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# Copyright 2018 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import numpy as np
import unittest
import coords
from go import Position, PlayerMove, LibertyTracker, WHITE, BLACK, EMPTY
import go
import sgf_wrapper
from tests import test_utils
EMPTY_ROW = '.' * go.N + '\n'
TEST_BOARD = test_utils.load_board('''
.X.....OO
X........
''' + EMPTY_ROW * 7)
NO_HANDICAP_SGF = "(;CA[UTF-8]SZ[9]PB[Murakawa Daisuke]PW[Iyama Yuta]KM[6.5]HA[0]RE[W+1.5]GM[1];B[fd];W[cf];B[eg];W[dd];B[dc];W[cc];B[de];W[cd];B[ed];W[he];B[ce];W[be];B[df];W[bf];B[hd];W[ge];B[gd];W[gg];B[db];W[cb];B[cg];W[bg];B[gh];W[fh];B[hh];W[fg];B[eh];W[ei];B[di];W[fi];B[hg];W[dh];B[ch];W[ci];B[bh];W[ff];B[fe];W[hf];B[id];W[bi];B[ah];W[ef];B[dg];W[ee];B[di];W[ig];B[ai];W[ih];B[fb];W[hi];B[ag];W[ab];B[bd];W[bc];B[ae];W[ad];B[af];W[bd];B[ca];W[ba];B[da];W[ie])"
def coords_from_kgs_set(string):
return frozenset(map(coords.from_kgs, string.split()))
class TestBasicFunctions(test_utils.MiniGoUnitTest):
def test_load_board(self):
self.assertEqualNPArray(go.EMPTY_BOARD, np.zeros([go.N, go.N]))
self.assertEqualNPArray(
go.EMPTY_BOARD, test_utils.load_board('. \n' * go.N ** 2))
def test_neighbors(self):
corner = coords.from_kgs('A1')
neighbors = [go.EMPTY_BOARD[c] for c in go.NEIGHBORS[corner]]
self.assertEqual(len(neighbors), 2)
side = coords.from_kgs('A2')
side_neighbors = [go.EMPTY_BOARD[c] for c in go.NEIGHBORS[side]]
self.assertEqual(len(side_neighbors), 3)
def test_is_koish(self):
self.assertEqual(go.is_koish(
TEST_BOARD, coords.from_kgs('A9')), BLACK)
self.assertEqual(go.is_koish(TEST_BOARD, coords.from_kgs('B8')), None)
self.assertEqual(go.is_koish(TEST_BOARD, coords.from_kgs('B9')), None)
self.assertEqual(go.is_koish(TEST_BOARD, coords.from_kgs('E5')), None)
def test_is_eyeish(self):
board = test_utils.load_board('''
.XX...XXX
X.X...X.X
XX.....X.
........X
XXXX.....
OOOX....O
X.OXX.OO.
.XO.X.O.O
XXO.X.OO.
''')
B_eyes = coords_from_kgs_set('A2 A9 B8 J7 H8')
W_eyes = coords_from_kgs_set('H2 J1 J3')
not_eyes = coords_from_kgs_set('B3 E5')
for be in B_eyes:
self.assertEqual(go.is_eyeish(board, be), BLACK, str(be))
for we in W_eyes:
self.assertEqual(go.is_eyeish(board, we), WHITE, str(we))
for ne in not_eyes:
self.assertEqual(go.is_eyeish(board, ne), None, str(ne))
class TestLibertyTracker(test_utils.MiniGoUnitTest):
def test_lib_tracker_init(self):
board = test_utils.load_board('X........' + EMPTY_ROW * 8)
lib_tracker = LibertyTracker.from_board(board)
self.assertEqual(len(lib_tracker.groups), 1)
self.assertNotEqual(
lib_tracker.group_index[coords.from_kgs('A9')], go.MISSING_GROUP_ID)
self.assertEqual(lib_tracker.liberty_cache[coords.from_kgs('A9')], 2)
sole_group = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'A9')]]
self.assertEqual(sole_group.stones, coords_from_kgs_set('A9'))
self.assertEqual(sole_group.liberties, coords_from_kgs_set('B9 A8'))
self.assertEqual(sole_group.color, BLACK)
def test_place_stone(self):
