty(self):
board = chess.Board.empty()
self.assertEqual(board.fen(), "8/8/8/8/8/8/8/8 w - - 0 1")
self.assertEqual(board, chess.Board(None))
def test_ply(self):
board = chess.Board()
self.assertEqual(board.ply(), 0)
board.push_san("d4")
self.assertEqual(board.ply(), 1)
board.push_san("d5")
self.assertEqual(board.ply(), 2)
board.clear_stack()
self.assertEqual(board.ply(), 2)
board.push_san("Nf3")
self.assertEqual(board.ply(), 3)
def test_from_epd(self):
base_epd = "rnbqkb1r/ppp1pppp/5n2/3P4/8/8/PPPP1PPP/RNBQKBNR w KQkq -"
board, ops = chess.Board.from_epd(base_epd + " ce 55;")
self.assertEqual(ops["ce"], 55)
self.assertEqual(board.fen(), base_epd + " 0 1")
def test_move_making(self):
board = chess.Board()
move = chess.Move(chess.E2, chess.E4)
board.push(move)
self.assertEqual(board.peek(), move)
def test_fen(self):
board = chess.Board()
self.assertEqual(board.fen(), chess.STARTING_FEN)
fen = "6k1/pb3pp1/1p2p2p/1Bn1P3/8/5N2/PP1q1PPP/6K1 w - - 0 24"
board.set_fen(fen)
self.assertEqual(board.fen(), fen)
board.push(chess.Move.from_uci("f3d2"))
self.assertEqual(board.fen(), "6k1/pb3pp1/1p2p2p/1Bn1P3/8/8/PP1N1PPP/6K1 b - - 0 24")
def test_xfen(self):
# https://de.wikipedia.org/wiki/Forsyth-Edwards-Notation#Beispiel
xfen = "rn2k1r1/ppp1pp1p/3p2p1/5bn1/P7/2N2B2/1PPPPP2/2BNK1RR w Gkq - 4 11"
board = chess.Board(xfen, chess960=True)
self.assertEqual(board.castling_rights, chess.BB_G1 | chess.BB_A8 | chess.BB_G8)
self.assertEqual(board.clean_castling_rights(), chess.BB_G1 | chess.BB_A8 | chess.BB_G8)
self.assertEqual(board.shredder_fen(), "rn2k1r1/ppp1pp1p/3p2p1/5bn1/P7/2N2B2/1PPPPP2/2BNK1RR w Gga - 4 11")
self.assertEqual(board.fen(), xfen)
self.assertTrue(board.has_castling_rights(chess.WHITE))
self.assertTrue(board.has_castling_rights(chess.BLACK))
self.assertTrue(board.has_kingside_castling_rights(chess.BLACK))
self.assertTrue(board.has_kingside_castling_rights(chess.WHITE))
self.assertTrue(board.has_queenside_castling_rights(chess.BLACK))
self.assertFalse(board.has_queenside_castling_rights(chess.WHITE))
# Chess960 position #284.
board = chess.Board("rkbqrbnn/pppppppp/8/8/8/8/PPPPPPPP/RKBQRBNN w - - 0 1", chess960=True)
board.castling_rights = board.rooks
self.assertTrue(board.clean_castling_rights() & chess.BB_A1)
self.assertEqual(board.fen(), "rkbqrbnn/pppppppp/8/8/8/8/PPPPPPPP/RKBQRBNN w KQkq - 0 1")
self.assertEqual(board.shredder_fen(), "rkbqrbnn/pppppppp/8/8/8/8/PPPPPPPP/RKBQRBNN w EAea - 0 1")
# Valid en passant square on illegal board.
fen = "8/8/8/pP6/8/8/8/8 w - a6 0 1"
board = chess.Board(fen)
self.assertEqual(board.fen(), fen)
# Illegal en passant square on illegal board.
fen = "1r6/8/8/pP6/8/8/8/1K6 w - a6 0 1"
board = chess.Board(fen)
self.assertEqual(board.fen(), "1r6/8/8/pP6/8/8/8/1K6 w - - 0 1")
def test_fen_en_passant(self):
board = chess.Board()
board.push_san("e4")
self.assertEqual(board.fen(en_passant="fen"), "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1")
self.assertEqual(board.fen(en_passant="xfen"), "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1")
def test_get_set(self):
board = chess.Board()
self.assertEqual(board.piece_at(chess.B1), chess.Piece.from_symbol("N"))
board.remove_piece_at(chess.E2)
self.assertEqual(board.piece_at(chess.E2), None)
board.set_piece_at(chess.E4, chess.Piece.from_symbol("r"))
self.assertEqual(board.piece_type_at(chess.E4), chess.ROOK)
board.set_piece_at(chess.F1, None)
self.assertEqual(board.piece_at(chess.F1), None)
board.set_piece_at(chess.H7, chess.Piece.from_symbol("Q"), promoted=True)
self.assertEqual(board.promoted, chess.BB_H7)
board.set_piece_at(chess.H7, None)
self.assertEqual(board.promoted, chess.BB_EMPTY)
self.assertEqual(board.piece_at(chess.H7), None)
def test_color_at(self):
board = chess.Board()
self.assertEqual(board.color_at(chess.A1), chess.WHITE)
self.assertEqual(board.color_at(chess.G7), chess.BLACK)
self.assertEqual(board.color_at(chess.E4), None)
def test_pawn_captures(self):
board = chess.Board()
