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test.py
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test.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# This file is part of the python-chess library.
# Copyright (C) 2012-2015 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 chess
import chess.polyglot
import chess.pgn
import chess.uci
import chess.syzygy
import chess.gaviota
import os.path
import textwrap
import sys
import time
import logging
try:
from collections import OrderedDict
except ImportError:
from backport_collections import OrderedDict # Python 2.6
try:
import unittest2 as unittest # Python 2.6
except ImportError:
import unittest
try:
from StringIO import StringIO # Python 2
except ImportError:
from io import StringIO # Python 3
class SquareTestCase(unittest.TestCase):
def test_square(self):
for square in chess.SQUARES:
file_index = chess.file_index(square)
rank_index = chess.rank_index(square)
self.assertEqual(chess.square(file_index, rank_index), square, chess.SQUARE_NAMES[square])
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")
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(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")
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")
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_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 in 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_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)
def test_pawn_captures(self):
board = chess.Board()
# Kings 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.assertTrue(exf4 in board.pseudo_legal_moves)
self.assertTrue(exf4 in 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.assertTrue(a3 in board.pseudo_legal_moves)
self.assertTrue(a3 in 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_san("O-O")
self.assertEqual(move, chess.Move.from_uci("e1g1"))
self.assertEqual(board.san(move), "O-O")
self.assertTrue(move in board.legal_moves)
board.push(move)
# Let black castle long.
move = board.parse_san("O-O-O")
self.assertEqual(board.san(move), "O-O-O")
self.assertTrue(move in 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.assertTrue(move in board.legal_moves)
board.push(move)
# Let black castle short.
move = board.parse_san("O-O")
self.assertEqual(board.san(move), "O-O")
self.assertTrue(move in 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_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 king side swap.
move = board.parse_san("O-O")
self.assertEqual(board.san(move), "O-O")
self.assertEqual(move.from_square, chess.F1)
self.assertEqual(move.to_square, chess.G1)
self.assertTrue(move in 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.assertFalse(chess.Move.from_uci("e8h8") in board.legal_moves)
# Let black castle queenside.
move = board.parse_san("O-O-O")
self.assertEqual(board.san(move), "O-O-O")
self.assertEqual(move.from_square, chess.F8)
self.assertEqual(move.to_square, chess.D8)
self.assertTrue(move in 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, 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.assertTrue(move in 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_castling_right_not_destroyed_bug(self):
# A rook move from H8 to H1 was only taking whites 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 k - 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_insufficient_material(self):
# Starting position.
board = chess.Board()
self.assertFalse(board.is_insufficient_material())
# King vs. King + 2 bishops of the same color.
board = chess.Board("k1K1B1B1/8/8/8/8/8/8/8 w - - 7 32")
self.assertTrue(board.is_insufficient_material())
# Add bishop of opposite color for the weaker side.
board.set_piece_at(chess.B8, chess.Piece.from_symbol("b"))
self.assertFalse(board.is_insufficient_material())
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.assertTrue(e4 in board.legal_moves)
board.push(e4)
e5 = chess.Move.from_uci("e7e5")
self.assertTrue(e5 in board.legal_moves)
board.push(e5)
Qf3 = chess.Move.from_uci("d1f3")
self.assertTrue(Qf3 in board.legal_moves)
board.push(Qf3)
Nc6 = chess.Move.from_uci("b8c6")
self.assertTrue(Nc6 in board.legal_moves)
board.push(Nc6)
Bc4 = chess.Move.from_uci("f1c4")
self.assertTrue(Bc4 in board.legal_moves)
board.push(Bc4)
Rb8 = chess.Move.from_uci("a8b8")
self.assertTrue(Rb8 in 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.assertTrue(Qf7_mate in board.legal_moves)
board.push(Qf7_mate)
self.assertTrue(board.is_check())
self.assertTrue(board.is_checkmate())
self.assertTrue(board.is_game_over())
self.assertFalse(board.is_stalemate())
self.assertEqual(board.fen(), "1rbqkbnr/pppp1Qpp/2n5/4p3/2B1P3/8/PPPP1PPP/RNB1K1NR b KQk - 0 4")
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 ambiguation.
