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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.
#include "cc/position.h"
#include <set>
#include <string>
#include <utility>
#include <vector>
#include "absl/strings/ascii.h"
#include "cc/constants.h"
#include "cc/test_utils.h"
#include "gtest/gtest.h"
namespace minigo {
namespace {
TEST(PositionTest, TestIsKoish) {
auto board = TestablePosition(R"(
.X.O.O.O.
X...O...O
...O.....
X.O.O...O
.X.O...X.
X.O..X...
.X.OX.X..
X.O..X..O
XX.....X.)");
std::set<std::string> expected_black_kos = {"A9", "A5", "A3", "F3"};
std::set<std::string> expected_white_kos = {"E9", "J9", "D6"};
for (int row = 0; row < kN; ++row) {
for (int col = 0; col < kN; ++col) {
auto c = Coord(row, col).ToKgs();
Color expected;
Color actual = board.IsKoish(c);
if (expected_white_kos.find(c) != expected_white_kos.end()) {
expected = Color::kWhite;
} else if (expected_black_kos.find(c) != expected_black_kos.end()) {
expected = Color::kBlack;
} else {
expected = Color::kEmpty;
}
EXPECT_EQ(expected, actual) << c;
}
}
}
TEST(PositionTest, TestMergeGroups1) {
auto board = TestablePosition(R"(
.X.
X.X
.X.)");
EXPECT_EQ(3, board.GroupAt("B9").num_liberties);
EXPECT_EQ(3, board.GroupAt("A8").num_liberties);
EXPECT_EQ(4, board.GroupAt("C8").num_liberties);
EXPECT_EQ(4, board.GroupAt("B7").num_liberties);
board.PlayMove("B8", Color::kBlack);
EXPECT_EQ(CleanBoardString(R"(
.X.
XXX
.X.)"),
board.ToSimpleString());
auto group = board.GroupAt("B8");
EXPECT_EQ(5, group.size);
EXPECT_EQ(6, group.num_liberties);
}
TEST(PositionTest, TestMergeGroups2) {
auto board = TestablePosition(R"(
.........
.........
.........
.........
.........
..O..O...
..O..O...
..O..O...
..OOO....)");
EXPECT_EQ(10, board.GroupAt("C1").num_liberties);
EXPECT_EQ(8, board.GroupAt("F2").num_liberties);
board.PlayMove("F1", Color::kWhite);
EXPECT_EQ(CleanBoardString(R"(
.........
.........
.........
.........
.........
..O..O...
..O..O...
..O..O...
..OOOO...)"),
board.ToSimpleString());
auto group = board.GroupAt("F4");
EXPECT_EQ(10, group.size);
EXPECT_EQ(16, group.num_liberties);
}
TEST(PositionTest, TestCaptureStone) {
auto board = TestablePosition(R"(
.........
.........
.........
.........
.........
.........
.......O.
......OX.
.......O.)");
board.PlayMove("J2", Color::kWhite);
std::array<int, 2> expected_captures = {0, 1};
EXPECT_EQ(expected_captures, board.num_captures());
EXPECT_EQ(CleanBoardString(R"(
.........
.........
.........
.........
.........
.........
.......O.
......O.O
.......O.)"),
board.ToSimpleString());
}
TEST(PositionTest, TestCaptureMany1) {
auto board = TestablePosition(R"(
.....
.....
..XX.
.XOO.
..XX.)");
EXPECT_EQ(4, board.GroupAt("C7").num_liberties);
EXPECT_EQ(3, board.GroupAt("B6").num_liberties);
EXPECT_EQ(1, board.GroupAt("C6").num_liberties);
EXPECT_EQ(4, board.GroupAt("D5").num_liberties);
board.PlayMove("E6", Color::kBlack);
std::array<int, 2> expected_captures = {2, 0};
EXPECT_EQ(expected_captures, board.num_captures());
EXPECT_EQ(CleanBoardString(R"(
.....
.....
..XX.
