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0.1.1	~~May 26, 2024~~

#86 in Value formatting

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MIT license

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rschess

A Rust chess library with the aim to be as feature-rich as possible

Aim
Features
Examples
History

Aim

This project aims to be as feature-rich as possible, at the cost of performance (this may change in the future). There are surprisingly very few Rust crates that offer enough features for use in applications related to chess. With rschess I strive to create a library that offers all the necessary functionalities for the development of chess software.

Features

Parsing FEN

use rschess::{Board, Fen};

let board = Board::from_fen(Fen::try_from("2R5/4bppk/1p1p3Q/5R1P/4P3/5P2/r4q1P/7K b - - 6 50").unwrap());
let starting_position = Board::default(); // equivalent to Board::from_fen("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1".try_into().unwrap())

Parsing PGN

To use PGN, you must first enable the pgn feature in Cargo.toml:

[dependencies]
rschess = { git = "https://github.com/prawnydagrate/rschess.git", features = ["pgn"] }

Carlsen-Karjakin_WCC2016_R13_4.pgn

[Event "Carlsen - Karjakin World Championship Match"]
[Site "New York, NY USA"]
[Date "2016.11.30"]
[EventDate "2016.11.11"]
[Round "13.4"]
[Result "1-0"]
[White "Magnus Carlsen"]
[Black "Sergey Karjakin"]
[ECO "B54"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "99"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3 e5 6.Nb3 Be7 7.c4
a5 8.Be3 a4 9.Nc1 O-O 10.Nc3 Qa5 11.Qd2 Na6 12.Be2 Nc5 13.O-O
Bd7 14.Rb1 Rfc8 15.b4 axb3 16.axb3 Qd8 17.Nd3 Ne6 18.Nb4 Bc6
19.Rfd1 h5 20.Bf1 h4 21.Qf2 Nd7 22.g3 Ra3 23.Bh3 Rca8 24.Nc2
R3a6 25.Nb4 Ra5 26.Nc2 b6 27.Rd2 Qc7 28.Rbd1 Bf8 29.gxh4 Nf4
30.Bxf4 exf4 31.Bxd7 Qxd7 32.Nb4 Ra3 33.Nxc6 Qxc6 34.Nb5 Rxb3
35.Nd4 Qxc4 36.Nxb3 Qxb3 37.Qe2 Be7 38.Kg2 Qe6 39.h5 Ra3
40.Rd3 Ra2 41.R3d2 Ra3 42.Rd3 Ra7 43.Rd5 Rc7 44.Qd2 Qf6 45.Rf5
Qh4 46.Rc1 Ra7 47.Qxf4 Ra2+ 48.Kh1 Qf2 49.Rc8+ Kh7 50.Qh6+ 1-0

Source: Chessgames.com

use rschess::{Board, pgn::Pgn};

let pgn = Pgn::try_from(include_str!("Carlsen-Karjakin_WCC2016_R13_4.pgn")).unwrap();
let board = pgn.board(); // &Board
assert_eq!(Board::from_fen("2R5/4bppk/1p1p3Q/5R1P/4P3/5P2/r4q1P/7K b - - 6 50".try_into().unwrap()).position(), board.position());

In the above example, the two Boards are not equal but their Positions are, because Pgn recognizes using the '1-0' in the text that white has won by resignation, whereas Fen does not (because FEN text does not contain information about the game result).

Generating legal moves

use rschess::Board;

let board = Board::from_fen("2R5/4bppk/1p1p3Q/5R1P/4P3/5P2/r4q1P/7K b - - 6 50".try_into().unwrap());
let legal_moves = board.gen_legal_moves();
assert_eq!(legal_moves.len(), 2);

Note that there are no legal moves when a game is over.

