### 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
documentation for your GUI of choice for information about how to use
Stockfish with it.
-This version of Stockfish supports up to 128 cores. The engine defaults
+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.
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*
+*Copying.txt*.