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a general bitboard technique to determine not only sliding piece attacks, but also [[King Pattern#KingAttacks|king]] and [[Knight Pattern#KnightAttacks|knight attacks]]. The technique was introduced by [[Fabien Letouzey]] within his first release of the [[:Category:Open Source Engines|open source engine]] [[Senpai|Senpai 1.0]] in March 2014 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=51637 Senpai 1.0 (new engine)] by [[Fabien Letouzey]], [[CCC]], March 17, 2014</ref> <ref>[http://www.chessprogramming.net/senpai/ Senpai Chess Engine - Computer Chess Programming] hosted by [[Steve Maughan]]</ref>, but already devised in the mid 2000s, and applied in Fabien's private bitboard engine [[Chess-64]] <ref>Personal communication with [[Fabien Letouzey]], March 20, 2014</ref>. He found it simple and elegant with the endgame in mind <ref>[http://www.talkchess.com/forum/viewtopic.php?t=51637&start=26 Re: Senpai 1.0 (new engine)] by [[Fabien Letouzey]], [[CCC]], March 17, 2014</ref>, and dubbed it "blocker loop", a term already coined by [[Fritz Reul]] in the context of his [[Vector Attacks#NewArchitecture|non bitboard architecture]] <ref>[[Fritz Reul]] ('''2009'''). ''New Architectures in Computer Chess''. Ph.D. Thesis, ''Chapter 2 Non-Bitboard Architectures''.</ref>, thus the editor's proposal of "Blockers and Beyond" <ref>[http://www.talkchess.com/forum/viewtopic.php?t=51637&start=39 Re: Senpai 1.0 (new engine)] by [[Gerd Isenberg]], [[CCC]], March 17, 2014</ref> .

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