Quickstart
=======================================

Basics
------

Below is an example of creating a board, generating legal moves at the starting position, displaying them, and making a move.

.. code:: python

    >>> import cshogi

    >>> board = cshogi.Board()

    >>> for move in board.legal_moves:
    ...     print(cshogi.move_to_usi(move))

::

    1g1f
    2g2f
    3g3f
    4g4f
    5g5f
    6g6f
    7g7f
    ...

.. code:: python

    >>> board.push_usi('7g7f')

Features
--------

* Integration with IPython/Jupyter Notebook

  .. code:: python

      >>> board

  .. image:: https://raw.githubusercontent.com/wiki/TadaoYamaoka/cshogi/images/board.svg?sanitize=true

* Playing/Undoing Moves

  .. code:: python

      >>> move = board.push_usi('7g7f') # Play a move

      >>> board.pop() # Undo the move

* Displaying the Board in Text Format

  .. code:: python

      >>> board = Board('ln4skl/3r1g3/1p2pgnp1/p1ppsbp1p/5p3/2PPP1P1P/PPBSSG1P1/2R3GK1/LN5NL b P 43')
      >>> print(board)

  ::
    
        '  9  8  7  6  5  4  3  2  1
        P1-KY-KE *  *  *  * -GI-OU-KY
        P2 *  *  * -HI * -KI *  *  * 
        P3 * -FU *  * -FU-KI-KE-FU * 
        P4-FU * -FU-FU-GI-KA-FU * -FU
        P5 *  *  *  *  * -FU *  *  * 
        P6 *  * +FU+FU+FU * +FU * +FU
        P7+FU+FU+KA+GI+GI+KI * +FU * 
        P8 *  * +HI *  *  * +KI+OU * 
        P9+KY+KE *  *  *  *  * +KE+KY
        P+00FU
        +

* Check Determination, Game End Determination, Nyugyoku Declaration Judgment

  .. code:: python

      >>> board.is_check()
      False
      >>> board.is_game_over()
      True
      >>> board.is_nyugyoku()
      False
      
* Repetition Draw Determination

  .. code:: python

      >>> board.is_draw() == REPETITION_DRAW # There's one or more identical positions
      False

* Move Representation

  Moves are handled as numbers. They can be converted to USI or CSA format with helper functions.

  .. code:: python

      >>> move = list(board.legal_moves)[0]
      >>> move
      66309
      >>> move_to_usi(move)
      '1g1f'
      >>> move_to_csa(move)
      '1716FU'

  Moves can be converted from USI or CSA format to numerical form.

  .. code:: python

      >>> board.move_from_usi('7g7f')
      73275
      >>> board.move_from_csa('7776FU')
      73275

* Position Compression Format

  Can read teacher positions generated by Apery and YaneuraOu.
  
  .. code:: python

      >>> import numpy as np
      
      >>> hcpes = np.fromfile('teacher.hcpe', dtype=cshogi.HuffmanCodedPosAndEval) # Apery's teacher positions (HuffmanCodedPosAndEval)
      >>> board.set_hcp(hcpes[0]['hcp'])
      
      >>> psfens = np.fromfile('sfen.bin', dtype=cshogi.PackedSfenValue) # YaneuraOu's teacher positions (PackedSfenValue)
      >>> board.set_psfen(psfens[0]['sfen'])

  Positions can be saved in Apery's compression format.
  
  .. code:: python

      >>> hcps = np.empty(1, dtype=cshogi.HuffmanCodedPos)
      >>> board.to_hcp(hcps)
      >>> hcps.tofile('hcp')

* USI Engine Control

  Can launch and control a USI engine.
  
  .. code:: python

      >>> from cshogi.usi import Engine
      
      >>> engine = Engine('/content/LesserkaiSrc/Lesserkai/Lesserkai')
      >>> engine.isready()
      >>> engine.position(sfen='sfen 7nl/5kP2/3p2g1p/2p1gp3/p6sP/s1BGpN3/4nPSp1/1+r4R2/L1+p3K1L w GSNLPb6p 122')
      >>> engine.go()

* Matches Between USI Engines

  .. code:: python

      >>> from cshogi import cli
      
      >>> cli.main('/content/LesserkaiSrc/Lesserkai/Lesserkai', '/content/LesserkaiSrc/Lesserkai/Lesserkai')