Making moves

use rschess::{Board, Move};

let mut board = Board::default();

// move from UCI
board.make_move(Move::from_uci("e2e4").unwrap()).unwrap();
// or shortened:
board.make_move_uci("c7c5").unwrap();

// move from SAN
board.make_move(board.san_to_move("Nc3").unwrap()).unwrap();
// or shortened:
board.make_move_san("Nc6").unwrap();

// print all legal moves in UCI
println!("{:?}", board.gen_legal_moves().iter().map(Move::to_uci).collect::<Vec<_>>());

// print all legal moves in SAN
println!("{:?}", board.gen_legal_moves().into_iter().map(|m| board.move_to_san(m).unwrap()).collect::<Vec<_>>());

Output

["a1b1", "d1e2", "d1f3", "d1g4", "d1h5", "e1e2", "f1e2", "f1d3", "f1c4", "f1b5", "f1a6", "g1e2", "g1f3", "g1h3", "a2a3", "a2a4", "b2b3", "b2b4", "d2d3", "d2d4", "f2f3", "f2f4", "g2g3", "g2g4", "h2h3", "h2h4", "c3a4", "c3b5", "c3d5", "c3e2", "c3b1", "e4e5"]
["Rb1", "Qe2", "Qf3", "Qg4", "Qh5", "Ke2", "Be2", "Bd3", "Bc4", "Bb5", "Ba6", "Nge2", "Nf3", "Nh3", "a3", "a4", "b3", "b4", "d3", "d4", "f3", "f4", "g3", "g4", "h3", "h4", "Na4", "Nb5", "Nd5", "Nce2", "Nb1", "e5"]

Board status

use rschess::{Board, Color, GameResult, WinType};

let start_pos = Board::default();
assert!(start_pos.is_ongoing());
assert_eq!(start_pos.stalemated_side(), None);
assert_eq!(start_pos.game_result(), None);

let mut board = Board::from_fen("2R5/4bppk/1p1p3Q/5R1P/4P3/5P2/r4q1P/7K b - - 6 50".try_into().unwrap());
board.make_moves_san("gxh6 Rxf7#").unwrap();
assert!(board.is_game_over());
assert!(board.is_checkmate());
assert_eq!(board.checkmated_side(), Some(Color::Black));
assert_eq!(board.game_result(), Some(GameResult::Wins(Color::White, WinType::Checkmate)));

rschess detects:

checkmate
stalemate
threefold repetition
insufficient checkmating material
the fifty-move rule
fivefold repetition
and the seventy-five-move rule.

Note that threefold repetition and the fifty-move rule do not immediately end the game, as these are types of draws that must be claimed by a player.

Generating FEN

use rschess::Board;

let board = Board::default();
let fen = board.to_fen(); // returns a Fen object
assert_eq!(fen.to_string(), "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1");

Generating PGN

Here too, to use PGN, you must first enable the pgn feature in Cargo.toml:

[dependencies]
rschess = { git = "https://github.com/prawnydagrate/rschess.git", features = ["pgn"] }

From PGN text

M290-study.pgn

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "bBrb1B2/P1n1r2p/1Kp1Pb1p/2pk1P1p/5P2/1P2pP2/1pP1P3/1R4n1 w - - 0 1"]