board = test_utils.load_board('X........' + EMPTY_ROW * 8)
lib_tracker = LibertyTracker.from_board(board)
lib_tracker.add_stone(BLACK, coords.from_kgs('B9'))
self.assertEqual(len(lib_tracker.groups), 1)
self.assertNotEqual(
lib_tracker.group_index[coords.from_kgs('A9')], go.MISSING_GROUP_ID)
self.assertEqual(lib_tracker.liberty_cache[coords.from_kgs('A9')], 3)
self.assertEqual(lib_tracker.liberty_cache[coords.from_kgs('B9')], 3)
sole_group = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'A9')]]
self.assertEqual(sole_group.stones, coords_from_kgs_set('A9 B9'))
self.assertEqual(sole_group.liberties,
coords_from_kgs_set('C9 A8 B8'))
self.assertEqual(sole_group.color, BLACK)
def test_place_stone_opposite_color(self):
board = test_utils.load_board('X........' + EMPTY_ROW * 8)
lib_tracker = LibertyTracker.from_board(board)
lib_tracker.add_stone(WHITE, coords.from_kgs('B9'))
self.assertEqual(len(lib_tracker.groups), 2)
self.assertNotEqual(
lib_tracker.group_index[coords.from_kgs('A9')], go.MISSING_GROUP_ID)
self.assertNotEqual(
lib_tracker.group_index[coords.from_kgs('B9')], go.MISSING_GROUP_ID)
self.assertEqual(lib_tracker.liberty_cache[coords.from_kgs('A9')], 1)
self.assertEqual(lib_tracker.liberty_cache[coords.from_kgs('B9')], 2)
black_group = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'A9')]]
white_group = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'B9')]]
self.assertEqual(black_group.stones, coords_from_kgs_set('A9'))
self.assertEqual(black_group.liberties, coords_from_kgs_set('A8'))
self.assertEqual(black_group.color, BLACK)
self.assertEqual(white_group.stones, coords_from_kgs_set('B9'))
self.assertEqual(white_group.liberties, coords_from_kgs_set('C9 B8'))
self.assertEqual(white_group.color, WHITE)
def test_merge_multiple_groups(self):
board = test_utils.load_board('''
.X.......
X.X......
.X.......
''' + EMPTY_ROW * 6)
lib_tracker = LibertyTracker.from_board(board)
lib_tracker.add_stone(BLACK, coords.from_kgs('B8'))
self.assertEqual(len(lib_tracker.groups), 1)
self.assertNotEqual(
lib_tracker.group_index[coords.from_kgs('B8')], go.MISSING_GROUP_ID)
sole_group = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'B8')]]
self.assertEqual(sole_group.stones,
coords_from_kgs_set('B9 A8 B8 C8 B7'))
self.assertEqual(sole_group.liberties,
coords_from_kgs_set('A9 C9 D8 A7 C7 B6'))
self.assertEqual(sole_group.color, BLACK)
liberty_cache = lib_tracker.liberty_cache
for stone in sole_group.stones:
self.assertEqual(liberty_cache[stone], 6, str(stone))
def test_capture_stone(self):
board = test_utils.load_board('''
.X.......
XO.......
.X.......
''' + EMPTY_ROW * 6)
lib_tracker = LibertyTracker.from_board(board)
captured = lib_tracker.add_stone(BLACK, coords.from_kgs('C8'))
self.assertEqual(len(lib_tracker.groups), 4)
self.assertEqual(
lib_tracker.group_index[coords.from_kgs('B8')], go.MISSING_GROUP_ID)
self.assertEqual(captured, coords_from_kgs_set('B8'))
def test_capture_many(self):
board = test_utils.load_board('''
.XX......
XOO......
.XX......