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_variations(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.assertTrue('illegal move' in message.lower(),
msg="Error [{0}] mentions illegal move".format(message))
self.assertTrue('f3h6' in message,
msg="Illegal move f3h6 appears in message [{0}]".format(message))
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.assertTrue(chess.Move.from_uci("e1g1") in board.legal_moves)
self.assertTrue(chess.Move.from_uci("g7g8r") in board.legal_moves)
# Impossible promotion: Kb5, h7.
self.assertFalse(chess.Move.from_uci("a5b5q") in board.legal_moves)
self.assertFalse(chess.Move.from_uci("h6h7n") in board.legal_moves)
# Missing promotion.
self.assertFalse(chess.Move.from_uci("g7g8") in board.legal_moves)
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(len(board.pseudo_legal_moves), 8 + 4 + 3 + 2 + 1 + 6 + 9)
def test_polyglot(self):
# Test polyglot compability 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(board.zobrist_hash(), 0x463b96181691fc9c)
board.push_san("e4")
self.assertEqual(board.fen(), "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1")
self.assertEqual(board.zobrist_hash(), 0x823c9b50fd114196)
board.push_san("d5")
self.assertEqual(board.fen(), "rnbqkbnr/ppp1pppp/8/3p4/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2")
self.assertEqual(board.zobrist_hash(), 0x0756b94461c50fb0)
board.push_san("e5")
self.assertEqual(board.fen(), "rnbqkbnr/ppp1pppp/8/3pP3/8/8/PPPP1PPP/RNBQKBNR b KQkq - 0 2")
self.assertEqual(board.zobrist_hash(), 0x662fafb965db29d4)
board.push_san("f5")
self.assertEqual(board.fen(), "rnbqkbnr/ppp1p1pp/8/3pPp2/8/8/PPPP1PPP/RNBQKBNR w KQkq f6 0 3")
self.assertEqual(board.zobrist_hash(), 0x22a48b5a8e47ff78)
board.push_san("Ke2")
self.assertEqual(board.fen(), "rnbqkbnr/ppp1p1pp/8/3pPp2/8/8/PPPPKPPP/RNBQ1BNR b kq - 1 3")
self.assertEqual(board.zobrist_hash(), 0x652a607ca3f242c1)
board.push_san("Kf7")
self.assertEqual(board.fen(), "rnbq1bnr/ppp1pkpp/8/3pPp2/8/8/PPPPKPPP/RNBQ1BNR w - - 2 4")
self.assertEqual(board.zobrist_hash(), 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(board.zobrist_hash(), 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(board.zobrist_hash(), 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.assertFalse(illegal_move in board.legal_moves)
self.assertFalse(illegal_move in list(board.legal_moves))
self.assertFalse(illegal_move in board.pseudo_legal_moves)
self.assertFalse(illegal_move in 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.assertFalse(illegal_move in board.pseudo_legal_moves)
self.assertFalse(illegal_move in board.generate_pseudo_legal_moves())
self.assertFalse(illegal_move in board.legal_moves)
self.assertFalse(illegal_move in 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.assertFalse(illegal_move in board.pseudo_legal_moves)
self.assertFalse(illegal_move in board.generate_pseudo_legal_moves())
self.assertFalse(illegal_move in board.legal_moves)
self.assertFalse(illegal_move in 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.assertTrue(move in board.generate_pseudo_legal_moves())
self.assertTrue(board.is_pseudo_legal(move))
self.assertTrue(move in 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)
def test_epd(self):
