Purple Haze

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[.jpg) Purple Haze flower [1] Purple Haze,

a free open source chess engine by Vincent Ollivier compliant to the Chess Engine Communication Protocol and distributed under the terms of the GNU General Public License version 3 [2]. Purple Haze uses some features of C++11, so one needs GCC >= 4.6 or Clang >= 3.0 [3] to compile it.

Board Representation

Purple Haze has a 0x88 board representation combined with piece-lists, and utilizes two arrays indexed by 0x88 square relations, containing either direction and boolean information in std::bitset<7> whether a piece type may attack a square [4], both used for lazy or staged move generation concerning legality of hash move and killers.

Search

The PVS implementation [5] uses node type as template parameter, and applies adaptive null move pruning, extended futility pruning, and LMR etc. [6] inside its iterative deepening framework with transposition table.

Evaluation

The evaluation features a material hash table and tapers between opening and endgame piece-square tables [7].

See also#

• Little Wing

Forum Posts#

• MSVC build of Purple Haze by Dann Corbit, CCC, June 20, 2011
• Purple Haze v2.0.2 by Vincent Ollivier, CCC, March 26, 2012
• Purple Haze v2.1.0 by Vincent Ollivier, CCC, November 10, 2012

External Links#

Chess Engine#

• Purple Haze
• · GitHub - vinc/purplehaze: 0x88 chess engine written in C++

Misc#

• Purple Haze (disambiguation) from Wikipedia
• Purple Haze (cannabis) from Wikipedia
• Purple from Wikipedia
• Haze from Wikipedia
• The Jimi Hendrix Experience - Purple Haze, Beat-Club 1967, YouTube Video

line-up: Jimi Hendrix, Mitch Mitchell, Noel Redding

• Nguyên Lê - Purple Haze - Philips Music World Festival 2004, São Paulo, YouTube Video

line-up: Nguyên Lê, Michel Alibo, Cathy Renoir, Francis Lassus

References#

1. ↑ Purple Haze flower, Photo by Hans Roht, May 01, 2010, Purple Haze (cannabis) from Wikipedia, Cannabis (drug) from Wikipedia
2. ↑ purplehaze/README.md at master · vinc/purplehaze · GitHub
3. ↑ Purple Haze v2.0.2 by Vincent Ollivier, CCC, March 26, 2012
4. ↑ github.com/vinc/purplehaze/blob/master/src/board.h
5. ↑ PVS by Edmund Moshammer, CCC, March 12, 2009
6. ↑ github.com/vinc/purplehaze/blob/master/src/search.cpp
7. ↑ github.com/vinc/purplehaze/blob/master/README.md

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