''' + EMPTY_ROW * 6)
lib_tracker = LibertyTracker.from_board(board)
captured = lib_tracker.add_stone(BLACK, coords.from_kgs('D8'))
self.assertEqual(len(lib_tracker.groups), 4)
self.assertEqual(
lib_tracker.group_index[coords.from_kgs('B8')], go.MISSING_GROUP_ID)
self.assertEqual(captured, coords_from_kgs_set('B8 C8'))
left_group = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'A8')]]
self.assertEqual(left_group.stones, coords_from_kgs_set('A8'))
self.assertEqual(left_group.liberties,
coords_from_kgs_set('A9 B8 A7'))
right_group = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'D8')]]
self.assertEqual(right_group.stones, coords_from_kgs_set('D8'))
self.assertEqual(right_group.liberties,
coords_from_kgs_set('D9 C8 E8 D7'))
top_group = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'B9')]]
self.assertEqual(top_group.stones, coords_from_kgs_set('B9 C9'))
self.assertEqual(top_group.liberties,
coords_from_kgs_set('A9 D9 B8 C8'))
bottom_group = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'B7')]]
self.assertEqual(bottom_group.stones, coords_from_kgs_set('B7 C7'))
self.assertEqual(bottom_group.liberties,
coords_from_kgs_set('B8 C8 A7 D7 B6 C6'))
liberty_cache = lib_tracker.liberty_cache
for stone in top_group.stones:
self.assertEqual(liberty_cache[stone], 4, str(stone))
for stone in left_group.stones:
self.assertEqual(liberty_cache[stone], 3, str(stone))
for stone in right_group.stones:
self.assertEqual(liberty_cache[stone], 4, str(stone))
for stone in bottom_group.stones:
self.assertEqual(liberty_cache[stone], 6, str(stone))
for stone in captured:
self.assertEqual(liberty_cache[stone], 0, str(stone))
def test_capture_multiple_groups(self):
board = test_utils.load_board('''
.OX......
OXX......
XX.......
''' + EMPTY_ROW * 6)
lib_tracker = LibertyTracker.from_board(board)
captured = lib_tracker.add_stone(BLACK, coords.from_kgs('A9'))
self.assertEqual(len(lib_tracker.groups), 2)
self.assertEqual(captured, coords_from_kgs_set('B9 A8'))
corner_stone = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'A9')]]
self.assertEqual(corner_stone.stones, coords_from_kgs_set('A9'))
self.assertEqual(corner_stone.liberties, coords_from_kgs_set('B9 A8'))
surrounding_stones = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'C9')]]
self.assertEqual(surrounding_stones.stones,
coords_from_kgs_set('C9 B8 C8 A7 B7'))
self.assertEqual(surrounding_stones.liberties,
coords_from_kgs_set('B9 D9 A8 D8 C7 A6 B6'))
liberty_cache = lib_tracker.liberty_cache
for stone in corner_stone.stones:
self.assertEqual(liberty_cache[stone], 2, str(stone))
for stone in surrounding_stones.stones:
self.assertEqual(liberty_cache[stone], 7, str(stone))
def test_same_friendly_group_neighboring_twice(self):
board = test_utils.load_board('''
XX.......
X........
''' + EMPTY_ROW * 7)
lib_tracker = LibertyTracker.from_board(board)
captured = lib_tracker.add_stone(BLACK, coords.from_kgs('B8'))
self.assertEqual(len(lib_tracker.groups), 1)
sole_group_id = lib_tracker.group_index[coords.from_kgs('A9')]
sole_group = lib_tracker.groups[sole_group_id]
self.assertEqual(sole_group.stones,
coords_from_kgs_set('A9 B9 A8 B8'))
self.assertEqual(sole_group.liberties,
coords_from_kgs_set('C9 C8 A7 B7'))
self.assertEqual(captured, set())
def test_same_opponent_group_neighboring_twice(self):
board = test_utils.load_board('''
XX.......
X........
''' + EMPTY_ROW * 7)
lib_tracker = LibertyTracker.from_board(board)
captured = lib_tracker.add_stone(WHITE, coords.from_kgs('B8'))
self.assertEqual(len(lib_tracker.groups), 2)
black_group = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'A9')]]
self.assertEqual(black_group.stones, coords_from_kgs_set('A9 B9 A8'))
self.assertEqual(black_group.liberties, coords_from_kgs_set('C9 A7'))
white_group = lib_tracker.groups[lib_tracker.group_index[coords.from_kgs(
'B8')]]
self.assertEqual(white_group.stones, coords_from_kgs_set('B8'))
self.assertEqual(white_group.liberties, coords_from_kgs_set('C8 B7'))
self.assertEqual(captured, set())
class TestPosition(test_utils.MiniGoUnitTest):
def test_passing(self):
start_position = Position(
board=TEST_BOARD,
n=0,
komi=6.5,
caps=(1, 2),
ko=coords.from_kgs('A1'),
recent=tuple(),
to_play=BLACK,
)
expected_position = Position(
board=TEST_BOARD,
n=1,
komi=6.5,
caps=(1, 2),
ko=None,
recent=(PlayerMove(BLACK, None),),
to_play=WHITE,
)
pass_position = start_position.pass_move()
self.assertEqualPositions(pass_position, expected_position)
def test_flipturn(self):
start_position = Position(
board=TEST_BOARD,
n=0,
komi=6.5,
caps=(1, 2),
ko=coords.from_kgs('A1'),
recent=tuple(),
to_play=BLACK,
)
expected_position = Position(
board=TEST_BOARD,
n=0,
komi=6.5,
caps=(1, 2),
ko=None,
recent=tuple(),
to_play=WHITE,
)
flip_position = start_position.flip_playerturn()
self.assertEqualPositions(flip_position, expected_position)
def test_is_move_suicidal(self):
board = test_utils.load_board('''
...O.O...