# Create an EPD with a move and a string.
board = chess.Board("1k1r4/pp1b1R2/3q2pp/4p3/2B5/4Q3/PPP2B2/2K5 b - - 0 1")
epd = board.epd(bm=chess.Move(chess.D6, chess.D1), id="BK.01")
self.assertTrue(epd in (
"1k1r4/pp1b1R2/3q2pp/4p3/2B5/4Q3/PPP2B2/2K5 b - - bm Qd1+; id \"BK.01\";",
"1k1r4/pp1b1R2/3q2pp/4p3/2B5/4Q3/PPP2B2/2K5 b - - id \"BK.01\"; bm Qd1+;"))
# Create an EPD with a noop.
board = chess.Board("4k3/8/8/8/8/8/8/4K3 w - - 0 1")
self.assertEqual(board.epd(noop=None), "4k3/8/8/8/8/8/8/4K3 w - - noop;")
# Create an EPD with a variation.
board = chess.Board("k7/8/8/8/8/8/4PPPP/4K1NR w K - 0 1")
epd = board.epd(pv=[
chess.Move.from_uci("g1f3"), # Nf3
chess.Move.from_uci("a8a7"), # Ka7
chess.Move.from_uci("e1h1"), # O-O
])
self.assertEqual(epd, "k7/8/8/8/8/8/4PPPP/4K1NR w K - pv Nf3 Ka7 O-O;")
# Create an EPD with a set of moves.
board = chess.Board("8/8/8/4k3/8/1K6/8/8 b - - 0 1")
epd = board.epd(bm=[
chess.Move.from_uci("e5e6"), # Ke6
chess.Move.from_uci("e5e4"), # Ke4
])
self.assertEqual(epd, "8/8/8/4k3/8/1K6/8/8 b - - bm Ke6 Ke4;")
# Test loading an EPD.
board = chess.Board()
operations = board.set_epd("r2qnrnk/p2b2b1/1p1p2pp/2pPpp2/1PP1P3/PRNBB3/3QNPPP/5RK1 w - - bm f4; id \"BK.24\";")
self.assertEqual(board.fen(), "r2qnrnk/p2b2b1/1p1p2pp/2pPpp2/1PP1P3/PRNBB3/3QNPPP/5RK1 w - - 0 1")
self.assertTrue(chess.Move(chess.F2, chess.F4) in operations["bm"])
self.assertEqual(operations["id"], "BK.24")
# Test loading an EPD with half counter operations.
board = chess.Board()
operations = board.set_epd("4k3/8/8/8/8/8/8/4K3 b - - fmvn 17; hmvc 13")
self.assertEqual(board.fen(), "4k3/8/8/8/8/8/8/4K3 b - - 13 17")
self.assertEqual(operations["fmvn"], 17)
self.assertEqual(operations["hmvc"], 13)
# Test context of parsed SANs.
board = chess.Board()
operations = board.set_epd("4k3/8/8/2N5/8/8/8/4K3 w - - test Ne4")
self.assertEqual(operations["test"], chess.Move(chess.C5, chess.E4))
# Test parsing EPD with a set of moves.
board = chess.Board()
operations = board.set_epd("4k3/8/3QK3/8/8/8/8/8 w - - bm Qe7# Qb8#;")
self.assertEqual(board.fen(), "4k3/8/3QK3/8/8/8/8/8 w - - 0 1")
self.assertEqual(len(operations["bm"]), 2)
self.assertTrue(chess.Move.from_uci("d6b8") in operations["bm"])
self.assertTrue(chess.Move.from_uci("d6e7") in operations["bm"])