1. Rd1+ Bd4 2. c4+ Kd6 3. Rxg1 Bc3 4. Rd1+ Bd4 5. Ka5 Bb7 6. Ka4 Ba8 7. Ka3 Bb7
8. Ka2 Ba8 9. Kb1 Bb7 10. Kc2 Ba8 11. Kd3 Bb7 12. Re1 Ba8 13. Rf1 Bb7 14. Rd1
Ba8 15. Kc2 Bb7 16. Kb1 Ba8 17. Ka2 Bb7 18. Ka3 Ba8 19. Ka4 Bb7 20. Ka5 Ba8 21.
Kb6 h4 22. Ka5 Bb7 23. Ka4 Ba8 24. Ka3 Bb7 25. Ka2 Ba8 26. Kb1 Bb7 27. Kc2 Ba8
28. Kd3 Bb7 29. Rf1 Ba8 30. Re1 Bb7 31. Rd1 Ba8 32. Kc2 Bb7 33. Kb1 Ba8 34. Ka2
Bb7 35. Ka3 Ba8 36. Ka4 Bb7 37. Ka5 Ba8 38. Kb6 h3 39. Ka5 Bb7 40. Ka4 Ba8 41.
Ka3 Bb7 42. Ka2 Ba8 43. Kb1 Bb7 44. Kc2 Ba8 45. Kd3 Bb7 46. Rf1 Ba8 47. Re1 Bb7
48. Rd1 Ba8 49. Kc2 Bb7 50. Kb1 Ba8 51. Ka2 Bb7 52. Ka3 Ba8 53. Ka4 Bb7 54. Ka5
Ba8 55. Kb6 h2 56. Ka5 Bb7 57. Ka4 Ba8 58. Ka3 Bb7 59. Ka2 Ba8 60. Kb1 Bb7 61.
Kc2 Ba8 62. Kd3 Bb7 63. Rf1 Ba8 64. Re1 Bb7 65. Rd1 Ba8 66. Kc2 Bb7 67. Kb1 Ba8
68. Ka2 Bb7 69. Ka3 Ba8 70. Ka4 Bb7 71. Ka5 Ba8 72. Kb6 h5 73. Ka5 Bb7 74. Ka4
Ba8 75. Ka3 Bb7 76. Ka2 Ba8 77. Kb1 Bb7 78. Kc2 Ba8 79. Kd3 Bb7 80. Rf1 Ba8 81.
Re1 Bb7 82. Rd1 Ba8 83. Kc2 Bb7 84. Kb1 Ba8 85. Ka2 Bb7 86. Ka3 Ba8 87. Ka4 Bb7
88. Ka5 Ba8 89. Kb6 h4 90. Ka5 Bb7 91. Ka4 Ba8 92. Ka3 Bb7 93. Ka2 Ba8 94. Kb1
Bb7 95. Kc2 Ba8 96. Kd3 Bb7 97. Rf1 Ba8 98. Re1 Bb7 99. Rd1 Ba8 100. Kc2 Bb7
101. Kb1 Ba8 102. Ka2 Bb7 103. Ka3 Ba8 104. Ka4 Bb7 105. Ka5 Ba8 106. Kb6 h3
107. Ka5 Bb7 108. Ka4 Ba8 109. Ka3 Bb7 110. Ka2 Ba8 111. Kb1 Bb7 112. Kc2 Ba8
113. Kd3 Bb7 114. Rf1 Ba8 115. Re1 Bb7 116. Rd1 Ba8 117. Kc2 Bb7 118. Kb1 Ba8
119. Ka2 Bb7 120. Ka3 Ba8 121. Ka4 Bb7 122. Ka5 Ba8 123. Kb6 h6 124. Ka5 Bb7
125. Ka4 Ba8 126. Ka3 Bb7 127. Ka2 Ba8 128. Kb1 Bb7 129. Kc2 Ba8 130. Kd3 Bb7
131. Rf1 Ba8 132. Re1 Bb7 133. Rd1 Ba8 134. Kc2 Bb7 135. Kb1 Ba8 136. Ka2 Bb7
137. Ka3 Ba8 138. Ka4 Bb7 139. Ka5 Ba8 140. Kb6 h5 141. Ka5 Bb7 142. Ka4 Ba8
143. Ka3 Bb7 144. Ka2 Ba8 145. Kb1 Bb7 146. Kc2 Ba8 147. Kd3 Bb7 148. Rf1 Ba8