# King's Gambit.
board.push(chess.Move.from_uci("e2e4"))
board.push(chess.Move.from_uci("e7e5"))
board.push(chess.Move.from_uci("f2f4"))
# Accepted.
exf4 = chess.Move.from_uci("e5f4")
self.assertIn(exf4, board.pseudo_legal_moves)
self.assertIn(exf4, board.legal_moves)
board.push(exf4)
board.pop()
def test_pawn_move_generation(self):
board = chess.Board("8/2R1P3/8/2pp4/2k1r3/P7/8/1K6 w - - 1 55")
self.assertEqual(len(list(board.generate_pseudo_legal_moves())), 16)
def test_single_step_pawn_move(self):
board = chess.Board()
a3 = chess.Move.from_uci("a2a3")
self.assertIn(a3, board.pseudo_legal_moves)
self.assertIn(a3, board.legal_moves)
board.push(a3)
board.pop()
self.assertEqual(board.fen(), chess.STARTING_FEN)
def test_castling(self):
board = chess.Board("r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 1 1")
# Let white castle short.
move = board.parse_xboard("O-O")
self.assertEqual(move, chess.Move.from_uci("e1g1"))
self.assertEqual(board.san(move), "O-O")
self.assertEqual(board.xboard(move), "e1g1")
self.assertIn(move, board.legal_moves)
board.push(move)
# Let black castle long.
move = board.parse_xboard("O-O-O")
self.assertEqual(board.san(move), "O-O-O")
self.assertEqual(board.xboard(move), "e8c8")
self.assertIn(move, board.legal_moves)
board.push(move)
self.assertEqual(board.fen(), "2kr3r/8/8/8/8/8/8/R4RK1 w - - 3 2")
# Undo both castling moves.
board.pop()
board.pop()
self.assertEqual(board.fen(), "r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 1 1")
# Let white castle long.
move = board.parse_san("O-O-O")
self.assertEqual(board.san(move), "O-O-O")
self.assertIn(move, board.legal_moves)
board.push(move)
# Let black castle short.
move = board.parse_san("O-O")
self.assertEqual(board.san(move), "O-O")
self.assertIn(move, board.legal_moves)
board.push(move)
self.assertEqual(board.fen(), "r4rk1/8/8/8/8/8/8/2KR3R w - - 3 2")
# Undo both castling moves.
board.pop()
board.pop()
self.assertEqual(board.fen(), "r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 1 1")
def test_castling_san(self):
board = chess.Board("4k3/8/8/8/8/8/8/4K2R w K - 0 1")
self.assertEqual(board.parse_san("O-O"), chess.Move.from_uci("e1g1"))
with self.assertRaises(ValueError):
board.parse_san("Kg1")
with self.assertRaises(ValueError):
board.parse_san("Kh1")
def test_ninesixty_castling(self):
fen = "3r1k1r/4pp2/8/8/8/8/8/4RKR1 w Gd - 1 1"
board = chess.Board(fen, chess960=True)
# Let white do the kingside swap.
move = board.parse_san("O-O")
self.assertEqual(board.san(move), "O-O")
self.assertEqual(board.xboard(move), "O-O")
self.assertEqual(move.from_square, chess.F1)
self.assertEqual(move.to_square, chess.G1)
self.assertIn(move, board.legal_moves)
board.push(move)
self.assertEqual(board.shredder_fen(), "3r1k1r/4pp2/8/8/8/8/8/4RRK1 b d - 2 1")
# Black can not castle kingside.
self.assertNotIn(chess.Move.from_uci("e8h8"), board.legal_moves)
# Let black castle queenside.
move = board.parse_san("O-O-O")
self.assertEqual(board.san(move), "O-O-O")
self.assertEqual(board.xboard(move), "O-O-O")
self.assertEqual(move.from_square, chess.F8)
self.assertEqual(move.to_square, chess.D8)
self.assertIn(move, board.legal_moves)
board.push(move)
self.assertEqual(board.shredder_fen(), "2kr3r/4pp2/8/8/8/8/8/4RRK1 w - - 3 2")
# Restore initial position.
board.pop()
board.pop()
self.assertEqual(board.shredder_fen(), fen)
fen = "Qr4k1/4pppp/8/8/8/8/8/R5KR w Hb - 0 1"
board = chess.Board(fen, chess960=True)
# White can just hop the rook over.
move = board.parse_san("O-O")
self.assertEqual(board.san(move), "O-O")
self.assertEqual(move.from_square, chess.G1)
self.assertEqual(move.to_square, chess.H1)
self.assertIn(move, board.legal_moves)
board.push(move)
self.assertEqual(board.shredder_fen(), "Qr4k1/4pppp/8/8/8/8/8/R4RK1 b b - 1 1")
# Black can not castle queenside nor kingside.
self.assertFalse(any(board.generate_castling_moves()))
