Chess turn engine

Turn engine fully implements all chess rules so it could be used to play chess or to make chess simulations.

Engine provides a list of available and playable turns after each turn is played. Any turn from the list can be played. Any played turn can be undone.

Input for the engine are chess turns written in algebraic chess notation format. But for the simplicity sake, one can use AvailableTurn struct to transform simple layman's turn Move piece from square A to square B into a chess notation turn.

Display

Chess engine provides a basic set of tools to print out the board state in ASCII format. Few options are available for printing out the board state. Turn history can be printed out. Captured pieces can be printed out.

ViewMode::SimpleAscii - Quite simple display format

Legend

• b: Black player
• w: White player
• P: Pawn
• N: Knight
• B: Bishop
• R: Rook
• K: King

• Q: Queen

  Example

  text 8 bR bN bB bQ bK bB bN bR 7 bP bP bP bP bP bP bP bP 6 - + - + - + - + 5 + - + - + - + - 4 - + - + - + - + 3 + - + - + - + - 2 wP wP wP wP wP wP wP wP 1 wR wN wB wQ wK wB wN wR a b c d e f g h

  ViewMode::FancyTui - Colorful terminal ASCII display format

Note: colors are not visible in documentation pages

Example

text 8 ♜ ♞ ♝ ♛ ♚ ♝ ♞ ♜ 7 ♟ ♟ ♟ ♟ ♟ ♟ ♟ ♟ 6 5 4 3 2 ♙ ♙ ♙ ♙ ♙ ♙ ♙ ♙ 1 ♖ ♘ ♗ ♕ ♔ ♗ ♘ ♖ a b c d e f g h

Example with six straightforward turns played

``` use chessturnengine::{ ChessTurnEngine, DisplayOption, Setup, ViewMode, Gamestate };

let mut cte = ChessTurnEngine::new(Setup::Normal).unwrap(); let turns = ["h4", "Na6", "h5", "b5", "d3", "g6"];

turns.iter().foreach(|turn| { cte.playturn(turn); });

for turn in cte.available_turns() { println!("{}", turn); }

// Output: // AvailableTurn (src: h5, dst: h6, piece: Pawn, captured: None, turn: h6 // AvailableTurn (src: h5, dst: g6, piece: Pawn, captured: Some("Pawn"), turn: hxg6 // AvailableTurn (src: d3, dst: d4, piece: Pawn, captured: None, turn: d4 // AvailableTurn (src: a2, dst: a3, piece: Pawn, captured: None, turn: a3 // AvailableTurn (src: a2, dst: a4, piece: Pawn, captured: None, turn: a4 // AvailableTurn (src: b2, dst: b3, piece: Pawn, captured: None, turn: b3 // AvailableTurn (src: b2, dst: b4, piece: Pawn, captured: None, turn: b4 // AvailableTurn (src: c2, dst: c3, piece: Pawn, captured: None, turn: c3 // AvailableTurn (src: c2, dst: c4, piece: Pawn, captured: None, turn: c4 // AvailableTurn (src: e2, dst: e3, piece: Pawn, captured: None, turn: e3 // AvailableTurn (src: e2, dst: e4, piece: Pawn, captured: None, turn: e4 // AvailableTurn (src: f2, dst: f3, piece: Pawn, captured: None, turn: f3 // AvailableTurn (src: f2, dst: f4, piece: Pawn, captured: None, turn: f4 // AvailableTurn (src: g2, dst: g3, piece: Pawn, captured: None, turn: g3 // AvailableTurn (src: g2, dst: g4, piece: Pawn, captured: None, turn: g4 // AvailableTurn (src: b1, dst: c3, piece: Knight, captured: None, turn: Nc3 // AvailableTurn (src: b1, dst: a3, piece: Knight, captured: None, turn: Na3 // AvailableTurn (src: b1, dst: d2, piece: Knight, captured: None, turn: Nd2 // AvailableTurn (src: c1, dst: d2, piece: Bishop, captured: None, turn: Bd2 // AvailableTurn (src: c1, dst: e3, piece: Bishop, captured: None, turn: Be3 // AvailableTurn (src: c1, dst: f4, piece: Bishop, captured: None, turn: Bf4 // AvailableTurn (src: c1, dst: g5, piece: Bishop, captured: None, turn: Bg5 // AvailableTurn (src: c1, dst: h6, piece: Bishop, captured: None, turn: Bh6 // AvailableTurn (src: d1, dst: d2, piece: Queen, captured: None, turn: Qd2 // AvailableTurn (src: e1, dst: d2, piece: King, captured: None, turn: Kd2 // AvailableTurn (src: g1, dst: h3, piece: Knight, captured: None, turn: Nh3 // AvailableTurn (src: g1, dst: f3, piece: Knight, captured: None, turn: Nf3 // AvailableTurn (src: h1, dst: h2, piece: Rook, captured: None, turn: Rh2 // AvailableTurn (src: h1, dst: h3, piece: Rook, captured: None, turn: Rh3 // AvailableTurn (src: h1, dst: h4, piece: Rook, captured: None, turn: Rh4 ```

Example with two turns played

``` let mut cte = ChessTurnEngine::new(Setup::Normal).unwrap(); assert!(cte.playturn("d4").isok()); // Play "d4", starting turn

// Play a random turn for the black player let mut nextrandomturn = String::from(cte.availableturns().first().unwrap().getturn()); assert!(cte.playturn(&nextrandomturn).isok());

// Play "a3" turn using only info about the source and destination squares for turn in cte.availableturns() { if turn.src != String::from("a2") && turn.dst != String::from("a3") { continue; } nextrandomturn = String::from(turn.getturn()); break; } assert!(cte.playturn(&nextrandomturn).isok()); assert_eq!(cte.gamestate(), Gamestate::Ongoing);

cte.displayonscreen(DisplayOption::BoardView(ViewMode::SimpleAscii)); // 8 bR bN bB bQ bK bB bN bR // 7 bP bP bP - bP bP bP bP // 6 - + - + - + - + // 5 + - + bP + - + - // 4 - + - wP - + - + // 3 wP - + - + - + - // 2 - wP wP + wP wP wP wP // 1 wR wN wB wQ wK wB wN wR // a b c d e f g h ```