....O....
XO.....O.
OXO...OXO
O.XO.OX.O
OXO...OOX
XO.......
......XXO
.....XOO.
''')
position = Position(
board=board,
to_play=BLACK,
)
suicidal_moves = coords_from_kgs_set('E9 H5')
nonsuicidal_moves = coords_from_kgs_set('B5 J1 A9')
for move in suicidal_moves:
# sanity check my coordinate input
assert(position.board[move] == go.EMPTY)
self.assertTrue(position.is_move_suicidal(move), str(move))
for move in nonsuicidal_moves:
# sanity check my coordinate input
assert(position.board[move] == go.EMPTY)
self.assertFalse(position.is_move_suicidal(move), str(move))
def test_legal_moves(self):
board = test_utils.load_board('''
.O.O.XOX.
O..OOOOOX
......O.O
OO.....OX
XO.....X.
.O.......
OX.....OO
XX...OOOX
.....O.X.
''')
position = Position(board=board, to_play=BLACK)
illegal_moves = coords_from_kgs_set('A9 E9 J9')
legal_moves = coords_from_kgs_set('A4 G1 J1 H7') | {None}
for move in illegal_moves:
with self.subTest(type='illegal', move=move):
self.assertFalse(position.is_move_legal(move))
for move in legal_moves:
with self.subTest(type='legal', move=move):
self.assertTrue(position.is_move_legal(move))
# check that the bulk legal test agrees with move-by-move illegal test.
bulk_legality = position.all_legal_moves()
for i, bulk_legal in enumerate(bulk_legality):
with self.subTest(type='bulk', move=coords.from_flat(i)):
self.assertEqual(
bulk_legal, position.is_move_legal(coords.from_flat(i)))
# flip the colors and check that everything is still (il)legal
position = Position(board=-board, to_play=WHITE)
for move in illegal_moves:
with self.subTest(type='illegal', move=move):
self.assertFalse(position.is_move_legal(move))
for move in legal_moves:
with self.subTest(type='legal', move=move):
self.assertTrue(position.is_move_legal(move))
bulk_legality = position.all_legal_moves()
for i, bulk_legal in enumerate(bulk_legality):
with self.subTest(type='bulk', move=coords.from_flat(i)):
self.assertEqual(
bulk_legal, position.is_move_legal(coords.from_flat(i)))
def test_move(self):
start_position = Position(
board=TEST_BOARD,
n=0,
komi=6.5,
caps=(1, 2),
ko=None,
recent=tuple(),
to_play=BLACK,
)
expected_board = test_utils.load_board('''
.XX....OO
X........
''' + EMPTY_ROW * 7)
expected_position = Position(
board=expected_board,
n=1,
komi=6.5,
caps=(1, 2),
ko=None,
recent=(PlayerMove(BLACK, coords.from_kgs('C9')),),
to_play=WHITE,
)
actual_position = start_position.play_move(coords.from_kgs('C9'))
self.assertEqualPositions(actual_position, expected_position)
expected_board2 = test_utils.load_board('''
.XX....OO
X.......O
''' + EMPTY_ROW * 7)
expected_position2 = Position(
board=expected_board2,
n=2,
komi=6.5,
caps=(1, 2),
ko=None,
recent=(PlayerMove(BLACK, coords.from_kgs('C9')),
PlayerMove(WHITE, coords.from_kgs('J8'))),
to_play=BLACK,
)
actual_position2 = actual_position.play_move(coords.from_kgs('J8'))
self.assertEqualPositions(actual_position2, expected_position2)
def test_move_with_capture(self):
start_board = test_utils.load_board(EMPTY_ROW * 5 + '''
XXXX.....
XOOX.....
O.OX.....
OOXX.....