# Test parsing EPD with a stack of moves.
board = chess.Board()
operations = board.set_epd("6k1/1p6/6K1/8/8/8/8/7Q w - - pv Qh7+ Kf8 Qf7#;")
self.assertEqual(len(operations["pv"]), 3)
self.assertEqual(operations["pv"][0], chess.Move.from_uci("h1h7"))
self.assertEqual(operations["pv"][1], chess.Move.from_uci("g8f8"))
self.assertEqual(operations["pv"][2], chess.Move.from_uci("h7f7"))
def test_null_moves(self):
self.assertEqual(str(chess.Move.null()), "0000")
self.assertEqual(chess.Move.null().uci(), "0000")
self.assertFalse(chess.Move.null())
fen = "rnbqkbnr/ppp1pppp/8/2Pp4/8/8/PP1PPPPP/RNBQKBNR w KQkq d6 0 2"
board = chess.Board(fen)
self.assertEqual(chess.Move.from_uci("0000"), board.push_san("--"))
self.assertEqual(board.fen(), "rnbqkbnr/ppp1pppp/8/2Pp4/8/8/PP1PPPPP/RNBQKBNR b KQkq - 1 2")
self.assertEqual(chess.Move.null(), board.pop())
self.assertEqual(board.fen(), fen)
def test_attackers(self):
board = chess.Board("r1b1k2r/pp1n1ppp/2p1p3/q5B1/1b1P4/P1n1PN2/1P1Q1PPP/2R1KB1R b Kkq - 3 10")
attackers = board.attackers(chess.WHITE, chess.C3)
self.assertEqual(len(attackers), 3)
self.assertTrue(chess.C1 in attackers)
self.assertTrue(chess.D2 in attackers)
self.assertTrue(chess.B2 in attackers)
self.assertFalse(chess.D4 in attackers)
self.assertFalse(chess.E1 in attackers)
def test_en_passant_attackers(self):
board = chess.Board("4k3/8/8/8/4pPp1/8/8/4K3 b - f3 0 1")
# Still attacking the en passant square.
attackers = board.attackers(chess.BLACK, chess.F3)
self.assertEqual(len(attackers), 2)
self.assertTrue(chess.E4 in attackers)
self.assertTrue(chess.G4 in attackers)
# Also attacking the pawn.
attackers = board.attackers(chess.BLACK, chess.F4)
self.assertEqual(len(attackers), 2)
self.assertTrue(chess.E4 in attackers)
self.assertTrue(chess.G4 in attackers)
def test_attacks(self):
board = chess.Board("5rk1/p5pp/2p3p1/1p1pR3/3P2P1/2N5/PP3n2/2KB4 w - - 1 26")
attacks = board.attacks(chess.E5)
self.assertEqual(len(attacks), 11)
self.assertTrue(chess.D5 in attacks)
self.assertTrue(chess.E1 in attacks)
self.assertTrue(chess.F5 in attacks)
self.assertFalse(chess.E5 in attacks)
self.assertFalse(chess.C5 in attacks)
self.assertFalse(chess.F4 in attacks)
self.assertFalse(board.attacks(chess.G1))
def test_clear(self):
board = chess.Board()
board.clear()
self.assertEqual(board.turn, chess.WHITE)
self.assertEqual(board.fullmove_number, 1)
self.assertEqual(board.halfmove_clock, 0)
self.assertEqual(board.castling_rights, chess.BB_VOID)
self.assertFalse(board.ep_square)
self.assertFalse(board.piece_at(chess.E1))
self.assertEqual(chess.pop_count(board.occupied), 0)
def test_threefold_repetition(self):
board = chess.Board()
# Go back and forth with the nights to reach the starting position
# for a second time.
self.assertFalse(board.can_claim_threefold_repetition())
board.push_san("Nf3")
self.assertFalse(board.can_claim_threefold_repetition())
board.push_san("Nf6")
self.assertFalse(board.can_claim_threefold_repetition())
board.push_san("Ng1")
self.assertFalse(board.can_claim_threefold_repetition())
board.push_san("Ng8")
# Once more.
self.assertFalse(board.can_claim_threefold_repetition())
board.push_san("Nf3")
self.assertFalse(board.can_claim_threefold_repetition())
board.push_san("Nf6")
self.assertFalse(board.can_claim_threefold_repetition())
board.push_san("Ng1")
# Now black can go back to the starting position (thus reaching it a
# third time.)
self.assertTrue(board.can_claim_threefold_repetition())
board.push_san("Ng8")
# They indee do it. Also white can now claim.
self.assertTrue(board.can_claim_threefold_repetition())
# But not after a different move.
board.push_san("e4")
self.assertFalse(board.can_claim_threefold_repetition())