# Restore initial position.
board.pop()
self.assertEqual(board.shredder_fen(), fen)
def test_hside_rook_blocks_aside_castling(self):
board = chess.Board("4rrk1/pbbp2p1/1ppnp3/3n1pqp/3N1PQP/1PPNP3/PBBP2P1/4RRK1 w Ff - 10 18", chess960=True)
self.assertNotIn(chess.Move.from_uci("g1f1"), board.legal_moves)
self.assertNotIn(chess.Move.from_uci("g1e1"), board.legal_moves)
self.assertNotIn(chess.Move.from_uci("g1c1"), board.legal_moves)
self.assertNotIn(chess.Move.from_uci("g1a1"), board.legal_moves)
self.assertIn(chess.Move.from_uci("g1h1"), board.legal_moves) # Kh1
def test_selective_castling(self):
board = chess.Board("r3k2r/pppppppp/8/8/8/8/PPPPPPPP/R3K2R w KQkq - 0 1")
# King not selected.
self.assertFalse(any(board.generate_castling_moves(chess.BB_ALL & ~board.kings)))
# Rook on h1 not selected.
moves = board.generate_castling_moves(chess.BB_ALL, chess.BB_ALL & ~chess.BB_H1)
self.assertEqual(len(list(moves)), 1)
def test_castling_right_not_destroyed_bug(self):
# A rook move from h8 to h1 was only taking white's possible castling
# rights away.
board = chess.Board("2r1k2r/2qbbpp1/p2pp3/1p3PP1/Pn2P3/1PN1B3/1P3QB1/1K1R3R b k - 0 22")
board.push_san("Rxh1")
self.assertEqual(board.epd(), "2r1k3/2qbbpp1/p2pp3/1p3PP1/Pn2P3/1PN1B3/1P3QB1/1K1R3r w - -")
def test_invalid_castling_rights(self):
# KQkq is not valid in this standard chess position.
board = chess.Board("1r2k3/8/8/8/8/8/8/R3KR2 w KQkq - 0 1")
self.assertEqual(board.status(), chess.STATUS_BAD_CASTLING_RIGHTS)
self.assertEqual(board.fen(), "1r2k3/8/8/8/8/8/8/R3KR2 w Q - 0 1")
self.assertTrue(board.has_queenside_castling_rights(chess.WHITE))
self.assertFalse(board.has_kingside_castling_rights(chess.WHITE))
self.assertFalse(board.has_queenside_castling_rights(chess.BLACK))
self.assertFalse(board.has_kingside_castling_rights(chess.BLACK))
board = chess.Board("4k2r/8/8/8/8/8/8/R1K5 w KQkq - 0 1", chess960=True)
self.assertEqual(board.status(), chess.STATUS_BAD_CASTLING_RIGHTS)
self.assertEqual(board.fen(), "4k2r/8/8/8/8/8/8/R1K5 w Qk - 0 1")
board = chess.Board("1r2k3/8/1p6/8/8/5P2/8/1R2KR2 w KQkq - 0 1", chess960=True)
self.assertEqual(board.status(), chess.STATUS_BAD_CASTLING_RIGHTS)
self.assertEqual(board.fen(), "1r2k3/8/1p6/8/8/5P2/8/1R2KR2 w KQq - 0 1")
def test_ninesixty_different_king_and_rook_file(self):
# Theoretically, this position (with castling rights) can not be reached
# with a series of legal moves from one of the 960 starting positions.
# Decision: We don't care, neither do Stockfish or lichess.org.
fen = "1r1k1r2/5p2/8/8/8/8/3N4/R5KR b KQkq - 0 1"
board = chess.Board(fen, chess960=True)
self.assertEqual(board.fen(), fen)
def test_ninesixty_prevented_castle(self):
board = chess.Board("4k3/8/8/1b6/8/8/8/5RKR w KQ - 0 1", chess960=True)
self.assertFalse(board.is_legal(chess.Move.from_uci("g1f1")))
def test_find_move(self):
board = chess.Board("4k3/1P6/8/8/8/8/3P4/4K2R w K - 0 1")
# Pawn moves.
self.assertEqual(board.find_move(chess.D2, chess.D4), chess.Move.from_uci("d2d4"))
self.assertEqual(board.find_move(chess.B7, chess.B8), chess.Move.from_uci("b7b8q"))
self.assertEqual(board.find_move(chess.B7, chess.B8, chess.KNIGHT), chess.Move.from_uci("b7b8n"))
# Illegal moves.
with self.assertRaises(ValueError):
board.find_move(chess.D2, chess.D8)
with self.assertRaises(ValueError):
board.find_move(chess.E1, chess.A1)
# Castling.
self.assertEqual(board.find_move(chess.E1, chess.G1), chess.Move.from_uci("e1g1"))
self.assertEqual(board.find_move(chess.E1, chess.H1), chess.Move.from_uci("e1g1"))
board.chess960 = True
self.assertEqual(board.find_move(chess.E1, chess.H1), chess.Move.from_uci("e1h1"))
def test_clean_castling_rights(self):
board = chess.Board()
board.set_board_fen("k6K/8/8/pppppppp/8/8/8/QqQq4")
self.assertEqual(board.clean_castling_rights(), chess.BB_EMPTY)
self.assertEqual(board.fen(), "k6K/8/8/pppppppp/8/8/8/QqQq4 w - - 0 1")
board.push_san("Qxc5")
self.assertEqual(board.clean_castling_rights(), chess.BB_EMPTY)
self.assertEqual(board.fen(), "k6K/8/8/ppQppppp/8/8/8/Qq1q4 b - - 0 1")
def test_insufficient_material(self):
def _check(board, white, black):
self.assertEqual(board.has_insufficient_material(chess.WHITE), white)
self.assertEqual(board.has_insufficient_material(chess.BLACK), black)
self.assertEqual(board.is_insufficient_material(), white and black)
