capitalist-chess

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capitalist-chess

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An engine for a chess variant which adds banks🏦 and a market📈!

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// repository documentation

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# State Capitalist Chess

![Header](https://raw.githubusercontent.com/adam-mcdaniel/capitalist-chess/main/assets/header.png)

This repository implements chess but with a state-capitalist twist. The game is played on a traditional chess board with traditional chess pieces.

## Rules

The rules are the same as in traditional chess, with the following exceptions:
1. The game is played by two players, each representing their own nation-state.
2. Each nation-state has a national bank, which is used to fund the war effort.
    - Nation-states start with a base amount of currency **(measured in 1¢ pennies or 10¢ doubloons)**.
    - Nation-states receive additional currency at the end of their turn by taxing their controlled territories: the 2x2 "sectors" they control. The four center sectors are each worth 2 doubloons per turn (20¢), and the remaining 12 sectors are each worth 1 doubloon per turn (10¢).
3. Nation-states can use their currency to purchase additional pieces, which must be purchased on their two "home rows" (rows 1 and 2 for white, rows 7 and 8 for black).
4. Nation-states may play multiple moves per turn, *for an exponential cost*.
    - Each move has a base cost of 1 doubloon, and each additional move accrues interest at a rate of 200%. For example, the first move costs 1 doubloon, the second move costs 2 doubloons, the third move costs 4 doubloons, and so on.
    - These moves may can be used to move pieces, capture enemy pieces, or purchase new pieces.
5. A nation-state may not purchase pieces while they are in check.

|Piece Type|Cost|
|---|---|
|Pawn ♟︎|2 doubloons|
|Knight ♞|6 doubloons|
|Bishop ♝|6.2 doubloons|
|Rook ♜|10 doubloons|
|Queen ♛|18 doubloons|
|King ♚|200 doubloons|

6. The game ends when a nation-state has no legal moves remaining. This occurs when:
    - The nation-state's king is in checkmate.
    - The nation-state has no pieces remaining.
    - The nation-state is bankrupt and can no longer afford the war effort.

![Battle](https://raw.githubusercontent.com/adam-mcdaniel/capitalist-chess/main/assets/battle.png)

## Setup

To play the game, clone the repository and run the following command:

```bash
cargo run --release
```

This will start a game with the default settings, playing against a greedy capitalist AI with a move depth of 4.

![Gameplay](https://raw.githubusercontent.com/adam-mcdaniel/capitalist-chess/main/assets/gameplay.png)

### Controls

Moves can be entered in algebraic notation. For example, to move the pawn at e2 to e4, you would enter `e2e4`. You can also enter just `e4` to allow the engine to infer which pawn to move.

To purchase a piece, enter `$` followed by the piece type and the square to place the piece. For example, to purchase a knight on e1, you would enter `$Ne1`.

To play multiple moves in order, separate the moves with a space. For example, to move the pawn at e2 to e4 and then purchase a knight on e1, you would enter `e2e4 $Ne1`.

## Usage as a Library

You can write your own interface to the game engine by using it as a library. Here's an example program which does this.

```rust
use capitalist_chess::*;
use std::{str::FromStr, io::{stdin, stdout, Write}};

fn main() {
    let mut board = StateCapitalistBoard::default();

// Loop and read moves from stdin
    loop {
        let legal_moves = SimpleEngine.legal_moves(&board);
        for (i, legal_move) in legal_moves.iter().enumerate() {
            let cost = board.get_bank(board.whose_turn()).get_market().get_move_value(legal_move);
            println!("{i}. {legal_move:?} ({cost})", i=i+1);
        }
        println!("{board}");

if board.whose_turn() == Color::Black {
            eprintln!("Engine is thinking...");
            let result = SimpleEngine.best_move(&board).unwrap();
            println!("Engine move: {result:?}");
            board.apply(result).unwrap();
            continue;
        }

print!("Enter a move:\n> ");
        // Flush stdout
        stdout().flush().unwrap();
        
        let mut input = String::new();
        stdin().read_line(&mut input).unwrap();
        let input = input.trim();

if input == "exit" {
            break;
        }

if let Ok(player_move) = Move::from_str(input) {
            println!("{player_move:?}");
            if board.is_legal_move(&player_move) {
                println!("Legal move!");
            } else {
                println!("Illegal move!");
                continue;
            }

if board.apply(player_move).is_err() {
                println!("Illegal move!");
            }
        } else {
            println!("Invalid move!");
        }
    }
}
```

## License

This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

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