Getting Started¶
Prerequisites¶
To use chesscxx, you’ll need:
C++23 compatible compiler (see the Overview for a list of supported compilers)
CMake 3.28+ and a compatible generator (e.g., Ninja, Make, or Visual Studio) — only required if you want to build or install chesscxx with CMake or use it via FetchContent.
Installation¶
chesscxx is a header-only library, meaning no compilation or linking is required.
To use it in your project, simply add the include directory to your compiler’s include path.
For example:
git clone https://github.com/igorqs/chesscxx.git
g++ -I chesscxx/include your_program.cpp -o your_program -std=c++23
Building with CMake¶
If you prefer, you can build and install chesscxx using CMake.
This allows you to install the headers system-wide (e.g., into /usr/local/include/chesscxx-<version>/).
Build¶
For single-configuration generators (like Unix Makefiles):
cmake -S . -B build -D CMAKE_BUILD_TYPE=Release
cmake --build build
For multi-configuration generators (like Visual Studio):
cmake -S . -B build
cmake --build build --config Release
Install¶
After building, install the headers:
For single-configuration generators:
cmake --install build
For multi-configuration generators:
cmake --install build --config Release
CMake package¶
Once installed, other CMake projects (targets) can depend on chesscxx by using the find_package
command of CMake:
Package name: chesscxx
Target name: chesscxx::chesscxx
Example usage:
find_package(chesscxx REQUIRED)
# Declare the imported target as a build requirement using PRIVATE, where
# project_target is a target created in the consuming project
target_link_libraries(
project_target PRIVATE
chesscxx::chesscxx
)
Using with FetchContent¶
If you prefer not to install chesscxx system-wide, you can use CMake’s
FetchContent module
to fetch the library directly from its repository at configure time:
include(FetchContent)
FetchContent_Declare(
chesscxx
GIT_REPOSITORY https://github.com/igorqs/chesscxx.git
GIT_TAG main # <-- or a specific commit/tag for stability
)
FetchContent_MakeAvailable(chesscxx)
target_link_libraries(