149. Re1 Bb7 150. Rd1 Ba8 151. Kc2 Bb7 152. Kb1 Ba8 153. Ka2 Bb7 154. Ka3 Ba8
155. Ka4 Bb7 156. Ka5 Ba8 157. Kb6 h4 158. Ka5 Bb7 159. Ka4 Ba8 160. Ka3 Bb7
161. Ka2 Ba8 162. Kb1 Bb7 163. Kc2 Ba8 164. Kd3 Bb7 165. Rf1 Ba8 166. Re1 Bb7
167. Rd1 Ba8 168. Kc2 Bb7 169. Kb1 Ba8 170. Ka2 Bb7 171. Ka3 Ba8 172. Ka4 Bb7
173. Ka5 Ba8 174. Kb6 h1=Q 175. Rxh1 Bg7 176. Rd1+ Bd4 177. Ka5 Bb7 178. Ka4 Ba8
179. Ka3 Bb7 180. Ka2 Ba8 181. Kb1 Bb7 182. Kc2 Ba8 183. Kd3 Bb7 184. Rf1 Ba8
185. Re1 Bb7 186. Rd1 Ba8 187. Kc2 Bb7 188. Kb1 Ba8 189. Ka2 Bb7 190. Ka3 Ba8
191. Ka4 Bb7 192. Ka5 Ba8 193. Kb6 h2 194. Ka5 Bb7 195. Ka4 Ba8 196. Ka3 Bb7
197. Ka2 Ba8 198. Kb1 Bb7 199. Kc2 Ba8 200. Kd3 Bb7 201. Rf1 Ba8 202. Re1 Bb7
203. Rd1 Ba8 204. Kc2 Bb7 205. Kb1 Ba8 206. Ka2 Bb7 207. Ka3 Ba8 208. Ka4 Bb7
209. Ka5 Ba8 210. Kb6 h3 211. Ka5 Bb7 212. Ka4 Ba8 213. Ka3 Bb7 214. Ka2 Ba8
215. Kb1 Bb7 216. Kc2 Ba8 217. Kd3 Bb7 218. Rf1 Ba8 219. Re1 Bb7 220. Rd1 Ba8
221. Kc2 Bb7 222. Kb1 Ba8 223. Ka2 Bb7 224. Ka3 Ba8 225. Ka4 Bb7 226. Ka5 Ba8
227. Kb6 h1=Q 228. Rxh1 Bg7 229. Rd1+ Bd4 230. Ka5 Bb7 231. Ka4 Ba8 232. Ka3 Bb7
233. Ka2 Ba8 234. Kb1 Bb7 235. Kc2 Ba8 236. Kd3 Bb7 237. Rf1 Ba8 238. Re1 Bb7
239. Rd1 Ba8 240. Kc2 Bb7 241. Kb1 Ba8 242. Ka2 Bb7 243. Ka3 Ba8 244. Ka4 Bb7
245. Ka5 Ba8 246. Kb6 h2 247. Ka5 Bb7 248. Ka4 Ba8 249. Ka3 Bb7 250. Ka2 Ba8
251. Kb1 Bb7 252. Kc2 Ba8 253. Kd3 Bb7 254. Rf1 Ba8 255. Re1 Bb7 256. Rd1 Ba8
257. Kc2 Bb7 258. Kb1 Ba8 259. Ka2 Bb7 260. Ka3 Ba8 261. Ka4 Bb7 262. Ka5 Ba8
263. Kb6 h1=Q 264. Rxh1 Bg7 265. Rd1+ Bd4 266. Ka5 Bb7 267. Ka4 Ba8 268. Ka3 Bb7
269. Ka2 Ba8 270. Kb1 Bb7 271. Kc2 Ba8 272. Kd3 Bb7 273. Rf1 Ba8 274. Re1 Bb7
275. Rd1 Ba8 276. Kc2 Bb7 277. Kb1 Ba8 278. Ka2 Bb7 279. Ka3 Ba8 280. Ka4 Bb7
281. Ka5 Ba8 282. Kb6 Bb7 283. Kxb7 b1=Q 284. Rxb1 Be5 285. Rd1+ Bd4 286. Rxd4+
cxd4 287. Kb6 d3 288. a8=Q Rxb8+ 289. Qxb8 dxe2 290. Qxd8# 1-0

