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Created page with "'''Home * Engines * Freyr''' [[FILE:Freyr by Johannes Gehrts.jpg|border|right|thumb| [https://en.wikipedia.org/wiki/Freyr Freyr] and [https://en.wikipedia.o..."
'''[[Main Page|Home]] * [[Engines]] * Freyr'''
[[FILE:Freyr by Johannes Gehrts.jpg|border|right|thumb| [https://en.wikipedia.org/wiki/Freyr Freyr] and [https://en.wikipedia.org/wiki/Gullinbursti Gullinbursti] <ref>''Freyr'' by [https://en.wikipedia.org/wiki/Johannes_Gehrts Johannes Gehrts]. The god [https://en.wikipedia.org/wiki/Freyr Freyr] stands with his sword and the boar [https://en.wikipedia.org/wiki/Gullinbursti Gullinbursti]. Source: [https://en.wikipedia.org/wiki/Felix_Dahn Felix Dahn], [https://de.wikipedia.org/wiki/Therese_Dahn Therese Dahn] ('''1901'''). ''[https://archive.org/details/walhallgermanisc1888dahn/page/n5 Walhall: Germanische Götter- und Heldensagen. Für Alt und Jung am deutschen Herd]''. [https://en.wikipedia.org/wiki/Breitkopf_%26_H%C3%A4rtel Breitkopf & Härtel], [https://en.wikipedia.org/wiki/Sword_of_Freyr Sword of Freyr from Wikipedia]</ref> ]]
'''Freyr''',<br/>
a [[WinBoard]] compliant [[:Category:Open Source|open source chess engine]] by [[Andrei Fortuna]], written in [[Cpp|C++]], intended as a test ground for various chess algorithms, first released in February 2000.
=Description=
Freyr is a [[Bitboards|bitboard]] engine and uses [[Rotated Bitboards|rotated bitboards]] to determine [[Sliding Piece Attacks|sliding piece attacks]]. The search is [[Principal Variation Search|PVS]] <ref>[https://www.stmintz.com/ccc/index.php?id=102792 A Question on simple Alpha-Beta versus PVS/Negascout] by [[Andrei Fortuna]], [[CCC]], March 21, 2000</ref> with [[Null Move Pruning|null move pruning]] inside an [[Aspiration Windows|aspiration window]] [[Iterative Deepening|iterative deepening]] framework with [[Transposition Table|transposition table]], using several [[Move Ordering|move ordering]] heuristics, such as [[Killer Heuristic|killer]], [[History Heuristic|history]] and [[Countermove Heuristic|countermove]], as well as [[Static Exchange Evaluation|SEE]] to order [[Captures|captures]]. [[Lazy Evaluation|Lazy evaluation]] considers [[Incremental Updates|incremental updated]] [[Material|material-]] and [[Piece-Square Tables|piece-square table]] scores and [[Pawn Hash Table|cached]] [[Pawn Structure|pawn structure]] stuff. [[Evaluation]] further includes [[King Safety|king safety]] and [[Passed Pawn|passed pawns]] as most dominant terms <ref>[http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=3333&lngWId=3 Planet Source Code™ | Freyr - A Chess Playing Program] by [[Andrei Fortuna]]</ref>.
=See also=
* [[Thor's Hammer]]
=Forum Posts=
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=30905 New Winboard Program] by [[Đorđe Vidanović]], [[Computer Chess Forums|Winboard Forum]], February 15, 2000
* [https://www.stmintz.com/ccc/index.php?id=98762 A New Release of my Amateur Chess Engine Freyr] by [[Andrei Fortuna]], [[CCC]], February 22, 2000
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=30992 Freyr 0.960 released] by [[Andrei Fortuna]], [[Computer Chess Forums|Winboard Forum]], February 29, 2000
* [https://www.stmintz.com/ccc/index.php?id=102792 A Question on simple Alpha-Beta versus PVS/Negascout] by [[Andrei Fortuna]], [[CCC]], March 21, 2000 » [[Alpha-Beta]], [[Principal Variation Search]], [[NegaScout]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=31398 Freyr 0.987 Released] by [[Andrei Fortuna]], [[Computer Chess Forums|Winboard Forum]], April 30, 2000
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=31531 Freyr 1.015 Released] by [[Andrei Fortuna]], [[Computer Chess Forums|Winboard Forum]], May 29, 2000
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=31554 Freyr 1.024 sees the daylight] by [[Andrei Fortuna]], [[Computer Chess Forums|Winboard Forum]], June 02, 2000
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=32400 Freyr 1.067] by [[Andrei Fortuna]], [[Computer Chess Forums|Winboard Forum]], September 15, 2000
=External Links=
==Chess Engine==
* [http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=3333&lngWId=3 Planet Source Code™ | Freyr - A Chess Playing Program] by [[Andrei Fortuna]]
* [http://kirr.homeunix.org/chess/engines/Jim%20Ablett/FREYR/ Index of /chess/engines/Jim Ablett/FREYR] compiled by [[Jim Ablett]], hosted by [[Kirill Kryukov]]
* [http://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?match_length=30&print=Details&each_game=1&eng=Freyr%201.068%2064-bit Freyr 1.068 64-bit] in [[CCRL|CCRL 40/4]]
==Misc==
* [https://en.wikipedia.org/wiki/Freyr Freyr from Wikipedia]
* [https://en.wikipedia.org/wiki/Sword_of_Freyr Sword of Freyr from Wikipedia]
* [https://en.wikipedia.org/wiki/Yngvi Yngvi-Freyr from Wikipedia]
* [https://en.wikipedia.org/wiki/Frey_%28disambiguation%29 Frey (disambiguation) from Wikipedia]
* [https://en.wikipedia.org/wiki/Freyja Freyja from Wikipedia]
=References=
<references />
'''[[Engines|Up one level]]'''
[[Category:Open Source]]
[[Category:WinBoard]]
[[Category:Mythology]]
[[FILE:Freyr by Johannes Gehrts.jpg|border|right|thumb| [https://en.wikipedia.org/wiki/Freyr Freyr] and [https://en.wikipedia.org/wiki/Gullinbursti Gullinbursti] <ref>''Freyr'' by [https://en.wikipedia.org/wiki/Johannes_Gehrts Johannes Gehrts]. The god [https://en.wikipedia.org/wiki/Freyr Freyr] stands with his sword and the boar [https://en.wikipedia.org/wiki/Gullinbursti Gullinbursti]. Source: [https://en.wikipedia.org/wiki/Felix_Dahn Felix Dahn], [https://de.wikipedia.org/wiki/Therese_Dahn Therese Dahn] ('''1901'''). ''[https://archive.org/details/walhallgermanisc1888dahn/page/n5 Walhall: Germanische Götter- und Heldensagen. Für Alt und Jung am deutschen Herd]''. [https://en.wikipedia.org/wiki/Breitkopf_%26_H%C3%A4rtel Breitkopf & Härtel], [https://en.wikipedia.org/wiki/Sword_of_Freyr Sword of Freyr from Wikipedia]</ref> ]]
'''Freyr''',<br/>
a [[WinBoard]] compliant [[:Category:Open Source|open source chess engine]] by [[Andrei Fortuna]], written in [[Cpp|C++]], intended as a test ground for various chess algorithms, first released in February 2000.