project_target PRIVATE
chesscxx::chesscxx
)
Examples¶
Full Game¶
#include <chesscxx/game.h>
#include <chesscxx/parse.h>
#include <chesscxx/san_move.h>
#include <chesscxx/uci_move.h>
#include <cstdlib>
#include <print>
#include <string_view>
namespace {
void verify(const auto& check) {
if (!static_cast<bool>(check)) std::abort();
}
auto parseSanMove(std::string_view str) -> chesscxx::SanMove {
auto parsed_san_move = chesscxx::parse<chesscxx::SanMove>(str);
verify(parsed_san_move);
return parsed_san_move.value();
}
auto parseUciMove(std::string_view str) -> chesscxx::UciMove {
auto parsed_uci_move = chesscxx::parse<chesscxx::UciMove>(str);
verify(parsed_uci_move);
return parsed_uci_move.value();
}
} // namespace
auto main() -> int {
chesscxx::Game game;
verify(game.move(parseSanMove("e4")));
verify(game.move(parseUciMove("g7g5")));
verify(game.move(parseSanMove("Nc3")));
verify(game.move(parseSanMove("f5")));
verify(game.move(parseSanMove("Qh5")));
std::println("{}", game);
}
Output:
[Result "1-0"]
1. e4 g5 2. Nc3 f5 3. Qh5# 1-0
Using the Move Generator¶
#include <chesscxx/game.h>
#include <chesscxx/movegen.h>
#include <chesscxx/parse.h>
#include <cstdlib>
#include <print>
#include <string_view>
namespace {
void verify(const auto& check) {
if (!static_cast<bool>(check)) std::abort();
}
auto parseFen(std::string_view str) -> chesscxx::Game {
auto parsed_game =
chesscxx::parse<chesscxx::Game>(str, chesscxx::parse_as::Fen{});
verify(parsed_game);
return parsed_game.value();
}
void printGame(const auto& game) {
std::println("{:fen}", game);
std::println("{}", chesscxx::legalUciMoves(game));
std::println("{}\n", chesscxx::legalSanMoves(game));
}
} // namespace
auto main() -> int {
chesscxx::Game const game =
parseFen("3r1bnr/kPpppppp/2R5/8/8/8/1PPPPPPP/1NBQKBNR w K - 1 9");
printGame(game);
}
Output:
3r1bnr/kPpppppp/2R5/8/8/8/1PPPPPPP/1NBQKBNR w K - 1 9
[g1h3, g1f3, b1c3, b1a3, c6c5, c6c4, c6c3, c6c7, c6b6, c6a6, c6d6, c6e6, c6f6, c6g6, c6h6, h2h3, h2h4, g2g3, g2g4, f2f3, f2f4, e2e3, e2e4, d2d3, d2d4, c2c3, c2c4, b2b3, b2b4, b7b8n, b7b8b, b7b8r, b7b8q]
