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-### Overview
-
-[](https://travis-ci.org/official-stockfish/Stockfish)
-[](https://ci.appveyor.com/project/mcostalba/stockfish)
-
-Stockfish is a free UCI chess engine derived from Glaurung 2.1. It is
-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 it.
-
-This version of Stockfish supports up to 512 cores. The engine defaults
-to one search thread, so 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.
-
-This version of Stockfish has support for Syzygybases.
-
-
-### Files
-
-This distribution of Stockfish consists of the following files:
-
- * Readme.md, the file you are currently reading.
-
- * 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.
-
-
-### Syzygybases
-
-**Configuration**
-
-Syzygybases are configured using the UCI options "SyzygyPath",
-"SyzygyProbeDepth", "Syzygy50MoveRule" and "SyzygyProbeLimit".
-
-The option "SyzygyPath" should be set to the directory or directories that
-contain the .rtbw and .rtbz files. Multiple directories should be
-separated by ";" on Windows and by ":" on Unix-based operating systems.
-**Do not use spaces around the ";" or ":".**
-
-Example: `C:\tablebases\wdl345;C:\tablebases\wdl6;D:\tablebases\dtz345;D:\tablebases\dtz6`
-
-It is recommended to store .rtbw files on an SSD. There is no loss in
-storing the .rtbz files on a regular HD.
-
-Increasing the "SyzygyProbeDepth" option lets the engine probe less
-aggressively. Set this option to a higher value if you experience too much
-slowdown (in terms of nps) due to TB probing.
-
-Set the "Syzygy50MoveRule" option to false if you want tablebase positions
-that are drawn by the 50-move rule to count as win or loss. This may be useful
-for correspondence games (because of tablebase adjudication).
-
-The "SyzygyProbeLimit" option should normally be left at its default value.
-
-**What to expect**
-If the engine is searching a position that is not in the tablebases (e.g.
-a position with 7 pieces), it will access the tablebases during the search.
-If the engine reports a very large score (typically 123.xx), this means
-that it has found a winning line into a tablebase position.
-
-If the engine is given a position to search that is in the tablebases, it
-will use the tablebases at the beginning of the search to preselect all
-good moves, i.e. all moves that preserve the win or preserve the draw while
-taking into account the 50-move rule.
-It will then perform a search only on those moves. **The engine will not move
-immediately**, unless there is only a single good move. **The engine likely
-will not report a mate score even if the position is known to be won.**
-
-It is therefore clear that behaviour is not identical to what one might
-be used to with Nalimov tablebases. There are technical reasons for this
-difference, the main technical reason being that Nalimov tablebases use the
-DTM metric (distance-to-mate), while Syzygybases use a variation of the
-DTZ metric (distance-to-zero, zero meaning any move that resets the 50-move
-counter). This special metric is one of the reasons that Syzygybases are
-more compact than Nalimov tablebases, while still storing all information
-needed for optimal play and in addition being able to take into account
-the 50-move rule.
-
-
-### Compiling it yourself
-
-On Unix-like systems, it should be possible to compile Stockfish
-directly from the source code with the included Makefile.
-
-Stockfish has support for 32 or 64-bit CPUs, the hardware POPCNT
-instruction, big-endian machines such as Power PC, and other platforms.
-
-In general it is recommended to run `make help` to see a list of make
-targets with corresponding descriptions. When not using the 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.
-
-
-### 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
-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
-using it as the starting point for a software project of your own.
-
-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
-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*.
projects / stockfish / blobdiff