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Stockfish is an open source chess engine, developed by Tord Romstad, Joona Kiiski and Marco Costalba and licensed under the GNU General Public License version 3. The current version 2.0.1 (as of January 4, 2011) is available as C++ source code, and also has precompiled versions for Microsoft Windows and Linux 32-bit/64-bit. For Mac OS X Snow Leopard 64-bit version 1.9.1 is available. The program uses the UCI protocol and can therefore be operated under various graphical interfaces. It can use up to sixteen CPU cores in multiprocessor systems. The maximum size of the transposition tables is eight gigabytes. Stockfish implements an advanced alpha-beta search and uses bitboards.

In various computer chess rankings Stockfish 2.0.1 is second or third behind the top free program Houdini and the commercial program Rybka.

The program originated from another open source program by Romstad named Glaurung. Stockfish was forked from the 2.1 version of Glaurung; the latest Glaurung version 2.2 was released December 2008 but is no longer developed.

References

1. "CEGT 40/20". Chess Engines Grand Tournament. 20 April 2010. Retrieved 20 April 2010.
2. "CCRL 40/40". Computer Chess Rating Lists. 23 April 2010. Retrieved 24 April 2010.
3. IPON; Ponder ON rating list

External links

• Website
• Interview with the programmers (March 28, 2010)

• Chess engines
• Free software programmed in C++