---------------
Stockfish is a free UCI chess engine derived from Glaurung 2.1. It is
-not a complete chess program, but requires some UCI compatible GUI
-(like XBoard with PolyGlot, eboard, Jos�, Arena, Sigma Chess, Shredder,
-Chess Partner, or Fritz) in order to be used comfortably. Read the
+not a complete chess program and requires some UCI-compatible GUI
+(e.g. XBoard with PolyGlot, eboard, Arena, Sigma Chess, Shredder, Chess
+Partner or Fritz) in order to be used comfortably. Read the
documentation for your GUI of choice for information about how to use
-Stockfish with your GUI.
+Stockfish with it.
-This version of Stockfish supports up to 8 CPUs, but has not been
-tested thoroughly with more than 2. The program tries to detect the
-number of CPUs on your computer and set the number of search threads
+This version of Stockfish supports up to 32 CPUs, but has not been
+tested thoroughly with more than 4. The program tries to detect the
+number of CPUs on your computer and sets the number of search threads
accordingly, but please be aware that the detection is not always
-correct. It is therefore recommended to inspect the value of the
+correct. It is therefore recommended to inspect the value of the
"Threads" UCI parameter, and to make sure it equals the number of CPU
-cores on your computer. If you are using more than four threads, it
-is recommended to raise the value of "Minimum Split Depth" UCI parameter
-to 6.
+cores on your computer. If you are using more than eight threads, it is
+recommended to raise the value of the "Min Split Depth" UCI parameter to
+7.
2. Files
* Readme.txt, the file you are currently reading.
- * Copying.txt, a text file containing the GNU General Public
- License.
+ * Copying.txt, a text file containing the GNU General Public License.
* src/, a subdirectory containing the full source code, including a
- Makefile that can be used to compile Stockfish on Unix-like
- systems. For further information about how to compile Stockfish
- yourself, read section 4 below.
+ Makefile that can be used to compile Stockfish on Unix-like systems.
+ For further information about how to compile Stockfish yourself read
+ section 4 below.
* polyglot.ini, for using Stockfish with Fabien Letouzey's PolyGlot
adapter.
3. Opening books
----------------
-This version of Stockfish has experimental support for PolyGlot opening
-books. For information about how to create such books, consult the
-PolyGlot documentation. The book file can be selected by setting the
-UCI parameter "Book File".
+This version of Stockfish has support for PolyGlot opening books. For
+information about how to create such books, consult the PolyGlot
+documentation. The book file can be selected by setting the "Book File"
+UCI parameter.
4. Compiling it yourself
------------------------
-On Unix-like systems, it should usually be possible to compile
-Stockfish directly from the source code with the included Makefile.
+On Unix-like systems, it should be possible to compile Stockfish
+directly from the source code with the included Makefile.
-For big-endian machines like Power PC you need to enable the proper
-flag changing from -DNBIGENDIAN to -DBIGENDIAN in the Makefile.
+Stockfish has support for 32 or 64-bit CPUs, the hardware POPCNT
+instruction, big-endian machines such as Power PC, and other platforms.
-Stockfish has POPCNT instruction runtime detection and support. This can
-give an extra speed on Core i7 or similar systems. To enable this feature
-(disabled by default) simply uncomment #define USE_POPCNT in bitcount.h
-before to compile.
-
-On 64 bit Unix-like systems the 'bsfq' assembly instruction will be used
-for bit counting. Detection is automatic at compile time, but in case you
-experience compile problems you can comment out #define USE_BSFQ line in types.h
+In general it is recommended to run 'make help' to see a list of make
+targets with corresponding descriptions. When not using Makefile to
+compile (for instance with Microsoft MSVC) you need to manually
+set/unset some switches in the compiler command line; see file "types.h"
+for a quick reference.
5. Terms of use
---------------
Stockfish is free, and distributed under the GNU General Public License
-(GPL). Essentially, this means that you are free to do almost exactly
+(GPL). Essentially, this means that you are free to do almost exactly
what you want with the program, including distributing it among your
friends, making it available for download from your web site, selling
it (either by itself or as part of some bigger software package), or
The only real limitation is that whenever you distribute Stockfish in
some way, you must always include the full source code, or a pointer
-to where the source code can be found. If you make any changes to the
+to where the source code can be found. If you make any changes to the
source code, these changes must also be made available under the GPL.
For full details, read the copy of the GPL found in the file named
Copying.txt.
-
-
-6. Feedback
------------
-
-The author's e-mail address is mcostalba@gmail.com
projects / stockfish / blobdiff