''')
start_position = Position(
board=start_board,
n=0,
komi=6.5,
caps=(1, 2),
ko=None,
recent=tuple(),
to_play=BLACK,
)
expected_board = test_utils.load_board(EMPTY_ROW * 5 + '''
XXXX.....
X..X.....
.X.X.....
..XX.....
''')
expected_position = Position(
board=expected_board,
n=1,
komi=6.5,
caps=(7, 2),
ko=None,
recent=(PlayerMove(BLACK, coords.from_kgs('B2')),),
to_play=WHITE,
)
actual_position = start_position.play_move(coords.from_kgs('B2'))
self.assertEqualPositions(actual_position, expected_position)
def test_ko_move(self):
start_board = test_utils.load_board('''
.OX......
OX.......
''' + EMPTY_ROW * 7)
start_position = Position(
board=start_board,
n=0,
komi=6.5,
caps=(1, 2),
ko=None,
recent=tuple(),
to_play=BLACK,
)
expected_board = test_utils.load_board('''
X.X......
OX.......
''' + EMPTY_ROW * 7)
expected_position = Position(
board=expected_board,
n=1,
komi=6.5,
caps=(2, 2),
ko=coords.from_kgs('B9'),
recent=(PlayerMove(BLACK, coords.from_kgs('A9')),),
to_play=WHITE,
)
actual_position = start_position.play_move(coords.from_kgs('A9'))
self.assertEqualPositions(actual_position, expected_position)
# Check that retaking ko is illegal until two intervening moves
with self.assertRaises(go.IllegalMove):
actual_position.play_move(coords.from_kgs('B9'))
pass_twice = actual_position.pass_move().pass_move()
ko_delayed_retake = pass_twice.play_move(coords.from_kgs('B9'))
expected_position = Position(
board=start_board,
n=4,
komi=6.5,
caps=(2, 3),
ko=coords.from_kgs('A9'),
recent=(
PlayerMove(BLACK, coords.from_kgs('A9')),
PlayerMove(WHITE, None),
PlayerMove(BLACK, None),
PlayerMove(WHITE, coords.from_kgs('B9'))),
to_play=BLACK,
)
self.assertEqualPositions(ko_delayed_retake, expected_position)
def test_is_game_over(self):
root = go.Position()
self.assertFalse(root.is_game_over())
first_pass = root.play_move(None)
self.assertFalse(first_pass.is_game_over())
second_pass = first_pass.play_move(None)
self.assertTrue(second_pass.is_game_over())
def test_scoring(self):
board = test_utils.load_board('''
.XX......
OOXX.....
OOOX...X.
OXX......
OOXXXXXX.
OOOXOXOXX
.O.OOXOOX
.O.O.OOXX
......OOO
''')
position = Position(
board=board,
n=54,
komi=6.5,
caps=(2, 5),
ko=None,
recent=tuple(),
to_play=BLACK,
)
expected_score = 1.5
self.assertEqual(position.score(), expected_score)
board = test_utils.load_board('''
XXX......
OOXX.....
OOOX...X.
OXX......
OOXXXXXX.
OOOXOXOXX
.O.OOXOOX
.O.O.OOXX
......OOO
''')
position = Position(
board=board,
n=55,
komi=6.5,
caps=(2, 5),
ko=None,
recent=tuple(),
to_play=WHITE,
)
expected_score = 2.5
self.assertEqual(position.score(), expected_score)
def test_replay_position(self):
sgf_positions = list(sgf_wrapper.replay_sgf(NO_HANDICAP_SGF))
initial = sgf_positions[0]
self.assertEqual(initial.result, go.WHITE)
final = sgf_positions[-1].position.play_move(
sgf_positions[-1].next_move)
# sanity check to ensure we're working with the right position
final_board = test_utils.load_board('''
.OXX.....
O.OX.X...
.OOX.....
OOOOXXXXX
XOXXOXOOO
XOOXOO.O.
XOXXXOOXO
XXX.XOXXO
X..XOO.O.
''')
expected_final_position = go.Position(
final_board,
n=62,
komi=6.5,
caps=(3, 2),
ko=None,
recent=tuple(),
to_play=go.BLACK
)
self.assertEqualPositions(expected_final_position, final)
self.assertEqual(final.n, len(final.recent))
replayed_positions = list(go.replay_position(final, 1))
for sgf_pos, replay_pos in zip(sgf_positions, replayed_positions):
self.assertEqualPositions(sgf_pos.position, replay_pos.position)