use rschess::pgn::Pgn;

let pgn = Pgn::try_from(include_str!("M290-study.pgn")).unwrap();
println!("{pgn}");
assert!(pgn.to_string().contains(&pgn.board().gen_movetext()));

Board::gen_movetext generates the SAN movetext of the game, excluding the game result. It is also important to note that PGN text must follow the Seven Tag Roster.

Output

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[FEN "bBrb1B2/P1n1r2p/1Kp1Pb1p/2pk1P1p/5P2/1P2pP2/1pP1P3/1R4n1 w - - 0 1"]
[SetUp "1"]

1. Rd1+ Bd4 2. c4+ Kd6 3. Rxg1 Bc3 4. Rd1+ Bd4 5. Ka5 Bb7 6. Ka4 Ba8 7. Ka3 Bb7 8. Ka2 Ba8 9. Kb1 Bb7 10. Kc2 Ba8 11. Kd3 Bb7 12. Re1 Ba8 13. Rf1 Bb7 14. Rd1 Ba8 15. Kc2 Bb7 16. Kb1 Ba8 17. Ka2 Bb7 18. Ka3 Ba8 19. Ka4 Bb7 20. Ka5 Ba8 21. Kb6 h4 22. Ka5 Bb7 23. Ka4 Ba8 24. Ka3 Bb7 25. Ka2 Ba8 26. Kb1 Bb7 27. Kc2 Ba8 28. Kd3 Bb7 29. Rf1 Ba8 30. Re1 Bb7 31. Rd1 Ba8 32. Kc2 Bb7 33. Kb1 Ba8 34. Ka2 Bb7 35. Ka3 Ba8 36. Ka4 Bb7 37. Ka5 Ba8 38. Kb6 h3 39. Ka5 Bb7 40. Ka4 Ba8 41. Ka3 Bb7 42. Ka2 Ba8 43. Kb1 Bb7 44. Kc2 Ba8 45. Kd3 Bb7 46. Rf1 Ba8 47. Re1 Bb7 48. Rd1 Ba8 49. Kc2 Bb7 50. Kb1 Ba8 51. Ka2 Bb7 52. Ka3 Ba8 53. Ka4 Bb7 54. Ka5 Ba8 55. Kb6 h2 56. Ka5 Bb7 57. Ka4 Ba8 58. Ka3 Bb7 59. Ka2 Ba8 60. Kb1 Bb7 61. Kc2 Ba8 62. Kd3 Bb7 63. Rf1 Ba8 64. Re1 Bb7 65. Rd1 Ba8 66. Kc2 Bb7 67. Kb1 Ba8 68. Ka2 Bb7 69. Ka3 Ba8 70. Ka4 Bb7 71. Ka5 Ba8 72. Kb6 h5 73. Ka5 Bb7 74. Ka4 Ba8 75. Ka3 Bb7 76. Ka2 Ba8 77. Kb1 Bb7 78. Kc2 Ba8 79. Kd3 Bb7 80. Rf1 Ba8 81. Re1 Bb7 82. Rd1 Ba8 83. Kc2 Bb7 84. Kb1 Ba8 85. Ka2 Bb7 86. Ka3 Ba8 87. Ka4 Bb7 88. Ka5 Ba8 89. Kb6 h4 90. Ka5 Bb7 91. Ka4 Ba8 92. Ka3 Bb7 93. Ka2 Ba8 94. Kb1 Bb7 95. Kc2 Ba8 96. Kd3 Bb7 97. Rf1 Ba8 98. Re1 Bb7 99. Rd1 Ba8 100. Kc2 Bb7 101. Kb1 Ba8 102. Ka2 Bb7 103. Ka3 Ba8 104. Ka4 Bb7 105. Ka5 Ba8 106. Kb6 h3 107. Ka5 Bb7 108. Ka4 Ba8 109. Ka3 Bb7 110. Ka2 Ba8 111. Kb1 Bb7 112. Kc2 Ba8 113. Kd3 Bb7 114. Rf1 Ba8 115. Re1 Bb7 116. Rd1 Ba8 117. Kc2 Bb7 118. Kb1 Ba8 119. Ka2 Bb7 120. Ka3 Ba8 121. Ka4 Bb7 122. Ka5 Ba8 123. Kb6 h6 124. Ka5 Bb7 125. Ka4 Ba8 126. Ka3 Bb7 127. Ka2 Ba8 128. Kb1 Bb7 129. Kc2 Ba8 130. Kd3 Bb7 131. Rf1 Ba8 