# Imperfect implementation.
false_negative = False
_check(chess.Board(), False, False)
_check(chess.Board("k1K1B1B1/8/8/8/8/8/8/8 w - - 7 32"), True, True)
_check(chess.Board("kbK1B1B1/8/8/8/8/8/8/8 w - - 7 32"), False, False)
_check(chess.Board("8/5k2/8/8/8/8/3K4/8 w - - 0 1"), True, True)
_check(chess.Board("8/3k4/8/8/2N5/8/3K4/8 b - - 0 1"), True, True)
_check(chess.Board("8/4rk2/8/8/8/8/3K4/8 w - - 0 1"), True, False)
_check(chess.Board("8/4qk2/8/8/8/8/3K4/8 w - - 0 1"), True, False)
_check(chess.Board("8/4bk2/8/8/8/8/3KB3/8 w - - 0 1"), False, False)
_check(chess.Board("8/8/3Q4/2bK4/B7/8/1k6/8 w - - 1 68"), False, False)
_check(chess.Board("8/5k2/8/8/8/4B3/3K1B2/8 w - - 0 1"), True, True)
_check(chess.Board("5K2/8/8/1B6/8/k7/6b1/8 w - - 0 39"), True, True)
_check(chess.Board("8/8/8/4k3/5b2/3K4/8/2B5 w - - 0 33"), True, True)
_check(chess.Board("3b4/8/8/6b1/8/8/R7/K1k5 w - - 0 1"), False, True)
_check(chess.variant.AtomicBoard("8/3k4/8/8/2N5/8/3K4/8 b - - 0 1"), True, True)
_check(chess.variant.AtomicBoard("8/4rk2/8/8/8/8/3K4/8 w - - 0 1"), True, True)
_check(chess.variant.AtomicBoard("8/4qk2/8/8/8/8/3K4/8 w - - 0 1"), True, False)
_check(chess.variant.AtomicBoard("8/1k6/8/2n5/8/3NK3/8/8 b - - 0 1"), False, False)
_check(chess.variant.AtomicBoard("8/4bk2/8/8/8/8/3KB3/8 w - - 0 1"), True, True)
_check(chess.variant.AtomicBoard("4b3/5k2/8/8/8/8/3KB3/8 w - - 0 1"), False, False)
_check(chess.variant.AtomicBoard("3Q4/5kKB/8/8/8/8/8/8 b - - 0 1"), False, True)
_check(chess.variant.AtomicBoard("8/5k2/8/8/8/8/5K2/4bb2 w - - 0 1"), True, False)
_check(chess.variant.AtomicBoard("8/5k2/8/8/8/8/5K2/4nb2 w - - 0 1"), True, False)
_check(chess.variant.GiveawayBoard("8/4bk2/8/8/8/8/3KB3/8 w - - 0 1"), False, False)
_check(chess.variant.GiveawayBoard("4b3/5k2/8/8/8/8/3KB3/8 w - - 0 1"), False, False)
_check(chess.variant.GiveawayBoard("8/8/8/6b1/8/3B4/4B3/5B2 w - - 0 1"), True, True)
_check(chess.variant.GiveawayBoard("8/8/5b2/8/8/3B4/3B4/8 w - - 0 1"), True, False)
_check(chess.variant.SuicideBoard("8/5p2/5P2/8/3B4/1bB5/8/8 b - - 0 1"), false_negative, false_negative)
_check(chess.variant.KingOfTheHillBoard("8/5k2/8/8/8/8/3K4/8 w - - 0 1"), False, False)
_check(chess.variant.RacingKingsBoard("8/5k2/8/8/8/8/3K4/8 w - - 0 1"), False, False)
_check(chess.variant.ThreeCheckBoard("8/5k2/8/8/8/8/3K4/8 w - - 3+3 0 1"), True, True)
_check(chess.variant.ThreeCheckBoard("8/5k2/8/8/8/8/3K2N1/8 w - - 3+3 0 1"), False, True)
_check(chess.variant.CrazyhouseBoard("8/5k2/8/8/8/8/3K2N1/8[] w - - 0 1"), True, True)
_check(chess.variant.CrazyhouseBoard("8/5k2/8/8/8/5B2/3KB3/8[] w - - 0 1"), False, False)
_check(chess.variant.CrazyhouseBoard("8/8/8/8/3k4/3N~4/3K4/8 w - - 0 1"), False, False)
_check(chess.variant.HordeBoard("8/5k2/8/8/8/4NN2/8/8 w - - 0 1"), True, False)
def test_promotion_with_check(self):
board = chess.Board("8/6P1/2p5/1Pqk4/6P1/2P1RKP1/4P1P1/8 w - - 0 1")
board.push(chess.Move.from_uci("g7g8q"))
self.assertTrue(board.is_check())
self.assertEqual(board.fen(), "6Q1/8/2p5/1Pqk4/6P1/2P1RKP1/4P1P1/8 b - - 0 1")
board = chess.Board("8/8/8/3R1P2/8/2k2K2/3p4/r7 b - - 0 82")
board.push_san("d1=Q+")
self.assertEqual(board.fen(), "8/8/8/3R1P2/8/2k2K2/8/r2q4 w - - 0 83")