# Undo moves and check if everything works backwards.
board.pop() # e4
self.assertTrue(board.can_claim_threefold_repetition())
board.pop() # Ng8
self.assertTrue(board.can_claim_threefold_repetition())
while board.move_stack:
board.pop()
self.assertFalse(board.can_claim_threefold_repetition())
def test_fivefold_repetition(self):
fen = "rnbq1rk1/ppp3pp/3bpn2/3p1p2/2PP4/2NBPN2/PP3PPP/R1BQK2R w KQ - 3 7"
board = chess.Board(fen)
# Repeat the position up to the fourth time.
for i in range(3):
board.push_san("Be2")
self.assertFalse(board.is_fivefold_repetition())
board.push_san("Ne4")
self.assertFalse(board.is_fivefold_repetition())
board.push_san("Bd3")
self.assertFalse(board.is_fivefold_repetition())
board.push_san("Nf6")
self.assertEqual(board.fen().split()[0], fen.split()[0])
self.assertFalse(board.is_fivefold_repetition())
self.assertFalse(board.is_game_over())
# Repeat it once more. Now it is a five-fold repetition.
board.push_san("Be2")
self.assertFalse(board.is_fivefold_repetition())
board.push_san("Ne4")
self.assertFalse(board.is_fivefold_repetition())
board.push_san("Bd3")
self.assertFalse(board.is_fivefold_repetition())
board.push_san("Nf6")
self.assertEqual(board.fen().split()[0], fen.split()[0])
self.assertTrue(board.is_fivefold_repetition())
self.assertTrue(board.is_game_over())
# It is also a threefold repetition.
self.assertTrue(board.can_claim_threefold_repetition())
# Now no longer.
board.push_san("Qc2")
board.push_san("Qd7")
self.assertFalse(board.can_claim_threefold_repetition())
self.assertFalse(board.is_fivefold_repetition())
board.push_san("Qd2")
board.push_san("Qe7")
self.assertFalse(board.can_claim_threefold_repetition())
self.assertFalse(board.is_fivefold_repetition())
# Give the possibility to repeat.
board.push_san("Qd1")
self.assertFalse(board.is_fivefold_repetition())
self.assertTrue(board.can_claim_threefold_repetition())
# Do in fact repeat.
self.assertFalse(board.is_fivefold_repetition())
board.push_san("Qd8")
# This is a threefold repetition but not a fivefold repetition, because
# consecutive moves are required for that.
self.assertTrue(board.can_claim_threefold_repetition())
self.assertFalse(board.is_fivefold_repetition())
self.assertEqual(board.fen().split()[0], fen.split()[0])
def test_fifty_moves(self):
# Test positions from Timman - Lutz (1995).
board = chess.Board()
self.assertFalse(board.can_claim_fifty_moves())
board = chess.Board("8/5R2/8/r2KB3/6k1/8/8/8 w - - 19 79")
self.assertFalse(board.can_claim_fifty_moves())
board = chess.Board("8/8/6r1/4B3/8/4K2k/5R2/8 b - - 68 103")
self.assertFalse(board.can_claim_fifty_moves())
board = chess.Board("6R1/7k/8/8/1r3B2/5K2/8/8 w - - 99 119")
self.assertFalse(board.can_claim_fifty_moves())
board = chess.Board("8/7k/8/6R1/1r3B2/5K2/8/8 b - - 100 119")
self.assertTrue(board.can_claim_fifty_moves())
board = chess.Board("8/7k/8/1r3KR1/5B2/8/8/8 w - - 105 122")
self.assertTrue(board.can_claim_fifty_moves())
# Once checkmated it is too late to claim.
board = chess.Board("k7/8/NKB5/8/8/8/8/8 b - - 105 176")
self.assertFalse(board.can_claim_fifty_moves())