[Nh3, Nf3, Nc3, Na3, Rc5, Rc4, Rc3, Rxc7, Rb6, Ra6+, Rd6, Re6, Rf6, Rg6, Rh6, h3, h4, g3, g4, f3, f4, e3, e4, d3, d4, c3, c4, b3, b4, b8=N, b8=B+, b8=R, b8=Q+]
Parsing PGN¶
#include <chesscxx/game.h>
#include <chesscxx/parse.h>
#include <print>
auto main() -> int {
auto parsed_game = chesscxx::parse<chesscxx::Game>(
"[FEN \"7k/8/6KN/8/7B/8/8/8 w - - 0 1\"]\n"
"\n"
"1. Bf6#");
if (parsed_game) {
std::println("{}", parsed_game.value());
} else {
std::println("{}", parsed_game.error());
}
}
Output:
[Result "1-0"]
[FEN "7k/8/6KN/8/7B/8/8/8 w - - 0 1"]
[SetUp "1"]
1. Bf6# 1-0
Parsing games from a file¶
#include <chesscxx/game.h>
#include <chesscxx/parse.h>
#include <algorithm>
#include <cctype>
#include <fstream>
#include <iostream>
#include <iterator>
#include <print>
#include <ranges>
#include <string_view>
#include <vector>
auto main() -> int {
std::ifstream file("data/games.pgn", std::ios::binary);
if (!file) return 1;
std::vector<char> buffer{std::istreambuf_iterator<char>{file},
std::istreambuf_iterator<char>{}};
// trim trailing spaces; otherwise, these spaces might be parsed as a valid
// empty game
auto rit = std::ranges::find_if_not(
std::ranges::reverse_view(buffer),
[](unsigned char character) { return std::isspace(character); });
std::string_view const str(buffer.begin(), rit.base());
for (const auto *it = str.begin(); it != str.end();) {
auto result = chesscxx::parseFrom<chesscxx::Game>(it, str.end());
if (result) {
std::println("{}", result->parsed_value);
} else {
std::println(stderr, "{}", result.error());
return 1;
}
it = result->ptr;
}
return 0;
}
[Result "*"]
1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6 cxd6 6. Nf3 *
[Result "0-1"]
1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6 cxd6 6. Nf3 g6 7. Nc3 Bg7 8. Be2 O-O 9. h3 Bf5 10. Nh4 Bd7 11. Bg5 Nc6 12. Nf3 Bf5 13. a3 Qc8 14. d5 Ne5 15. Bxe7 Nxf3+ 16. gxf3 Re8 17. Bxd6 Nxc4 18. Bg3 Nxb2 19. Qb3 Bxc3+ 20. Kf1 Bxh3+ 21. Rxh3 Qxh3+ 22. Kg1 Be5 23. Bxe5 Rxe5 24. Qxb2 Rg5# 0-1
[Result "*"]
