From Juergen Haas,
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Definition: pgn-extract: a Portable Game Notation (PGN) extractor Pgn-extract is a program to extract selected games from a collection of chess games in PGN format. There are several ways to specify the criteria on which to extract: textual move sequences, the position reached after a sequence of moves, information in the tag fields, and material balance in the ending. From Debian 3.0r0 APT

* Linux/Unix/Computing Glossary