132. Re1 Bb7 133. Rd1 Ba8 134. Kc2 Bb7 135. Kb1 Ba8 136. Ka2 Bb7 137. Ka3 Ba8 138. Ka4 Bb7 139. Ka5 Ba8 140. Kb6 h5 141. Ka5 Bb7 142. Ka4 Ba8 143. Ka3 Bb7 144. Ka2 Ba8 145. Kb1 Bb7 146. Kc2 Ba8 147. Kd3 Bb7 148. Rf1 Ba8 149. Re1 Bb7 150. Rd1 Ba8 151. Kc2 Bb7 152. Kb1 Ba8 153. Ka2 Bb7 154. Ka3 Ba8 155. Ka4 Bb7 156. Ka5 Ba8 157. Kb6 h4 158. Ka5 Bb7 159. Ka4 Ba8 160. Ka3 Bb7 161. Ka2 Ba8 162. Kb1 Bb7 163. Kc2 Ba8 164. Kd3 Bb7 165. Rf1 Ba8 166. Re1 Bb7 167. Rd1 Ba8 168. Kc2 Bb7 169. Kb1 Ba8 170. Ka2 Bb7 171. Ka3 Ba8 172. Ka4 Bb7 173. Ka5 Ba8 174. Kb6 h1=Q 175. Rxh1 Bg7 176. Rd1+ Bd4 177. Ka5 Bb7 178. Ka4 Ba8 179. Ka3 Bb7 180. Ka2 Ba8 181. Kb1 Bb7 182. Kc2 Ba8 183. Kd3 Bb7 184. Rf1 Ba8 185. Re1 Bb7 186. Rd1 Ba8 187. Kc2 Bb7 188. Kb1 Ba8 189. Ka2 Bb7 190. Ka3 Ba8 191. Ka4 Bb7 192. Ka5 Ba8 193. Kb6 h2 194. Ka5 Bb7 195. Ka4 Ba8 196. Ka3 Bb7 197. Ka2 Ba8 198. Kb1 Bb7 199. Kc2 Ba8 200. Kd3 Bb7 201. Rf1 Ba8 202. Re1 Bb7 203. Rd1 Ba8 204. Kc2 Bb7 205. Kb1 Ba8 206. Ka2 Bb7 207. Ka3 Ba8 208. Ka4 Bb7 209. Ka5 Ba8 210. Kb6 h3 211. Ka5 Bb7 212. Ka4 Ba8 213. Ka3 Bb7 214. Ka2 Ba8 215. Kb1 Bb7 216. Kc2 Ba8 217. Kd3 Bb7 218. Rf1 Ba8 219. Re1 Bb7 220. Rd1 Ba8 221. Kc2 Bb7 222. Kb1 Ba8 223. Ka2 Bb7 224. Ka3 Ba8 225. Ka4 Bb7 226. Ka5 Ba8 227. Kb6 h1=Q 228. Rxh1 Bg7 229. Rd1+ Bd4 230. Ka5 Bb7 231. Ka4 Ba8 232. Ka3 Bb7 233. Ka2 Ba8 234. Kb1 Bb7 235. Kc2 Ba8 236. Kd3 Bb7 237. Rf1 Ba8 238. Re1 Bb7 239. Rd1 Ba8 240. Kc2 Bb7 241. Kb1 Ba8 242. Ka2 Bb7 243. Ka3 Ba8 244. Ka4 Bb7 245. Ka5 Ba8 246. Kb6 h2 247. Ka5 Bb7 248. Ka4 Ba8 249. Ka3 Bb7 250. Ka2 Ba8 251. Kb1 Bb7 252. Kc2 Ba8 253. Kd3 Bb7 254. Rf1 Ba8 255. Re1 Bb7 256. Rd1 Ba8 257. Kc2 Bb7 258. Kb1 Ba8 259. Ka2 Bb7 260. Ka3 Ba8 261. Ka4 Bb7 262. Ka5 Ba8 263. Kb6 h1=Q 264. Rxh1 Bg7 265. Rd1+ Bd4 266. Ka5 Bb7 267. Ka4 Ba8 268. Ka3 Bb7 269. Ka2 Ba8 270. Kb1 Bb7 271. Kc2 Ba8 272. Kd3 Bb7 273. Rf1 Ba8 274. Re1 Bb7 275. Rd1 Ba8 276. Kc2 Bb7 277. Kb1 Ba8 278. Ka2 Bb7 279. Ka3 Ba8 280. Ka4 Bb7 281. Ka5 Ba8 282. Kb6 Bb7 283. Kxb7 b1=Q 284. Rxb1 Be5 285. Rd1+ Bd4 286. Rxd4+ cxd4 287. Kb6 d3 288. a8=Q Rxb8+ 289. Qxb8 dxe2 290. Qxd8# 1-0