def test_scholars_mate(self):
board = chess.Board()
e4 = chess.Move.from_uci("e2e4")
self.assertIn(e4, board.legal_moves)
board.push(e4)
e5 = chess.Move.from_uci("e7e5")
self.assertIn(e5, board.legal_moves)
board.push(e5)
Qf3 = chess.Move.from_uci("d1f3")
self.assertIn(Qf3, board.legal_moves)
board.push(Qf3)
Nc6 = chess.Move.from_uci("b8c6")
self.assertIn(Nc6, board.legal_moves)
board.push(Nc6)
Bc4 = chess.Move.from_uci("f1c4")
self.assertIn(Bc4, board.legal_moves)
board.push(Bc4)
Rb8 = chess.Move.from_uci("a8b8")
self.assertIn(Rb8, board.legal_moves)
board.push(Rb8)
self.assertFalse(board.is_check())
self.assertFalse(board.is_checkmate())
self.assertFalse(board.is_game_over())
self.assertFalse(board.is_stalemate())
Qf7_mate = chess.Move.from_uci("f3f7")
self.assertIn(Qf7_mate, board.legal_moves)
board.push(Qf7_mate)
self.assertTrue(board.is_check())
self.assertTrue(board.is_checkmate())
self.assertTrue(board.is_game_over())
self.assertTrue(board.is_game_over(claim_draw=True))
self.assertFalse(board.is_stalemate())
self.assertEqual(board.fen(), "1rbqkbnr/pppp1Qpp/2n5/4p3/2B1P3/8/PPPP1PPP/RNB1K1NR b KQk - 0 4")
def test_result(self):
# Undetermined.
board = chess.Board()
self.assertEqual(board.result(claim_draw=True), "*")
# White checkmated.
board = chess.Board("rnb1kbnr/pppp1ppp/8/4p3/6Pq/5P2/PPPPP2P/RNBQKBNR w KQkq - 1 3")
self.assertEqual(board.result(claim_draw=True), "0-1")
# Stalemate.
board = chess.Board("7K/7P/7k/8/6q1/8/8/8 w - - 0 1")
self.assertEqual(board.result(), "1/2-1/2")
# Insufficient material.
board = chess.Board("4k3/8/8/8/8/5B2/8/4K3 w - - 0 1")
self.assertEqual(board.result(), "1/2-1/2")
# Fiftyseven-move rule.
board = chess.Board("4k3/8/6r1/8/8/8/2R5/4K3 w - - 369 1")
self.assertEqual(board.result(), "1/2-1/2")
# Fifty-move rule.
board = chess.Board("4k3/8/6r1/8/8/8/2R5/4K3 w - - 120 1")
self.assertEqual(board.result(), "*")
self.assertEqual(board.result(claim_draw=True), "1/2-1/2")
def test_san(self):
# Castling with check.
fen = "rnbk1b1r/ppp2pp1/5n1p/4p1B1/2P5/2N5/PP2PPPP/R3KBNR w KQ - 0 7"
board = chess.Board(fen)
long_castle_check = chess.Move.from_uci("e1a1")
self.assertEqual(board.san(long_castle_check), "O-O-O+")
self.assertEqual(board.fen(), fen)
# En passant mate.
fen = "6bk/7b/8/3pP3/8/8/8/Q3K3 w - d6 0 2"
board = chess.Board(fen)
fxe6_mate_ep = chess.Move.from_uci("e5d6")
self.assertEqual(board.san(fxe6_mate_ep), "exd6#")
self.assertEqual(board.fen(), fen)
# Test disambiguation.
fen = "N3k2N/8/8/3N4/N4N1N/2R5/1R6/4K3 w - - 0 1"
board = chess.Board(fen)
self.assertEqual(board.san(chess.Move.from_uci("e1f1")), "Kf1")
self.assertEqual(board.san(chess.Move.from_uci("c3c2")), "Rcc2")
self.assertEqual(board.san(chess.Move.from_uci("b2c2")), "Rbc2")
self.assertEqual(board.san(chess.Move.from_uci("a4b6")), "N4b6")
self.assertEqual(board.san(chess.Move.from_uci("h8g6")), "N8g6")
self.assertEqual(board.san(chess.Move.from_uci("h4g6")), "Nh4g6")
self.assertEqual(board.fen(), fen)
# Do not disambiguate illegal alternatives.
fen = "8/8/8/R2nkn2/8/8/2K5/8 b - - 0 1"
board = chess.Board(fen)
self.assertEqual(board.san(chess.Move.from_uci("f5e3")), "Ne3+")
self.assertEqual(board.fen(), fen)