.X..X
..XX.)"),
board.ToSimpleString());
EXPECT_EQ(6, board.GroupAt("C7").num_liberties);
EXPECT_EQ(4, board.GroupAt("B6").num_liberties);
EXPECT_EQ(4, board.GroupAt("E6").num_liberties);
EXPECT_EQ(6, board.GroupAt("D5").num_liberties);
}
TEST(PositionTest, TestCaptureMany2) {
auto board = TestablePosition(R"(
..X..
.XOX.
XO.OX
.XOX.
..X..)");
board.PlayMove("C7", Color::kBlack);
std::array<int, 2> expected_captures = {4, 0};
EXPECT_EQ(expected_captures, board.num_captures());
EXPECT_EQ(CleanBoardString(R"(
..X..
.X.X.
X.X.X
.X.X.
..X..)"),
board.ToSimpleString());
EXPECT_EQ(3, board.GroupAt("C9").num_liberties);
EXPECT_EQ(4, board.GroupAt("B8").num_liberties);
EXPECT_EQ(4, board.GroupAt("D8").num_liberties);
EXPECT_EQ(3, board.GroupAt("A7").num_liberties);
EXPECT_EQ(4, board.GroupAt("B6").num_liberties);
EXPECT_EQ(4, board.GroupAt("D6").num_liberties);
EXPECT_EQ(4, board.GroupAt("C5").num_liberties);
}
TEST(PositionTest, TestCaptureMultipleGroups) {
auto board = TestablePosition(R"(
.OX
OXX
XX.)");
board.PlayMove("A9", Color::kBlack);
std::array<int, 2> expected_captures = {2, 0};
EXPECT_EQ(expected_captures, board.num_captures());
EXPECT_EQ(CleanBoardString(R"(
X.X
.XX
XX.)"),
board.ToSimpleString());
EXPECT_EQ(2, board.GroupAt("A9").num_liberties);
EXPECT_EQ(7, board.GroupAt("B8").num_liberties);
}
TEST(PositionTest, TestSameFriendlyGroupNeighboringTwice) {
auto board = TestablePosition(R"(
OO
O.)");
board.PlayMove("B8", Color::kWhite);
EXPECT_EQ(CleanBoardString(R"(
OO
OO)"),
board.ToSimpleString());
auto group = board.GroupAt("A9");
EXPECT_EQ(4, group.size);
EXPECT_EQ(4, group.num_liberties);
}
TEST(PositionTest, TestSameOpponentGroupNeighboringTwice) {
auto board = TestablePosition(R"(
OO
O.)");
board.PlayMove("B8", Color::kBlack);
EXPECT_EQ(CleanBoardString(R"(
OO
OX)"),
board.ToSimpleString());
auto white_group = board.GroupAt("A9");
EXPECT_EQ(3, white_group.size);
EXPECT_EQ(2, white_group.num_liberties);
auto black_group = board.GroupAt("B8");
EXPECT_EQ(1, black_group.size);
EXPECT_EQ(2, black_group.num_liberties);
}
TEST(PositionTest, IsMoveSuicidal) {
auto board = TestablePosition(R"(
...O.O...
....O....
XO.....O.
OXO...OXO
O.XO.OX.O
OXOOOOOOX
XOOX.XO..
...OOOXXO
.....XOO.)");
std::vector<std::string> suicidal_moves = {"E9", "H5", "E3"};
for (const auto& c : suicidal_moves) {
EXPECT_TRUE(board.IsMoveSuicidal(c, Color::kBlack));
}
std::vector<std::string> nonsuicidal_moves = {"B5", "J1", "A9"};
for (const auto& c : nonsuicidal_moves) {
EXPECT_FALSE(board.IsMoveSuicidal(c, Color::kBlack));
}
}
// Tests ko tracking.
TEST(PositionTest, TestKoTracking) {
auto board = TestablePosition(R"(
XOXO.....
.........)");
// Capturing a stone in a non-koish coord shouldn't create a ko.
board.PlayMove("B8", Color::kBlack);
EXPECT_EQ(CleanBoardString(R"(
X.XO.....