From a board

The Pgn struct provides the Pgn::from_board method for creating Pgn objects using the moves on a Board.

use rschess::{Board, pgn::Pgn};

let mut board = Board::default();
board.make_moves_san("f3 e5 g4 Qh4#").unwrap();
let pgn = Pgn::from_board(
    board, // the board
    vec![  // PGN tag pairs
        ("Event", "?"),
        ("Site", "?"),
        ("Date", "????.??.??"),
        ("Round", "?"),
        ("White", "?"),
        ("Black", "?"),
    ]
    .into_iter()
    .map(|(t, v)| (t.to_owned(), v.to_owned()))
    .collect(),
)
.unwrap();
println!("{pgn}");

Output

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "0-1"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1. f3 e5 2. g4 Qh4# 0-1

In this example too, PGN must follow the Seven Tag Roster, with the exception of the Result tag, because this will be determined from the status of the game on the Board.

Pretty-printing

Pretty-printing the position from the perspective of the side whose turn it is to move:

use rschess::Board;

let board = Board::from_fen("2R5/4bppk/1p1p3Q/5R1P/4P3/5P2/r4q1P/7K b - - 6 50".try_into().unwrap());
println!("{board}");

Output

‎  ┌───┬───┬───┬───┬───┬───┬───┬───┐
1 │ ♔ │   │   │   │   │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
2 │ ♙ │   │ ♛ │   │   │   │   │ ♜ │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
3 │   │   │ ♙ │   │   │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
4 │   │   │   │ ♙ │   │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
5 │ ♙ │   │ ♖ │   │   │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
6 │ ♕ │   │   │   │ ♟ │   │ ♟ │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
7 │ ♚ │ ♟ │ ♟ │ ♝ │   │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
8 │   │   │   │   │   │ ♖ │   │   │
‎  └───┴───┴───┴───┴───┴───┴───┴───┘
‎    h   g   f   e   d   c   b   a

Pretty-printing the position from the perspective of a specific side:

use rschess::{Board, Color};

let board = Board::from_fen("2R5/4bppk/1p1p3Q/5R1P/4P3/5P2/r4q1P/7K b - - 6 50".try_into().unwrap());
println!("{}", board.pretty_print(Color::White, false));

Output

‎  ┌───┬───┬───┬───┬───┬───┬───┬───┐
8 │   │   │ ♖ │   │   │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
7 │   │   │   │   │ ♝ │ ♟ │ ♟ │ ♚ │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
6 │   │ ♟ │   │ ♟ │   │   │   │ ♕ │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
5 │   │   │   │   │   │ ♖ │   │ ♙ │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
4 │   │   │   │   │ ♙ │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
3 │   │   │   │   │   │ ♙ │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
2 │ ♜ │   │   │   │   │ ♛ │   │ ♙ │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
1 │   │   │   │   │   │   │   │ ♔ │
‎  └───┴───┴───┴───┴───┴───┴───┴───┘
‎    a   b   c   d   e   f   g   h

Pretty-printing the position with ASCII piece characters:

use rschess::{Board, Color};

let board = Board::from_fen("2R5/4bppk/1p1p3Q/5R1P/4P3/5P2/r4q1P/7K b - - 6 50".try_into().unwrap());
println!("{}", board.pretty_print(Color::Black, true));