1. b3 Nc6 2. Bb2 b6 3. e3 Bb7 4. Nf3 Nf6 5. d4 d5 6. Nbd2 e6 7. Be2 Bd6 8. O-O h5 9. Ne5 h4 10. Bb5 Bxe5 11. dxe5 Nd7 12. f4 Qe7 13. Bxc6 Bxc6 14. Bd4 O-O-O 15. a4 g5 16. a5 b5 17. Bxa7 Rdg8 18. Bd4 gxf4 19. exf4 Rg7 20. a6 Rhg8 21. Rf2 Nb6 22. a7 Ba8 23. Qe2 Rg4 24. Qxb5 *
[Result "0-1"]
1. d4 Nf6 2. Nf3 d5 3. Nbd2 c5 4. e3 Nc6 5. c3 cxd4 6. exd4 Bf5 7. Qb3 Qc7 8. Nh4 Bg4 9. Bd3 e5 10. h3 Be6 11. dxe5 Qxe5+ 12. Kd1 O-O-O 13. Nhf3 Qh5 14. Re1 Ne4 15. Re2 Bc5 16. Kc2 Nxf2 17. Qb5 Nxd3 18. Rxe6 fxe6 19. Qxd3 Qf5 20. Qxf5 exf5 21. Nb3 Bb6 22. Bg5 Rd7 23. a4 h6 24. Bd2 Na5 25. Nbd4 Bxd4 26. Nxd4 Rf8 27. b3 a6 28. h4 Re7 29. g3 Nc6 30. Kd3 Nxd4 31. cxd4 Kd7 32. Bb4 Rc8 33. Bxe7 Kxe7 34. Re1+ Kf6 35. Re5 Rd8 36. Ke3 g5 37. h5 Rd6 38. Kd3 Rb6 39. Kc3 Rc6+ 40. Kd3 a5 41. Rxd5 b6 42. Rd8 Ke7 43. Rg8 Rd6 44. Rg6 Rxg6 45. hxg6 Kf6 46. d5 Kxg6 47. d6 Kf7 48. Kd4 Ke6 49. d7 Kxd7 50. Ke5 f4 51. gxf4 gxf4 52. Kxf4 Kd6 53. Kf5 Kc5 54. Kg6 Kb4 55. Kxh6 Kxb3 56. Kg5 Kxa4 57. Kf4 Kb3 58. Ke3 a4 59. Kd4 a3 60. Kd5 a2 61. Kc6 a1=Q 62. Kxb6 Qc3 63. Kb5 Kc2 64. Kb6 Kd3 65. Kb5 Kd4 66. Kb6 Kd5 67. Kb5 Kd6 68. Kb6 Qb3+ 69. Ka6 Kc6 70. Ka7 Kc7 71. Ka6 Qa4# 0-1
[Result "1/2-1/2"]
1. e4 Nf6 2. Nc3 d5 3. exd5 Nxd5 4. Nxd5 Qxd5 5. Qf3 c6 6. Qxd5 cxd5 7. g3 Bf5 8. d3 e5 9. Bg2 e4 10. dxe4 Bxe4 11. Bxe4 dxe4 12. Bd2 Nc6 13. Bc3 Bb4 14. Ne2 O-O-O 15. Rd1 Rxd1+ 16. Kxd1 Rd8+ 17. Kc1 g6 18. Rd1 Rxd1+ 19. Kxd1 f5 20. Bf6 Kd7 21. c3 Bc5 22. Ke1 Ke6 23. Bg5 Ne5 24. Nf4+ Kd6 25. Ke2 Nf3 26. h4 Nxg5 27. hxg5 Ke5 28. b4 Be7 29. Nh3 Kd5 30. Kd2 Kc4 31. Kc2 b5 32. Kd2 Bf8 33. Ng1 h6 34. gxh6 Bxh6+ 35. Kc2 e3 36. fxe3 Bxe3 37. Nf3 g5 38. g4 fxg4 39. Ne5+ Kd5 40. Nxg4 Bf4 41. Kd3 a6 42. Nf2 Bg3 43. Ne4 Bf4 44. Nc5 g4 45. Nxa6 g3 46. Ke2 Kc4 47. Kf3 Bd6 48. a3 Kxc3 49. Nc5 Kc4 50. Ne4 Bc7 51. Nc5 Bd6 52. Ne4 Be5 53. Nc5 Bb2 54. a4 Kxb4 55. axb5 Kxc5 56. Kxg3 Kxb5 1/2-1/2
[Result "1/2-1/2"]
1. e4 Nf6 2. d3 d5 3. Nc3 dxe4 4. Nxe4 Nxe4 5. dxe4 e5 6. Qxd8+ Kxd8 7. Bc4 f6 8. Be3 c5 9. O-O-O Kc7 10. f4 Nc6 11. Nf3 Bg4 12. c3 Bd6 13. f5 Rad8 14. h3 Bh5 15. g4 Be8 16. Rd2 Na5 17. Be2 Bc6 18. Bd3 c4 19. Bc2 b6 20. Rg1 Nb7 21. g5 Be7 22. gxf6 Bxf6 23. Rxd8 Rxd8 24. Ng5 Bxg5 25. Bxg5 Rd7 26. f6 g6 27. Rf1 Rf7 28. Bh4 Nc5 29. Re1 h6 30. b4 