# Promotion.
fen = "7k/1p2Npbp/8/2P5/1P1r4/3b2QP/3q1pPK/2RB4 b - - 1 29"
board = chess.Board(fen)
self.assertEqual(board.san(chess.Move.from_uci("f2f1q")), "f1=Q")
self.assertEqual(board.san(chess.Move.from_uci("f2f1n")), "f1=N+")
self.assertEqual(board.fen(), fen)
def test_lan(self):
# Normal moves always with origin square.
fen = "N3k2N/8/8/3N4/N4N1N/2R5/1R6/4K3 w - - 0 1"
board = chess.Board(fen)
self.assertEqual(board.lan(chess.Move.from_uci("e1f1")), "Ke1-f1")
self.assertEqual(board.lan(chess.Move.from_uci("c3c2")), "Rc3-c2")
self.assertEqual(board.lan(chess.Move.from_uci("a4c5")), "Na4-c5")
self.assertEqual(board.fen(), fen)
# Normal capture.
fen = "rnbq1rk1/ppp1bpp1/4pn1p/3p2B1/2PP4/2N1PN2/PP3PPP/R2QKB1R w KQ - 0 7"
board = chess.Board(fen)
self.assertEqual(board.lan(chess.Move.from_uci("g5f6")), "Bg5xf6")
self.assertEqual(board.fen(), fen)
# Pawn captures and moves.
fen = "6bk/7b/8/3pP3/8/8/8/Q3K3 w - d6 0 2"
board = chess.Board(fen)
self.assertEqual(board.lan(chess.Move.from_uci("e5d6")), "e5xd6#")
self.assertEqual(board.lan(chess.Move.from_uci("e5e6")), "e5-e6+")
self.assertEqual(board.fen(), fen)
def test_san_newline(self):
board = chess.Board("rnbqk2r/ppppppbp/5np1/8/8/5NP1/PPPPPPBP/RNBQK2R w KQkq - 2 4")
with self.assertRaises(ValueError):
board.parse_san("O-O\n")
with self.assertRaises(ValueError):
board.parse_san("Nc3\n")
def test_pawn_capture_san_without_file(self):
board = chess.Board("2rq1rk1/pb2bppp/1p2p3/n1ppPn2/2PP4/PP3N2/1B1NQPPP/RB3RK1 b - - 4 13")
with self.assertRaises(ValueError):
board.parse_san("c4")
board = chess.Board("4k3/8/8/4Pp2/8/8/8/4K3 w - f6 0 2")
with self.assertRaises(ValueError):
board.parse_san("f6")
def test_variation_san(self):
board = chess.Board()
self.assertEqual('1. e4 e5 2. Nf3',
board.variation_san([chess.Move.from_uci(m) for m in
['e2e4', 'e7e5', 'g1f3']]))
self.assertEqual('1. e4 e5 2. Nf3 Nc6 3. Bb5 a6',
board.variation_san([chess.Move.from_uci(m) for m in
['e2e4', 'e7e5', 'g1f3', 'b8c6', 'f1b5', 'a7a6']]))
fen = "rn1qr1k1/1p2bppp/p3p3/3pP3/P2P1B2/2RB1Q1P/1P3PP1/R5K1 w - - 0 19"
board = chess.Board(fen)
variation = ['d3h7', 'g8h7', 'f3h5', 'h7g8', 'c3g3', 'e7f8', 'f4g5',
'e8e7', 'g5f6', 'b8d7', 'h5h6', 'd7f6', 'e5f6', 'g7g6',
'f6e7', 'f8e7']
var_w = board.variation_san([chess.Move.from_uci(m) for m in variation])
self.assertEqual(("19. Bxh7+ Kxh7 20. Qh5+ Kg8 21. Rg3 Bf8 22. Bg5 Re7 "
"23. Bf6 Nd7 24. Qh6 Nxf6 25. exf6 g6 26. fxe7 Bxe7"),
var_w)
self.assertEqual(fen, board.fen(), msg="Board unchanged by variation_san")
board.push(chess.Move.from_uci(variation.pop(0)))
var_b = board.variation_san([chess.Move.from_uci(m) for m in variation])
self.assertEqual(("19...Kxh7 20. Qh5+ Kg8 21. Rg3 Bf8 22. Bg5 Re7 "
"23. Bf6 Nd7 24. Qh6 Nxf6 25. exf6 g6 26. fxe7 Bxe7"),
var_b)
illegal_variation = ['d3h7', 'g8h7', 'f3h6', 'h7g8']
board = chess.Board(fen)
with self.assertRaises(ValueError) as err:
board.variation_san([chess.Move.from_uci(m) for m in illegal_variation])
message = str(err.exception)
self.assertIn('illegal move', message.lower(),
msg=f"Error [{message}] mentions illegal move")
self.assertIn('f3h6', message,
msg=f"Illegal move f3h6 appears in message [{message}]")
def test_move_stack_usage(self):
board = chess.Board()
board.push_uci("d2d4")
board.push_uci("d7d5")
board.push_uci("g1f3")
board.push_uci("c8f5")
board.push_uci("e2e3")
board.push_uci("e7e6")
board.push_uci("f1d3")
board.push_uci("f8d6")
board.push_uci("e1h1")
san = chess.Board().variation_san(board.move_stack)
self.assertEqual(san, "1. d4 d5 2. Nf3 Bf5 3. e3 e6 4. Bd3 Bd6 5. O-O")
def test_is_legal_move(self):
fen = "3k4/6P1/7P/8/K7/8/8/4R3 w - - 0 1"
board = chess.Board(fen)