Output

‎  ┌───┬───┬───┬───┬───┬───┬───┬───┐
1 │ K │   │   │   │   │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
2 │ P │   │ q │   │   │   │   │ r │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
3 │   │   │ P │   │   │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
4 │   │   │   │ P │   │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
5 │ P │   │ R │   │   │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
6 │ Q │   │   │   │ p │   │ p │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
7 │ k │ p │ p │ b │   │   │   │   │
‎  ├───┼───┼───┼───┼───┼───┼───┼───┤
8 │   │   │   │   │   │ R │   │   │
‎  └───┴───┴───┴───┴───┴───┴───┴───┘
‎    h   g   f   e   d   c   b   a

Position to image

To use this feature, you must first enable the img feature in Cargo.toml:

[dependencies]
rschess = { git = "https://github.com/prawnydagrate/rschess.git", features = ["img"] }

Now, the position_to_image function can be used like so:

use rschess::{Board, img};

let board = Board::from_fen("2R5/4bppk/1p1p3Q/5R1P/4P3/5P2/r4q1P/7K b - - 6 50".try_into().unwrap());
img::position_to_image(
    board.position(),                        // the position
    img::PositionImageProperties::default(), // image properties
    board.side_to_move(),                    // perspective
)
.unwrap()
.save("Carlsen-Karjakin_WCC2016_R13_4.png")
.unwrap();

Carlsen-Karjakin_WCC2016_R13_4.png

Carlsen-Karjakin_WCC2016_R13_4

Image properties

rschess allows customization of the image generated by position_to_image, using the PositionImageProperties struct. Custom colors can be provided for the light squares and the dark squares, and the size of the image can also be set. As for piece sets, a set of 25 options is available. These are some of the piece sets listed as free to use by Lichess.org.

Custom piece sets

Images of positions are not limited to the 25 built-in piece sets. Custom RgbaImages can be provided for each black and white piece. This can be done, for example, with a folder named pieces containing files named like so:

pieces
├── bB.png
├── bK.png
├── bN.png
├── bP.png
├── bQ.png
├── bR.png
├── wB.png
├── wK.png
├── wN.png
├── wP.png
├── wQ.png
└── wR.png

use image;
use rschess::{img, Board, Color, Fen};
use std::collections::HashMap;

let board = Board::from_fen(Fen::try_from("8/1r6/8/6n1/5k2/1b6/3K3N/7Q b - - 0 1").unwrap());
let mut pip = img::PositionImageProperties::default();
let mut hm = HashMap::new();
for fname in std::fs::read_dir("pieces").unwrap() {
    let fname = fname.unwrap();
    // piece name (e.g. wK, bB, wP, etc.):
    let name = String::from_utf8_lossy(fname.file_name().to_string_lossy().as_bytes()).split('.').next().unwrap().to_owned();
    // piece image:
    let piece_img = image::open(fname.path()).unwrap();
    hm.insert(name, piece_img.into());
}
pip.piece_set = img::PieceSet::Custom(hm);
img::position_to_image(board.position(), pip, Color::Black).unwrap().save("dtz1033.png").unwrap();

Examples

The examples directory features some examples of programs that rschess could be used to make. To try them, clone the GitHub repository:

$ git clone https://github.com/prawnydagrate/rschess
$ cd rschess

Then run:

$ cargo run --release --example EXAMPLENAME

History

A while ago I was looking to write a simple Rust program that simulates chess games. I'd used Python's chess library before, and knew that my task would be very easy, if Rust had a similar crate. It didn't. I soon found myself scrolling through hundreds of potential options on Crates.io, just to find nothing useful. Therefore, I asked on the Rust subreddit hoping someone would tell me about a powerful crate that no one has ever heard of lol. Of course, none of the answers were very helpful in finding a suitable crate, but u/LePfeiff's comment

Sounds like a good contribution opportunity 😉 be the change you want to see

made me think. Initially I was hesitant, but with encouragement from u/howtokillafox, the rschess project was born.

Dependencies

~0.2–1.8MB
~36K SLoC

6 releases (stable)

rschess

Table of Contents

Aim

Features

Parsing FEN

Parsing PGN

Generating legal moves

Making moves

Board status

Generating FEN

Generating PGN

From PGN text

From a board

Pretty-printing

Position to image

Image properties

Custom piece sets

Examples

History

Dependencies