Draw a tree of moves from PGN files using Graphviz

Graphviz 2.42.2 https://graphviz.org/download/

Python 3.9

Python libraries:

• python-chess 1.9.0 (https://github.com/niklasf/python-chess)
• graphviz 0.19.1 (https://github.com/xflr6/graphviz)
• Can be installed using pip: $ pip install chess graphviz

Main source: diagram2.py

$ python3 diagram2.py input

• input: path to the .pgn file
• For example: $ python3 diagram2.py ViennaTest.pgn

By default, the program draws from the first move to the last move. To change this, specify the command-line arguments as follows:

$ python3 diagram2.py -s START -e END input

• START: the first step
• END: the last step
• For example: $ python3 diagram2.py -s 4 -e 9 ViennaTest.pgn

To print full usage:

$ python3 diagram2.py --help

usage: diagram2.py [-h] [-s START] [-e END] input

Draw moves from a PGN file

positional arguments:
  input                 Input pgn file

optional arguments:
  -h, --help            show this help message and exit
  -s START, --start START
                        First step (default: 1)
  -e END, --end END     Last step (default: max)

Main source: diagram.py

$ python3 diagram.py input

• input: path to the .pgn file
• For example: $ python3 diagram.py Nimzo-4-Bg5.pgn

By default, the program draws from the 4th move to the 18th move. To change this, specify the command-line arguments as follows:

$ python3 diagram.py -s START -e END input

• START: the first step
• END: the last step
• For example: $ python3 diagram.py -s 3 -e 19 Nimzo-4-Bg5.pgn

To print full usage:

$ python3 diagram.py --help

A diagram-<input>.gv.pdf file storing the output diagram, and a diagram-<input>.gv file storing the diagram in DOT language.