Creating an opening book
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## Creating an opening book

Opening books are created or updated using the bookup command. It expects the filename of an PGN file containing one or more games in the PGN format. While parsing the PGN file Amy will output a dot for every hundred games red as a progress indicator.

Example 3.1. Creating an opening book

`White(1):` `bookup `ClassicGames.pgn``
`Parsing PGN file PGN/ClassicGames.pgn. '.'= 100 Games
......................................................................(7000)
...........................................................(12936)`

The opening book created is stored in a file name `Book.db`.

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