.X.......)"),
board.ToSimpleString());
// Capturing a stone in a koish coord should create a ko.
board.PlayMove("C8", Color::kWhite);
board.PlayMove("B9", Color::kWhite);
EXPECT_EQ(CleanBoardString(R"(
XO*O.....
.XO......)"),
board.ToSimpleString());
// Playing a move should clear the ko.
board.PlayMove("J9", Color::kBlack);
EXPECT_EQ(CleanBoardString(R"(
XO.O....X
.XO......)"),
board.ToSimpleString());
// Test ko when capturing white as well.
board.PlayMove("C9", Color::kBlack);
EXPECT_EQ(CleanBoardString(R"(
X*XO....X
.XO......)"),
board.ToSimpleString());
// Playing a move should clear the ko.
board.PlayMove("H9", Color::kWhite);
EXPECT_EQ(CleanBoardString(R"(
X.XO...OX
.XO......)"),
board.ToSimpleString());
}
TEST(PositionTest, TestSeki) {
auto board = TestablePosition(R"(
O....XXXX
.....XOOO
.....XOX.
.....XO.X
.....XOOX
......XOO
......XXX)");
// All empty squares are neutral points and black has 5 more stones than
// white.
EXPECT_EQ(5, board.CalculateScore());
}
TEST(PositionTest, TestScoring) {
EXPECT_EQ(0, TestablePosition("").CalculateScore());
EXPECT_EQ(-42, TestablePosition("", 42).CalculateScore());
EXPECT_EQ(kN * kN, TestablePosition("X").CalculateScore());
EXPECT_EQ(-kN * kN, TestablePosition("O").CalculateScore());
{
auto board = TestablePosition(R"(
.X.
X.O)");
EXPECT_EQ(2, board.CalculateScore());
}
{
auto board = TestablePosition(R"(
.XX......
OOXX.....
OOOX...X.
OXX......
OOXXXXXX.
OOOXOXOXX
.O.OOXOOX
.O.O.OOXX
......OOO)",
6.5);
EXPECT_EQ(1.5, board.CalculateScore());
}
{
auto board = TestablePosition(R"(
XXX......
OOXX.....
OOOX...X.
OXX......
OOXXXXXX.
OOOXOXOXX
.O.OOXOOX
.O.O.OOXX
......OOO)",
6.5);
EXPECT_EQ(2.5, board.CalculateScore());
}
}
// Plays through an example game and verifies that the outcome is as expected.
TEST(PositionTest, PlayGame) {
std::vector<std::string> moves = {
"ge", "de", "cg", "ff", "ed", "dd", "ec", "dc", "eg", "df", "dg", "fe",
"gc", "gd", "fd", "hd", "he", "bf", "bg", "fg", "cf", "be", "ce", "cd",
"af", "hc", "hb", "gb", "ic", "bd", "fh", "gh", "fi", "eh", "dh", "di",
"ci", "fc", "id", "ch", "ei", "eb", "gc", "fb", "gg", "gf", "hg", "hf",
"if", "hh", "ig", "ih", "ie", "ha", "ga", "gd", "hd", "fa", "ib", "ae",
"ag", "ee", "gd", "cb", "gi", "ga", "hi", "ia", "ii", "ef", "bh", "db",
"hh", "ba", "ai", "ac", "bi", "da", "di", "ab", "eh", "bc", "gh",
};
TestablePosition board("", kDefaultKomi);
for (const auto& move : moves) {
board.PlayMove(move);
// std::cout << board.ToPrettyString() << std::endl;
}
EXPECT_EQ(CleanBoardString(R"(
.O.O.OOOO
O.OOOOOXX
OO.OXOX.X
.OOOXXXXX
OOXOOOXXX
XOXOOOOOX
XXXXXOXXX
.X.XXXXX.
XXXXXXXXX)"),
board.ToSimpleString());
std::array<int, 2> expected_captures = {10, 2};
EXPECT_EQ(expected_captures, board.num_captures());
EXPECT_EQ(-0.5, board.CalculateScore());
}
} // namespace
} // namespace minigo