# Legal moves: Rg1, g8=R+.
self.assertIn(chess.Move.from_uci("e1g1"), board.legal_moves)
self.assertIn(chess.Move.from_uci("g7g8r"), board.legal_moves)
# Impossible promotion: Kb5, h7.
self.assertNotIn(chess.Move.from_uci("a5b5q"), board.legal_moves)
self.assertNotIn(chess.Move.from_uci("h6h7n"), board.legal_moves)
# Missing promotion.
self.assertNotIn(chess.Move.from_uci("g7g8"), board.legal_moves)
# Promote to pawn or king.
self.assertFalse(board.is_legal(chess.Move.from_uci("g7g8p")))
self.assertFalse(board.is_pseudo_legal(chess.Move.from_uci("g7g8p")))
self.assertFalse(board.is_legal(chess.Move.from_uci("g7g8k")))
self.assertFalse(board.is_pseudo_legal(chess.Move.from_uci("g7g8k")))
self.assertEqual(board.fen(), fen)
def test_move_count(self):
board = chess.Board("1N2k3/P7/8/8/3n4/8/2PP4/R3K2R w KQ - 0 1")
self.assertEqual(board.pseudo_legal_moves.count(), 8 + 4 + 3 + 2 + 1 + 6 + 9)
def test_polyglot(self):
# Test Polyglot compatibility using test data from
# http://hardy.uhasselt.be/Toga/book_format.html. Forfeiting castling
# rights should not reset the half-move counter, though.
board = chess.Board()
self.assertEqual(board.fen(), "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")
self.assertEqual(chess.polyglot.zobrist_hash(board), 0x463b96181691fc9c)
board.push_san("e4")
self.assertEqual(board.fen(), "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1")
self.assertEqual(chess.polyglot.zobrist_hash(board), 0x823c9b50fd114196)
board.push_san("d5")
self.assertEqual(board.fen(), "rnbqkbnr/ppp1pppp/8/3p4/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2")
self.assertEqual(chess.polyglot.zobrist_hash(board), 0x0756b94461c50fb0)
board.push_san("e5")
self.assertEqual(board.fen(), "rnbqkbnr/ppp1pppp/8/3pP3/8/8/PPPP1PPP/RNBQKBNR b KQkq - 0 2")
self.assertEqual(chess.polyglot.zobrist_hash(board), 0x662fafb965db29d4)
board.push_san("f5")
self.assertEqual(board.fen(), "rnbqkbnr/ppp1p1pp/8/3pPp2/8/8/PPPP1PPP/RNBQKBNR w KQkq f6 0 3")
self.assertEqual(chess.polyglot.zobrist_hash(board), 0x22a48b5a8e47ff78)
board.push_san("Ke2")
self.assertEqual(board.fen(), "rnbqkbnr/ppp1p1pp/8/3pPp2/8/8/PPPPKPPP/RNBQ1BNR b kq - 1 3")
self.assertEqual(chess.polyglot.zobrist_hash(board), 0x652a607ca3f242c1)
board.push_san("Kf7")
self.assertEqual(board.fen(), "rnbq1bnr/ppp1pkpp/8/3pPp2/8/8/PPPPKPPP/RNBQ1BNR w - - 2 4")
self.assertEqual(chess.polyglot.zobrist_hash(board), 0x00fdd303c946bdd9)
board = chess.Board()
board.push_san("a4")
board.push_san("b5")
board.push_san("h4")
board.push_san("b4")
board.push_san("c4")
self.assertEqual(board.fen(), "rnbqkbnr/p1pppppp/8/8/PpP4P/8/1P1PPPP1/RNBQKBNR b KQkq c3 0 3")
self.assertEqual(chess.polyglot.zobrist_hash(board), 0x3c8123ea7b067637)
board.push_san("bxc3")
board.push_san("Ra3")
self.assertEqual(board.fen(), "rnbqkbnr/p1pppppp/8/8/P6P/R1p5/1P1PPPP1/1NBQKBNR b Kkq - 1 4")
self.assertEqual(chess.polyglot.zobrist_hash(board), 0x5c3f9b829b279560)
def test_castling_move_generation_bug(self):
# Specific test position right after castling.
fen = "rnbqkbnr/2pp1ppp/8/4p3/2BPP3/P1N2N2/PB3PPP/2RQ1RK1 b kq - 1 10"
board = chess.Board(fen)
illegal_move = chess.Move.from_uci("g1g2")
self.assertNotIn(illegal_move, board.legal_moves)
self.assertNotIn(illegal_move, list(board.legal_moves))
self.assertNotIn(illegal_move, board.pseudo_legal_moves)
self.assertNotIn(illegal_move, list(board.pseudo_legal_moves))
# Make a move.
board.push_san("exd4")
# Already castled short, can not castle long.
illegal_move = chess.Move.from_uci("e1c1")
self.assertNotIn(illegal_move, board.pseudo_legal_moves)
self.assertNotIn(illegal_move, board.generate_pseudo_legal_moves())
self.assertNotIn(illegal_move, board.legal_moves)
self.assertNotIn(illegal_move, list(board.legal_moves))
