### Overview
+[![Build Status](https://travis-ci.org/official-stockfish/Stockfish.svg?branch=master)](https://travis-ci.org/official-stockfish/Stockfish)
+[![Build Status](https://ci.appveyor.com/api/projects/status/github/official-stockfish/Stockfish?svg=true)](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
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.
The "SyzygyProbeLimit" option should normally be left at its default value.
-**What to expect**
+**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.
+a position with 8 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.
set/unset some switches in the compiler command line; see file *types.h*
for a quick reference.
+### Resource For Understanding the Code Base
+
+* [Chess Programming Wiki](https://www.chessprogramming.org/Main_Page)
+has good overall chess engines explanations
+(techniques used here are well explained like hash maps etc), it was
+also recommended by the [support team at stockfish.](http://support.stockfishchess.org/discussions/questions/1132-how-to-understand-stockfish-sources)
+
+* [Here](https://www.chessprogramming.org/Stockfish) you can find a set
+of features and techniques used by Stockfish and each of them is explained
+at the wiki, however, it's a generic way rather than focusing on Stockfish's
+own implementation, but it will still help you.
+
### Terms of use
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*.