Nd3+ 31. Bxd3 cxd3 32. c4 g5 33. Bg3 Kd6 34. Kd2 Rxf6 35. Kxd3 Rf3+ 36. Re3 Rxe3+ 37. Kxe3 Bd7 38. h4 g4 39. a3 h5 40. Kd3 Bc6 41. Bf2 a6 42. Bxb6 Bb7 43. Bf2 Kc6 44. c5 Kd7 45. Bg3 Ke6 46. Bf2 Bc6 47. Be3 g3 48. Bg1 g2 49. Ke3 Bb7 50. Kf3 Bc6 51. Be3 Bb7 52. Kxg2 Bxe4+ 53. Kf2 Bc6 54. Bg5 Kf5 55. Ke3 Kg4 56. Bf6 Kf5 57. Bd8 Kg4 58. Be7 Kf5 59. Bd6 Ke6 60. Kd3 Kd5 61. Kc3 Ba4 62. Bc7 e4 63. Bf4 Bd1 64. Be3 Ba4 65. Bf4 Bd1 66. Bg5 Ba4 67. Be3 Bd1 68. Bf4 Ba4 69. Bg5 Bd1 70. Bh6 Ba4 71. Kd2 Bb5 72. Be3 Ba4 73. Bf4 Bb5 74. Kc3 Ba4 75. Be3 Bd1 76. Bf4 Ba4 77. Kd2 Bb5 78. Kc3 Ba4 1/2-1/2
[Result "1/2-1/2"]
1. b3 Nf6 2. Bb2 g6 3. e3 Bg7 4. Nf3 O-O 5. g3 c6 6. Bg2 d5 7. O-O Be6 8. Nc3 Nbd7 9. d4 Nb6 10. Qe2 a5 11. a3 a4 12. b4 Nc4 13. Bc1 b5 14. Nd2 Qc8 15. Nxc4 dxc4 16. Ne4 Nxe4 17. Bxe4 Bd5 18. Qf3 e6 19. c3 f5 20. Bxd5 cxd5 21. Qf4 Qb8 22. h4 Qxf4 23. exf4 Rfe8 24. Re1 Re7 25. Bd2 Rae8 26. Re2 Kf7 27. Rae1 h5 28. Kg2 Bf6 29. Kh3 Rg8 30. f3 Rge8 31. Kg2 Rg8 32. Kh3 Rge8 33. Kh2 Rg8 34. Kg1 Rge8 35. Kf1 Rg8 36. Kf2 Rge8 37. Bc1 Ra7 38. Bb2 Rae7 39. Ba1 Ra7 40. Bb2 Ra6 41. Bc1 Rd6 42. Kg2 Ke7 43. Re3 Kd7 44. Kh3 Kc6 45. Kh2 Re7 46. Kh1 Kc7 47. Kg1 Kd7 48. Kf1 Ra6 49. Kf2 Ra8 50. Kg2 Rae8 51. Kh2 Kd6 52. Kh1 Bg7 53. R1e2 Bh6 54. Kg2 Kd7 55. Re1 Kd6 56. R1e2 Kd7 57. Kh2 Kd6 58. Kh1 Bg7 59. Kg1 Bh6 60. Kf1 Kd7 61. Kf2 Kd6 62. Re1 Kd7 63. R3e2 Kd6 64. Ra2 Ra8 65. Rb2 Rae8 66. Rc2 Kd7 67. Rce2 Kd6 68. Ra2 Bg7 69. Kg2 Bf6 70. Kh2 Kd7 71. Kh1 Kd6 72. Kg1 Kd7 73. Kf1 Kd6 74. Kf2 Kd7 75. Kg2 Kd6 76. Rae2 Kd7 77. Kh3 Kd6 78. Rg1 Kd7 79. Rgg2 Kd6 80. Re1 1/2-1/2
[Result "1/2-1/2"]
1. b3 d6 2. Bb2 e5 3. e3 Nd7 4. d4 c6 5. Nd2 Ngf6 6. dxe5 dxe5 7. Ngf3 Qc7 8. Bc4 Be7 9. O-O O-O 10. Bd3 Re8 11. Ne4 Bf8 12. Nxf6+ Nxf6 13. e4 b5 14. c4 a6 15. cxb5 axb5 16. Rc1 Qd6 17. Qe2 Bg4 18. Rfd1 Qe6 19. h3 Bxf3 20. Qxf3 Rxa2 21. Ba1 Rea8 22. Qg3 Nh5 23. Qg5 Nf4 24. Bf1 f6 25. Qf5 Qxb3 26. Bxe5 fxe5 27. Qxe5 Ng6 28. Qg3 Qe6 29. Rd6 Qe5 30. Rdxc6 Qxg3 31. fxg3 Ra1 32. Bxb5 Rxc1+ 33. Rxc1 Ne5 34. Kf2 Nd3+ 35. Bxd3 Rd8 36. Bc4+ Kh8 37. Bd5 h6 38. Kf3 Kh7 39. Kf4 g5+ 40. Kf5 Bg7 41. Rc7 Rf8+ 42. Ke6 Rf2 43. Rd7 Rxg2 44. Ke7 Rxg3 45. Kf7 Rxh3 46. Be6 Rf3+ 47. Bf5+ Rxf5+ 48. exf5 Kh8 49. Kg6 g4 50. Rxg7 g3 51. Kxh6 g2 52. Rxg2 1/2-1/2