=Description=
Freyr is a [[Bitboards|bitboard]] engine and uses [[Rotated Bitboards|rotated bitboards]] to determine [[Sliding Piece Attacks|sliding piece attacks]]. The search is [[Principal Variation Search|PVS]] <ref>[https://www.stmintz.com/ccc/index.php?id=102792 A Question on simple Alpha-Beta versus PVS/Negascout] by [[Andrei Fortuna]], [[CCC]], March 21, 2000</ref> with [[Null Move Pruning|null move pruning]] inside an [[Aspiration Windows|aspiration window]] [[Iterative Deepening|iterative deepening]] framework with [[Transposition Table|transposition table]], using several [[Move Ordering|move ordering]] heuristics, such as [[Killer Heuristic|killer]], [[History Heuristic|history]] and [[Countermove Heuristic|countermove]], as well as [[Static Exchange Evaluation|SEE]] to order [[Captures|captures]]. [[Lazy Evaluation|Lazy evaluation]] considers [[Incremental Updates|incremental updated]] [[Material|material-]] and [[Piece-Square Tables|piece-square table]] scores and [[Pawn Hash Table|cached]] [[Pawn Structure|pawn structure]] stuff. [[Evaluation]] further includes [[King Safety|king safety]] and [[Passed Pawn|passed pawns]] as most dominant terms <ref>[http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=3333&lngWId=3 Planet Source Code™ | Freyr - A Chess Playing Program] by [[Andrei Fortuna]]</ref>.
=See also=
* [[Thor's Hammer]]
=Forum Posts=
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=30905 New Winboard Program] by [[Đorđe Vidanović]], [[Computer Chess Forums|Winboard Forum]], February 15, 2000
* [https://www.stmintz.com/ccc/index.php?id=98762 A New Release of my Amateur Chess Engine Freyr] by [[Andrei Fortuna]], [[CCC]], February 22, 2000
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=30992 Freyr 0.960 released] by [[Andrei Fortuna]], [[Computer Chess Forums|Winboard Forum]], February 29, 2000
* [https://www.stmintz.com/ccc/index.php?id=102792 A Question on simple Alpha-Beta versus PVS/Negascout] by [[Andrei Fortuna]], [[CCC]], March 21, 2000 » [[Alpha-Beta]], [[Principal Variation Search]], [[NegaScout]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=31398 Freyr 0.987 Released] by [[Andrei Fortuna]], [[Computer Chess Forums|Winboard Forum]], April 30, 2000
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=31531 Freyr 1.015 Released] by [[Andrei Fortuna]], [[Computer Chess Forums|Winboard Forum]], May 29, 2000
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=31554 Freyr 1.024 sees the daylight] by [[Andrei Fortuna]], [[Computer Chess Forums|Winboard Forum]], June 02, 2000
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=32400 Freyr 1.067] by [[Andrei Fortuna]], [[Computer Chess Forums|Winboard Forum]], September 15, 2000
=External Links=
==Chess Engine==
* [http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=3333&lngWId=3 Planet Source Code™ | Freyr - A Chess Playing Program] by [[Andrei Fortuna]]
* [http://kirr.homeunix.org/chess/engines/Jim%20Ablett/FREYR/ Index of /chess/engines/Jim Ablett/FREYR] compiled by [[Jim Ablett]], hosted by [[Kirill Kryukov]]
* [http://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?match_length=30&print=Details&each_game=1&eng=Freyr%201.068%2064-bit Freyr 1.068 64-bit] in [[CCRL|CCRL 40/4]]
==Misc==
* [https://en.wikipedia.org/wiki/Freyr Freyr from Wikipedia]
* [https://en.wikipedia.org/wiki/Sword_of_Freyr Sword of Freyr from Wikipedia]
* [https://en.wikipedia.org/wiki/Yngvi Yngvi-Freyr from Wikipedia]
* [https://en.wikipedia.org/wiki/Frey_%28disambiguation%29 Frey (disambiguation) from Wikipedia]
* [https://en.wikipedia.org/wiki/Freyja Freyja from Wikipedia]
=References=
<references />
'''[[Engines|Up one level]]'''
[[Category:Open Source]]
[[Category:WinBoard]]
[[Category:Mythology]]
