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- With this release of Gnuchess the book file is being switched from a text-based file to
- a binary file. Where in the past the book file was "gnuchess.book" now the primary
- book file is "gnuchess.book.data". It is intended that text book files will only be
- used to generate the binary file.
-
- The GDX based bookfile is the standard binary bookfile and should be used. This means the -DGDX
- compile option should be used and the instructions for generating a GDX book followed. The Makefile
- will generate a GDX book for the basic gnuchess.book text file if "make install" is entered or
- if "make gnuchess.book.data" is entered. Larger opening databases can be created using the opening
- data in the misc directory. If you use other than GDX based books follow the instructions below.
-
- COMPILE TIME
-
- There are now three choices for the binary book file at compile time.
-
- Compile option -DGDBM creates a GNU-dbm based book. It is fast carefree but
- not very space efficient and slow to generate. It is highly recommended that it
- be done on a memory based file system.
-
- Compile option -DGDX creates a random file based book file. It is space efficient
- medium fast to generate, and allows large books.
-
- If neither of the above options is choosen the memory based book is generated.
- The size of the book is then dependent on the memory you have available.
-
-
- Creating a Binary book file.
-
-
-
- *GDX based.
-
- GDX based creates a disk based hash file. You must specify the size of the file.
- It is the most efficient book to use.
-
- gnuchessr -b textfile -B binaryfile -S #entries [-P plys]
-
- "#entries" is the number of unique position/move combinations that will be kept plus an extra 20-30%
- since this is a hashfile. The size of the file will be:
-
- 12 + (#entries)*12
-
- A book with 528k moves which resulted in 319k entries. There can be
- multiple entries for a position. I put this in a binary file with space
- for 450k entries and it took about 5 meg.
-
-
-
-
- GDBM based.
-
- Use gnuchessr.
-
- gnuchessr -b textfile -B binaryfile [ -P plys ]
-
- will read the text book file "textfile" add create a gdbm file "binaryfile".
- Data for 28 plys (14 moves each side) will be stored, unless the -P option
- is specified. With -P you can specify the number of plys. Less plys less space.
-
- You then just move the binary file from your memory based file system to
- the name and path specified in the Makefile for BINBOOKFILE and it will use it.
-
-
- *Memory based.
-
- Memory based bookfiles are produced just like GDX based.
-
-
-
- Misc.
-
- You can add entries to an existing binary file. If the binary file exists the entries in the text file
- will be added to the binary file.
-
-
- If possible use a memory based file system when generating a binary book file. It will go much faster.
-