[Result "1/2-1/2"]
[FEN "8/2k5/8/4K3/3NB3/8/8/8 w - - 0 1"]
[SetUp "1"]
1. Kd5 Kd7 2. Nb5 Ke7 3. Ke5 Kf7 4. Nc7 Kg7 5. Kf5 Kf7 6. Nd5 Kg8 7. Kg6 Kh8 8. Bf5 Kg8 9. Nf4 Kf8 10. Kf6 Ke8 11. Ke6 Kf8 12. Nh5 Ke8 13. Bg6+ Kf8 14. Kf6 Kg8 15. Ng7 Kh8 16. Bf5 Kg8 17. Kg6 Kf8 18. Kf6 Kg8 19. Bg4 Kf8 20. Bh5 Kg8 21. Nf5 Kf8 22. Nh6 1/2-1/2
e4 Nf6 e5 Nd5 d4 d6 c4 Nb6 exd6 cxd6 Nf3 *
[Date "2025.02.24"]
[Result "0-1"]
[UTCDate "2025.02.24"]
[UTCTime "13:56:24"]
[WhiteElo "2189"]
[BlackElo "2006"]
[WhiteRatingDiff "-71"]
[BlackRatingDiff "+8"]
[Variant "Standard"]
[TimeControl "1200+0"]
[Termination "Normal"]
1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. exd6 cxd6 6. Nf3 g6 7. Nc3 Bg7 8. Be2 O-O 9. h3 Bf5 10. Nh4 Bd7 11. Bg5 Nc6 12. Nf3 Bf5 13. a3 Qc8 14. d5 Ne5 15. Bxe7 Nxf3+ 16. gxf3 Re8 17. Bxd6 Nxc4 18. Bg3 Nxb2 19. Qb3 Bxc3+ 20. Kf1 Bxh3+ 21. Rxh3 Qxh3+ 22. Kg1 Be5 23. Bxe5 Rxe5 24. Qxb2 Rg5 0-1
1. b3 { A01 Nimzo-Larsen Attack } Nc6 2. Bb2 b6 3. e3 Bb7 4. Nf3 Nf6 5. d4 d5 6. Nbd2 e6 7. Be2 Bd6 8. O-O h5?! { Inaccuracy. O-O was best. } (8... O-O 9. c4) 9. Ne5 h4 10. Bb5 Bxe5 11. dxe5 Nd7 12. f4 Qe7?! { Inaccuracy. h3 was best. } (12... h3) 13. Bxc6 Bxc6 14. Bd4? { Mistake. h3 was best. } (14. h3) 14... O-O-O?! { Inaccuracy. h3 was best. } (14... h3) 15. a4 g5 16. a5 b5?! { Inaccuracy. Bb7 was best. } (16... Bb7) 17. Bxa7 Rdg8? { Mistake. gxf4 was best. } (17... gxf4) 18. Bd4 gxf4 19. exf4 Rg7 20. a6 Rhg8 21. Rf2 Nb6?! { Inaccuracy. Ba8 was best. } (21... Ba8) 22. a7?! { Inaccuracy. Nf3 was best. } (22. Nf3 Nd7 23. Qd2 Ba8 24. b4 f6 25. exf6 Nxf6 26. Bxf6 Qxf6 27. Qd4 Rf7) 22... Ba8?! { Inaccuracy. Kb7 was best. } (22... Kb7 23. Nf3 Ka8 24. c3 Bb7 25. b4 Qe8 26. Qf1 Nc4 27. Qe2 Qc6 28. Ng5) 23. Qe2 Rg4 24. Qxb5 { Black resigns. } 1-0
