Freyr

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Freyr, a WinBoard compliant open source chess engine by Andrei Fortuna, written in C++, intended as a test ground for various chess algorithms, first released in February 2000.

=Description= Freyr is a bitboard engine and uses rotated bitboards to determine sliding piece attacks. The search is PVS with null move pruning inside an aspiration window iterative deepening framework with transposition table, using several move ordering heuristics, such as killer, history and countermove, as well as SEE to order captures. Lazy evaluation considers incremental updated material- and piece-square table scores and cached pawn structure stuff. Evaluation further includes king safety and passed pawns as most dominant terms.

=See also=
 * Thor's Hammer

=Forum Posts=
 * New Winboard Program by Đorđe Vidanović, Winboard Forum, February 15, 2000
 * A New Release of my Amateur Chess Engine Freyr by Andrei Fortuna, CCC, February 22, 2000
 * Freyr 0.960 released by Andrei Fortuna, Winboard Forum, February 29, 2000
 * A Question on simple Alpha-Beta versus PVS/Negascout by Andrei Fortuna, CCC, March 21, 2000 » Alpha-Beta, Principal Variation Search, NegaScout
 * Freyr 0.987 Released by Andrei Fortuna, Winboard Forum, April 30, 2000
 * Freyr 1.015 Released by Andrei Fortuna, Winboard Forum, May 29, 2000
 * Freyr 1.024 sees the daylight by Andrei Fortuna, Winboard Forum, June 02, 2000
 * Freyr 1.067 by Andrei Fortuna, Winboard Forum, September 15, 2000

=External Links=

Chess Engine

 * Planet Source Code™ | Freyr - A Chess Playing Program by Andrei Fortuna
 * Index of /chess/engines/Jim Ablett/FREYR compiled by Jim Ablett, hosted by Kirill Kryukov
 * Freyr 1.068 64-bit in CCRL 40/4

Misc

 * Freyr from Wikipedia
 * Sword of Freyr from Wikipedia
 * Yngvi-Freyr from Wikipedia
 * Frey (disambiguation) from Wikipedia
 * Freyja from Wikipedia

=References= Up one level