This is a temporary, read-only recovery of the chessprogrammingwiki while a longer-term plan is worked out. Editing is not possible right now, but will be again soon.
Chess Programming Wiki All pages Other namespaces

Freyr

Home * Engines * Freyr

Freyr and Gullinbursti 1Freyr and Gullinbursti 1

  1. Freyr by Johannes Gehrts. The god Freyr stands with his sword and the boar Gullinbursti. Source: Felix Dahn, Therese Dahn (1901). Walhall: Germanische Götter- und Heldensagen. Für Alt und Jung am deutschen Herd. Breitkopf & Härtel, Sword of Freyr from Wikipedia↩︎

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.

Contents
  1. Description
  2. See also
  3. Forum Posts
  4. External Links
    1. Chess Engine
    2. Misc
  5. References

Description

Freyr is a bitboard engine and uses rotated bitboards to determine sliding piece attacks. The search is PVS 1 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 2.

See also

Forum Posts

Chess Engine

Misc

References

Up one level

  1. A Question on simple Alpha-Beta versus PVS/Negascout by Andrei Fortuna, CCC, March 21, 2000↩︎

  2. Planet Source Code™ | Freyr - A Chess Playing Program by Andrei Fortuna↩︎

Categories: Open Source · WinBoard · Windows · PC · X86 · X64 · Mythology

What links here

Contributors: GerdIsenberg.