1. d4 Nf6 2. Nf3 d5 3. Nbd2 c5 4. e3 Nc6 5. c3 cxd4 6. exd4 Bf5 7. Qb3 Qc7 8. Nh4 Bg4 9. Bd3 e5 10. h3 Be6 11. dxe5 Qxe5+ 12. Kd1 O-O-O 13. Nhf3 Qh5 14. Re1 Ne4 15. Re2 Bc5 16. Kc2 Nxf2 17. Qb5 Nxd3 18. Rxe6 fxe6 19. Qxd3 Qf5 20. Qxf5 exf5 21. Nb3 Bb6 22. Bg5 Rd7 23. a4 h6 24. Bd2 Na5 25. Nbd4 Bxd4 26. Nxd4 Rf8 27. b3 a6 28. h4 Re7 29. g3 Nc6 30. Kd3 Nxd4 31. cxd4 Kd7 32. Bb4 Rc8 33. Bxe7 Kxe7 34. Re1+ Kf6 35. Re5 Rd8 36. Ke3 g5 37. h5 Rd6 38. Kd3 Rb6 39. Kc3 Rc6+ 40. Kd3 a5 41. Rxd5 b6 42. Rd8 Ke7 43. Rg8 Rd6 44. Rg6 Rxg6 45. hxg6 Kf6 46. d5 Kxg6 47. d6 Kf7 48. Kd4 Ke6 49. d7 Kxd7 50. Ke5 f4 51. gxf4 gxf4 52. Kxf4 Kd6 53. Kf5 Kc5 54. Kg6 Kb4 55. Kxh6 Kxb3 56. Kg5 Kxa4 57. Kf4 Kb3 58. Ke3 a4 59. Kd4 a3 60. Kd5 a2 61. Kc6 a1=Q 62. Kxb6 Qc3 63. Kb5 Kc2 64. Kb6 Kd3 65. Kb5 Kd4 66. Kb6 Kd5 67. Kb5 Kd6 68. Kb6 Qb3+ 69. Ka6 Kc6 70. Ka7 Kc7 71. Ka6 Qa4# 0-1
1. e4 Nf6 2. Nc3 d5 3. exd5 Nxd5 4. Nxd5 Qxd5 5. Qf3 c6 6. Qxd5 cxd5 7. g3 Bf5 8. d3 e5 9. Bg2 e4 10. dxe4 Bxe4 11. Bxe4 dxe4 12. Bd2 Nc6 13. Bc3 Bb4 14. Ne2 O-O-O 15. Rd1 Rxd1+ 16. Kxd1 Rd8+ 17. Kc1 g6 18. Rd1 Rxd1+ 19. Kxd1 f5 20. Bf6 Kd7 21. c3 Bc5 22. Ke1 Ke6 23. Bg5 Ne5 24. Nf4+ Kd6 25. Ke2 Nf3 26. h4 Nxg5 27. hxg5 Ke5 28. b4 Be7 29. Nh3 Kd5 30. Kd2 Kc4 31. Kc2 b5 32. Kd2 Bf8 33. Ng1 h6 34. gxh6 Bxh6+ 35. Kc2 e3 36. fxe3 Bxe3 37. Nf3 g5 38. g4 fxg4 39. Ne5+ Kd5 40. Nxg4 Bf4 41. Kd3 a6 42. Nf2 Bg3 43. Ne4 Bf4 44. Nc5 g4 45. Nxa6 g3 46. Ke2 Kc4 47. Kf3 Bd6 48. a3 Kxc3 49. Nc5 Kc4 50. Ne4 Bc7 51. Nc5 Bd6 52. Ne4 Be5 53. Nc5 Bb2 54. a4 Kxb4 55. axb5 Kxc5 56. Kxg3 Kxb5 1/2-1/2
1. e4 Nf6 2. d3 d5 3. Nc3 dxe4 4. Nxe4 Nxe4 5. dxe4 e5 6. Qxd8+ Kxd8
7. Bc4 f6 8. Be3 c5 9. O-O-O+ Kc7 10. f4 Nc6 11. Nf3 Bg4 12. c3 Bd6 13. f5 Rad8
14. h3 Bh5 15. g4 Be8 16. Rd2 Na5 17. Be2 Bc6 18. Bd3 c4 19. Bc2 b6 20. Rg1 Nb7
21. g5 Be7 22. gxf6 Bxf6 23. Rxd8 Rxd8 24. Ng5 Bxg5 25. Bxg5 Rd7 26. f6 g6
27. Rf1 Rf7 28. Bh4 Nc5 29. Re1 h6 30. b4 Nd3+ 31. Bxd3 cxd3 32. c4 g5
33. Bg3 Kd6 34. Kd2 Rxf6 35. Kxd3 Rf3+ 36. Re3 Rxe3+ 37. Kxe3 Bd7 38. h4 g4
39. a3 h5 40. Kd3 Bc6 41. Bf2 a6 42. Bxb6 Bb7 43. Bf2 Kc6 44. c5 Kd7
45. Bg3 Ke6 46. Bf2 Bc6 47. Be3 g3 48. Bg1 g2 49. Ke3 Bb7 50. Kf3 Bc6
51. Be3 Bb7 52. Kxg2 Bxe4+ 53. Kf2 Bc6 54. Bg5 Kf5 55. Ke3 Kg4 56. Bf6 Kf5
57. Bd8 Kg4 58. Be7 Kf5 59. Bd6 Ke6 60. Kd3 Kd5 61. Kc3 Ba4 62. Bc7 e4
