Stockfish – strong open source chess engine

Stockfish is an open source chess engine originally derived from Glaurung 2.1. It is not a complete chess program, but requires some UCI compatible Graphical User Interface (like XBoard with PolyGlot, eboard, Jose, Arena, Sigma Chess, Shredder, Chess Partner, or Fritz) in order to be used comfortably.

It can use up to eight CPU cores in multiprocessor systems. The maximum size of the transposition tables is eight gigabytes.

Its strength is comparable to the commercial Rybka chess engine, and just ahead of Naum.

Stockfish is an alpha-beta searcher and uses a bitboard representation.

Features include:

  • Supports up to 8 CPUs.
  • ELO Rating of 3210.
  • Complex (and hopefully better) material balance evaluation.
  • Ponder, setup and analysis mode.
  • Compatible with PolyGot (.bin) opening books.
  • Multi-PV (Principal Variation) extension.
  • Chess960 support.
  • 32 and 64-bit versions.

Support: Blog
Developer: Tord Romstad, Marco Costalba, Joona Kiiski
License: GNU GPL v3

Stockfish is written in C++. Learn C++ with our recommended free books and free tutorials.

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