Utility to Convert chess Database to PGN Opening Repertoire

[Spill_The_Tea]

Hi all,

I often find opening books in pgn format, such as Balsa Opening Suite for example:
https://sites.google.com/site/computers ... test-suite

Does anyone know if there is a utility to make something similar, from a database of chess games? Essentially polyglot, but remaining in pgn format.

[xr_a_y]

Same question ! is there a command line tool somewhere ?

[Spill_The_Tea]

Same question ! is there a command line tool somewhere ?

Since I posted this, I learned about using the --plylimit option flag from pgn-extract.

In theory, you could successively use pgn-extract to first
1. Limit Ply (--plylimit), Remove All tags (--notags)
2. Remove Duplicates (-D), Add 7-tag Roster (-7) and ECO Codes (-e) Back to Games, and (if desired) output on a single line (-w1000)

[Ferdy]

Hi all,

I often find opening books in pgn format, such as Balsa Opening Suite for example:
https://sites.google.com/site/computers ... test-suite

Does anyone know if there is a utility to make something similar, from a database of chess games? Essentially polyglot, but remaining in pgn format.

What do you mean by essentially polyglot?

[xr_a_y]

pgn-extract can handle .ctg file ?

[Spill_The_Tea]

pgn-extract can handle .ctg file ?

No, I don't believe so. I don't use chessbase, but from my understanding, ctg is a book file (analogous to polyglot bin opening books), not a database (cbh)?