63. Bf4 Bd1 64. Be3 Ba4 65. Bf4 Bd1 66. Bg5 Ba4 67. Be3 Bd1 68. Bf4 Ba4
69. Bg5 Bd1 70. Bh6 Ba4 71. Kd2 Bb5 72. Be3 Ba4 73. Bf4 Bb5 74. Kc3 Ba4
75. Be3 Bd1 76. Bf4 Ba4 77. Kd2 Bb5 78. Kc3 Ba4 1/2-1/2
1. b3 Nf6 2. Bb2 g6 3. e3 Bg7 4. Nf3 O-O 5. g3 c6 6. Bg2 d5 7. O-O Be6 8. Nc3 Nbd7 9. d4 Nb6 10. Qe2 a5 11. a3 a4 12. b4 Nc4 13. Bc1 b5 14. Nd2 Qc8 15. Nxc4 dxc4 16. Ne4 Nxe4 17. Bxe4 Bd5 18. Qf3 e6 19. c3 f5 20. Bxd5 cxd5 21. Qf4 Qb8 22. h4 Qxf4 23. exf4 Rfe8 24. Re1 Re7 25. Bd2 Rae8 26. Re2 Kf7 27. Rae1 h5 28. Kg2 Bf6 29. Kh3 Rg8 30. f3 Rge8 31. Kg2 Rg8 32. Kh3 Rge8 33. Kh2 Rg8 34. Kg1 Rge8 35. Kf1 Rg8 36. Kf2 Rge8 37. Bc1 Ra7 38. Bb2 Rae7 39. Ba1 Ra7 40. Bb2 Ra6 41. Bc1 Rd6 42. Kg2 Ke7 43. Re3 Kd7 44. Kh3 Kc6 45. Kh2 Re7 46. Kh1 Kc7 47. Kg1 Kd7 48. Kf1 Ra6 49. Kf2 Ra8 50. Kg2 Rae8 51. Kh2 Kd6 52. Kh1 Bg7 53. R1e2 Bh6 54. Kg2 Kd7 55. Re1 Kd6 56. R1e2 Kd7 57. Kh2 Kd6 58. Kh1 Bg7 59. Kg1 Bh6 60. Kf1 Kd7 61. Kf2 Kd6 62. Re1 Kd7 63. R3e2 Kd6 64. Ra2 Ra8 65. Rb2 Rae8 66. Rc2 Kd7 67. Rce2 Kd6 68. Ra2 Bg7 69. Kg2 Bf6 70. Kh2 Kd7 71. Kh1 Kd6 72. Kg1 Kd7 73. Kf1 Kd6 74. Kf2 Kd7 75. Kg2 Kd6 76. Rae2 Kd7 77. Kh3 Kd6 78. Rg1 Kd7 79. Rgg2 Kd6 80. Re1 1/2-1/2
1. b3 d6 2. Bb2 e5 3. e3 Nd7 4. d4 c6 5. Nd2 Ngf6 6. dxe5 dxe5 7. Ngf3 Qc7 8. Bc4 Be7 9. O-O O-O 10. Bd3 Re8 11. Ne4 Bf8 12. Nxf6+ Nxf6 13. e4 b5 14. c4 a6 15. cxb5 axb5 16. Rc1 Qd6 17. Qe2 Bg4 18. Rfd1 Qe6 19. h3 Bxf3 20. Qxf3 Rxa2 21. Ba1 Rea8 22. Qg3 Nh5 23. Qg5 Nf4 24. Bf1 f6 25. Qf5 Qxb3 26. Bxe5 fxe5 27. Qxe5 Ng6 28. Qg3 Qe6 29. Rd6 Qe5 30. Rdxc6 Qxg3 31. fxg3 Ra1 32. Bxb5 Rxc1+ 33. Rxc1 Ne5 34. Kf2 Nd3+ 35. Bxd3 Rd8 36. Bc4+ Kh8 37. Bd5 h6 38. Kf3 Kh7 39. Kf4 g5+ 40. Kf5 Bg7 41. Rc7 Rf8+ 42. Ke6 Rf2 43. Rd7 Rxg2 44. Ke7 Rxg3 45. Kf7 Rxh3 46. Be6 Rf3+ 47. Bf5+ Rxf5+ 48. exf5 Kh8 49. Kg6 g4 50. Rxg7 g3 51. Kxh6 g2 52. Rxg2 1/2-1/2
[FEN "8/2k5/8/4K3/3NB3/8/8/8 w - - 0 1"]
[SetUp "1"]
1. Kd5 Kd7 2. Nb5 Ke7 3. Ke5 Kf7 4. Nc7 Kg7 5. Kf5 Kf7 6. Nd5 Kg8 7. Kg6 Kh8 8. Bf5 Kg8 9. Nf4 Kf8 10. Kf6 Ke8 11. Ke6 Kf8 12. Nh5 Ke8 13. Bg6+ Kf8 14. Kf6 Kg8 15. Ng7 Kh8 16. Bf5 Kg8 17. Kg6 Kf8 18. Kf6 Kg8 19. Bg4 Kf8 20. Bh5 Kg8 21. Nf5 Kf8 22. Nh6 1/2-1/2