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A draughts (checkers) library for Python with move generation, PDN reading and writing, engine communication and balloted openings

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# pydraughts
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pydraughts is a draughts (checkers) library for Python with move generation, SVG visualizations, PDN reading and writing, engine communication and balloted openings. It is based on [ImparaAI/checkers](https://github.com/ImparaAI/checkers).

Installing
----------

Download and install the latest release:

pip install pydraughts

## Features

**Variants:**
* Standard (International)
* Frisian
* frysk!
* Antidraughts
* Breakthrough
* Russian
* Brazilian
* English/American
* Italian
* Turkish

**Engine protocols:**
* Hub
* DXP
* CheckerBoard

**PDN Reading and Writing**
<br/></br>
* Import pydraughts
```python
from draughts import Board, Move, WHITE, BLACK
```
* Create a game
```python
board = Board(variant="standard", fen="startpos")
```
* Make a move
```python
move = Move(board, steps_move=[34, 30])
board.push(move)

# Multi-capture
board2 = Board(fen="W:WK40:B19,29")
board2.push(Move(board2, pdn_move='40x14'))
```
* Get a visual representation of the board as SVG
```python
from draughts import svg
svg.create_svg(Board(fen="B:W16,19,33,34,47,K4:B17,25,26"))
```
![SVG Board](https://raw.githubusercontent.com/AttackingOrDefending/pydraughts/main/examples/board.svg)
* Get a visual representation of the board in the terminal
```python
print(board)

"""
   | b |   | b |   | b |   | b |   | b 
---------------------------------------
 b |   | b |   | b |   | b |   | b |   
---------------------------------------
   | b |   | b |   | b |   | b |   | b 
---------------------------------------
 b |   | b |   | b |   | b |   | b |   
---------------------------------------
   |   |   |   |   |   |   |   |   |   
---------------------------------------
   |   |   |   |   |   |   |   | w |   
---------------------------------------
   | w |   | w |   | w |   |   |   | w 
---------------------------------------
 w |   | w |   | w |   | w |   | w |   
---------------------------------------
   | w |   | w |   | w |   | w |   | w 
---------------------------------------
 w |   | w |   | w |   | w |   | w |   
"""
```
* Get legal moves
```python
moves = board.legal_moves()
```
* Detect wins and draws
```python
has_white_won = board.winner() == WHITE
is_draw = board.winner() == 0
winnner = board.winner()
is_game_over = board.is_over()
```
* Convert move to other types
```python
move = Move(board, board_move=moves[0].board_move).pdn_move
```
* Get fen
```python
fen = game.fen
```
* Communicate with engines
```python
from draughts.engine import HubEngine, Limit
engine = HubEngine(["scan.exe", "hub"])
engine.init()
limit = Limit(time=10)
engine_move = engine.play(board, limit, ponder=False)
```
* Read PDN games
```python
from draughts.PDN import PDNReader
games = PDNReader(filename=filepath)
game = games.games[0]
moves = game.moves
```
* Write PDN games
```python
from draughts.PDN import PDNWriter
games = PDNWriter(filename=filepath, board=board)
```
* Get a ballot
```python
from draughts.ballots import Ballots
ballots = Ballots('english')
ballot1 = ballots.get_ballot()
ballot2 = ballots.get_ballot()
```
* Run tournaments
```python
from draughts.tournament import RoundRobin
player1 = (["scan.exe", "hub"], "hub", {}, None)
player2 = ("kr_hub.exe", "hub", {}, None)
players = [player1, player2]
tournament = RoundRobin("tournament.pdn", players, start_time=20, increment=0.2, games_per_pair=4)
scores = tournament.play()
print(scores)
tournament.print_standings()
```

## Example Engines
Some engines that can be used with `pydraughts`.

| Engine                                                                                     | Protocol     |
|:-------------------------------------------------------------------------------------------|:-------------|
| [Kingsrow (international)](https://edgilbert.org/InternationalDraughts/download_links.htm) | Hub & DXP    |
| [Scan](https://hjetten.home.xs4all.nl/scan/scan.html)                                      | Hub & DXP    |
| [Moby Dam](https://hjetten.home.xs4all.nl/mobydam/mobydam.html)                            | DXP          |
| [Kingsrow (english)](https://edgilbert.org/EnglishCheckers/KingsRowEnglish.htm)            | CheckerBoard |
| [Kingsrow (italian)](https://edgilbert.org/ItalianCheckers/KingsRowItalian.htm)            | CheckerBoard |
| [Cake](https://www.fierz.ch/download.php)                                                  | CheckerBoard |
| [Kallisto](https://www.igorkorshunov.narod.ru/Draughts/Kallisto4.rar)                      | CheckerBoard |

## Selected Projects
If you like, share your interesting project that uses pydraughts.

| Projects                                                              |
|-----------------------------------------------------------------------|
| Checkers Reinforcement Learning — https://github.com/d3da/checkers-rl |

## Acknowledgements
Thanks to [fishnet](https://github.com/lichess-org/fishnet/tree/ebd2a5e16d37135509cbfbff9998e0b798866ef5) which was modified to add support for Hub engines. Thanks to [akalverboer](https://github.com/akalverboer) for their [DXC100_draughts_client](https://github.com/akalverboer/DXC100_draughts_client) which was modified to add support for DXP engines.

## License
pydraughts is licensed under The MIT License. Check out `LICENSE` for the full text.
The licenses of the other projects that pydraughts uses are in the `other_licenses` folder.

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