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, José, 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.

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
accordingly, but please be aware that the detection is not always
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.

Authors:
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Marco Costalba

Tord Romstad

Joona Kiiski

Salvo Spitaleri (opening book "Book.bin")