# A stalemate is a draw, but you can not and do not need to claim it by
# the fifty move rule.
board = chess.Board("k7/3N4/1K6/1B6/8/8/8/8 b - - 99 1")
self.assertTrue(board.is_stalemate())
self.assertTrue(board.is_game_over())
self.assertFalse(board.can_claim_fifty_moves())
self.assertFalse(board.can_claim_draw())
def test_ep_legality(self):
move = chess.Move.from_uci("h5g6")
board = chess.Board("rnbqkbnr/pppppp2/7p/6pP/8/8/PPPPPPP1/RNBQKBNR w KQkq g6 0 3")
self.assertTrue(board.is_legal(move))
board.push_san("Nf3")
self.assertFalse(board.is_legal(move))
board.push_san("Nf6")
self.assertFalse(board.is_legal(move))
move = chess.Move.from_uci("c4d3")
board = chess.Board("rnbqkbnr/pp1ppppp/8/8/2pP4/2P2N2/PP2PPPP/RNBQKB1R b KQkq d3 0 3")
self.assertTrue(board.is_legal(move))
board.push_san("Qc7")
self.assertFalse(board.is_legal(move))
board.push_san("Bd2")
self.assertFalse(board.is_legal(move))
def test_pseudo_legality(self):
sample_moves = [
chess.Move(chess.A2, chess.A4),
chess.Move(chess.C1, chess.E3),
chess.Move(chess.G8, chess.F6),
chess.Move(chess.D7, chess.D8, chess.QUEEN),
chess.Move(chess.E5, chess.E4),
]
sample_fens = [
chess.STARTING_FEN,
"rnbqkbnr/pp1ppppp/2p5/8/6P1/2P5/PP1PPP1P/RNBQKBNR b KQkq - 0 1",
"rnb1kbnr/ppq1pppp/2pp4/8/6P1/2P5/PP1PPPBP/RNBQK1NR w KQkq - 0 1",
"rn2kbnr/p1q1ppp1/1ppp3p/8/4B1b1/2P4P/PPQPPP2/RNB1K1NR w KQkq - 0 1",
"rnkq1bnr/p3ppp1/1ppp3p/3B4/6b1/2PQ3P/PP1PPP2/RNB1K1NR w KQ - 0 1",
"rn1q1bnr/3kppp1/2pp3p/pp6/1P2b3/2PQ1N1P/P2PPPB1/RNB1K2R w KQ - 0 1",
"rnkq1bnr/4pp2/2pQ2pp/pp6/1P5N/2P4P/P2PPP2/RNB1KB1b w Q - 0 1",
"rn3b1r/1kq1p3/2pQ1npp/Pp6/4b3/2PPP2P/P4P2/RNB1KB2 w Q - 0 1",
"r4br1/8/k1p2npp/Ppn1p3/P7/2PPP1qP/4bPQ1/RNB1KB2 w Q - 0 1",
"rnbqk1nr/p2p3p/1p5b/2pPppp1/8/P7/1PPQPPPP/RNB1KBNR w KQkq c6 0 1",
"rnb1k2r/pp1p1p1p/1q1P4/2pnpPp1/6P1/2N5/PP1BP2P/R2QKBNR w KQkq e6 0 1",
"1n4kr/2B4p/2nb2b1/ppp5/P1PpP3/3P4/5K2/1N1R4 b - c3 0 1",
"r2n3r/1bNk2pp/6P1/pP3p2/3pPqnP/1P1P1p1R/2P3B1/Q1B1bKN1 b - e3 0 1",
]
for sample_fen in sample_fens:
board = chess.Board(sample_fen)
pseudo_legal_moves = list(board.generate_pseudo_legal_moves())
# Ensure that all moves generated as pseudo legal pass the pseudo-
# legality check.
for move in pseudo_legal_moves:
self.assertTrue(board.is_pseudo_legal(move))
# Check that moves not generated as pseudo legal do not pass the
# pseudo legality check.
for move in sample_moves:
if move not in pseudo_legal_moves:
self.assertFalse(board.is_pseudo_legal(move))
def test_pieces(self):
board = chess.Board()
king = board.pieces(chess.KING, chess.WHITE)
self.assertTrue(chess.E1 in king)
self.assertEqual(len(king), 1)