# Unmake the move.
board.pop()
# Generate all pseudo-legal moves, two moves deep.
for move in board.pseudo_legal_moves:
board.push(move)
for move in board.pseudo_legal_moves:
board.push(move)
board.pop()
board.pop()
# Check that board is still consistent.
self.assertEqual(board.fen(), fen)
self.assertTrue(board.kings & chess.BB_G1)
self.assertTrue(board.occupied & chess.BB_G1)
self.assertTrue(board.occupied_co[chess.WHITE] & chess.BB_G1)
self.assertEqual(board.piece_at(chess.G1), chess.Piece(chess.KING, chess.WHITE))
self.assertEqual(board.piece_at(chess.C1), chess.Piece(chess.ROOK, chess.WHITE))
def test_move_generation_bug(self):
# Specific problematic position.
fen = "4kb1r/3b1ppp/8/1r2pNB1/6P1/pP2QP2/P6P/4R1K1 w k - 0 27"
board = chess.Board(fen)
# Make a move.
board.push_san("Re2")
# Check for the illegal move.
illegal_move = chess.Move.from_uci("e8f8")
self.assertNotIn(illegal_move, board.pseudo_legal_moves)
self.assertNotIn(illegal_move, board.generate_pseudo_legal_moves())
self.assertNotIn(illegal_move, board.legal_moves)
self.assertNotIn(illegal_move, board.generate_legal_moves())
# Generate all pseudo-legal moves.
for a in board.pseudo_legal_moves:
board.push(a)
board.pop()
# Unmake the move.
board.pop()
# Check that board is still consistent.
self.assertEqual(board.fen(), fen)
def test_stateful_move_generation_bug(self):
board = chess.Board("r1b1k3/p2p1Nr1/n2b3p/3pp1pP/2BB1p2/P3P2R/Q1P3P1/R3K1N1 b Qq - 0 1")
count = 0
for move in board.legal_moves:
board.push(move)
list(board.generate_legal_moves())
count += 1
board.pop()
self.assertEqual(count, 26)
def test_ninesixty_castling_bug(self):
board = chess.Board("4r3/3k4/8/8/8/8/q5PP/1R1KR3 w Q - 2 2", chess960=True)
move = chess.Move.from_uci("d1b1")
self.assertTrue(board.is_castling(move))
self.assertIn(move, board.generate_pseudo_legal_moves())
self.assertTrue(board.is_pseudo_legal(move))
self.assertIn(move, board.generate_legal_moves())
self.assertTrue(board.is_legal(move))
self.assertEqual(board.parse_san("O-O-O+"), move)
self.assertEqual(board.san(move), "O-O-O+")
def test_equality(self):
self.assertEqual(chess.Board(), chess.Board())
self.assertFalse(chess.Board() != chess.Board())
a = chess.Board()
a.push_san("d4")
b = chess.Board()
b.push_san("d3")
self.assertNotEqual(a, b)
self.assertFalse(a == b)
def test_status(self):
board = chess.Board()
self.assertEqual(board.status(), chess.STATUS_VALID)
self.assertTrue(board.is_valid())
board.remove_piece_at(chess.H1)
self.assertTrue(board.status() & chess.STATUS_BAD_CASTLING_RIGHTS)
board.remove_piece_at(chess.E8)
self.assertTrue(board.status() & chess.STATUS_NO_BLACK_KING)
# The en passant square should be set even if no capture is actually
# possible.
board = chess.Board()
board.push_san("e4")
self.assertEqual(board.ep_square, chess.E3)
self.assertEqual(board.status(), chess.STATUS_VALID)
# But there must indeed be a pawn there.
board.remove_piece_at(chess.E4)
self.assertEqual(board.status(), chess.STATUS_INVALID_EP_SQUARE)
# King must be between the two rooks.
board = chess.Board("2rrk3/8/8/8/8/8/3PPPPP/2RK4 w cd - 0 1")
self.assertEqual(board.status(), chess.STATUS_BAD_CASTLING_RIGHTS)
# Generally valid position, but not valid standard chess position due
# to non-standard castling rights. Chess960 start position #0.
board = chess.Board("bbqnnrkr/pppppppp/8/8/8/8/PPPPPPPP/BBQNNRKR w KQkq - 0 1", chess960=True)
self.assertEqual(board.status(), chess.STATUS_VALID)
board = chess.Board("bbqnnrkr/pppppppp/8/8/8/8/PPPPPPPP/BBQNNRKR w KQkq - 0 1", chess960=False)
self.assertEqual(board.status(), chess.STATUS_BAD_CASTLING_RIGHTS)
# Opposite check.
board = chess.Board("4k3/8/8/8/8/8/4Q3/4K3 w - - 0 1")
self.assertEqual(board.status(), chess.STATUS_OPPOSITE_CHECK)
# Empty board.
board = chess.Board(None)
self.assertEqual(board.status(), chess.STATUS_EMPTY | chess.STATUS_NO_WHITE_KING | chess.STATUS_NO_BLACK_KING)
# Too many kings.
board = chess.Board("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBKKBNR w KQkq - 0 1")
self.assertEqual(board.status(), chess.STATUS_TOO_MANY_KINGS)
# Triple check.