71 lines
2.7 KiB
Markdown
71 lines
2.7 KiB
Markdown
### Overview
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Stockfish is a free UCI chess engine derived from Glaurung 2.1. It is
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not a complete chess program and requires some UCI-compatible GUI
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(e.g. XBoard with PolyGlot, eboard, Arena, Sigma Chess, Shredder, Chess
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Partner or Fritz) in order to be used comfortably. Read the
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documentation for your GUI of choice for information about how to use
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Stockfish with it.
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This version of Stockfish supports up to 128 CPUs. The engine defaults
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to one search thread, so it is therefore recommended to inspect the value of
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the *Threads* UCI parameter, and to make sure it equals the number of CPU
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cores on your computer.
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### Files
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This distribution of Stockfish consists of the following files:
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* Readme.md, the file you are currently reading.
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* Copying.txt, a text file containing the GNU General Public License.
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* src, a subdirectory containing the full source code, including a Makefile
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that can be used to compile Stockfish on Unix-like systems. For further
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information about how to compile Stockfish yourself read section below.
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* polyglot.ini, for using Stockfish with Fabien Letouzey's PolyGlot
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adapter.
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### Opening books
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This version of Stockfish has support for PolyGlot opening books. For
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information about how to create such books, consult the PolyGlot
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documentation. The book file can be selected by setting the *Book File*
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UCI parameter.
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### Compiling it yourself
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On Unix-like systems, it should be possible to compile Stockfish
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directly from the source code with the included Makefile.
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Stockfish has support for 32 or 64-bit CPUs, the hardware POPCNT
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instruction, big-endian machines such as Power PC, and other platforms.
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In general it is recommended to run `make help` to see a list of make
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targets with corresponding descriptions. When not using the Makefile to
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compile (for instance with Microsoft MSVC) you need to manually
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set/unset some switches in the compiler command line; see file *types.h*
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for a quick reference.
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### Terms of use
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Stockfish is free, and distributed under the **GNU General Public License**
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(GPL). Essentially, this means that you are free to do almost exactly
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what you want with the program, including distributing it among your
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friends, making it available for download from your web site, selling
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it (either by itself or as part of some bigger software package), or
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using it as the starting point for a software project of your own.
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The only real limitation is that whenever you distribute Stockfish in
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some way, you must always include the full source code, or a pointer
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to where the source code can be found. If you make any changes to the
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source code, these changes must also be made available under the GPL.
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For full details, read the copy of the GPL found in the file named
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*Copying.txt*
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