Difference between revisions of "Search Explosion"
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[[FILE:The Scream.jpg|border|right|thumb| | [[FILE:The Scream.jpg|border|right|thumb| | ||
| − | link=http://en.wikipedia.org/wiki/1883_eruption_of_Krakatoa|[[ | + | link=http://en.wikipedia.org/wiki/1883_eruption_of_Krakatoa|[[:Category:Edvard Munch|Edvard Munch]] - [https://en.wikipedia.org/wiki/The_Scream The Scream]<ref>[[:Category:Edvard Munch|Edvard Munch]] - One of several versions of the painting [https://en.wikipedia.org/wiki/The_Scream The Scream] (or The Cry), [https://en.wikipedia.org/wiki/National_Gallery_%28Norway%29 National Gallery], 1893, [https://en.wikipedia.org/wiki/Oslo Oslo], [https://en.wikipedia.org/wiki/Norway Norway], [http://www.ibiblio.org/wm/paint/auth/munch/ WebMuseum: Munch, Edvard] - Among theories advanced to account for the reddish sky in the background is the artist's memory of the effects of the powerful volcanic [https://en.wikipedia.org/wiki/1883_eruption_of_Krakatoa eruption of Krakatoa], which deeply tinted sunset skies red in parts of the Western hemisphere for months during 1883 and 1884, about a decade before Munch painted The Scream. This explanation has been disputed by scholars, who note that Munch was an expressive painter and was not primarily interested in literal renderings of what he had seen. </ref> ]] |
A '''Search Explosion''' or node count explosion refers to a huge [[Branching Factor#EffectiveBranchingFactor|effective branching factor]] in [[Iterative Deepening|iterative deepening]], most often caused by [[Move Ordering|move ordering]] suddenly becomes worse due to new refutations found at higher depth, by re-searching the [[Root|root]] after [[Aspiration Windows|aspiration window]] [[Fail-High|fail-high]] or [[Fail-Low|fail-low]], and/or enabling too many [[Extensions|extensions]] and [[Check|checks]] in [[Quiescence Search|quiescence search]]. | A '''Search Explosion''' or node count explosion refers to a huge [[Branching Factor#EffectiveBranchingFactor|effective branching factor]] in [[Iterative Deepening|iterative deepening]], most often caused by [[Move Ordering|move ordering]] suddenly becomes worse due to new refutations found at higher depth, by re-searching the [[Root|root]] after [[Aspiration Windows|aspiration window]] [[Fail-High|fail-high]] or [[Fail-Low|fail-low]], and/or enabling too many [[Extensions|extensions]] and [[Check|checks]] in [[Quiescence Search|quiescence search]]. | ||
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* [https://en.wikipedia.org/wiki/The_Great_Explosion The Great Explosion from Wikipedia] | * [https://en.wikipedia.org/wiki/The_Great_Explosion The Great Explosion from Wikipedia] | ||
* The Jazz Explosion - [https://en.wikipedia.org/wiki/Goodbye_Pork_Pie_Hat Goodbye Pork Pie Hat], live at [https://en.wikipedia.org/wiki/The_Chance The Chance], [https://en.wikipedia.org/wiki/Poughkeepsie,_New_York Poughkeepsie, NY], February 05, 1989, various clips, [https://en.wikipedia.org/wiki/YouTube YouTube] Video | * The Jazz Explosion - [https://en.wikipedia.org/wiki/Goodbye_Pork_Pie_Hat Goodbye Pork Pie Hat], live at [https://en.wikipedia.org/wiki/The_Chance The Chance], [https://en.wikipedia.org/wiki/Poughkeepsie,_New_York Poughkeepsie, NY], February 05, 1989, various clips, [https://en.wikipedia.org/wiki/YouTube YouTube] Video | ||
| − | : [[ | + | : [[:Category:Stanley Clarke|Stanley Clarke]], [[:Category:Allan Holdsworth|Allan Holdsworth]], [[:Category:Randy Brecker|Randy Brecker]], [https://en.wikipedia.org/wiki/Bernard_Wright Bernard Wright], [https://en.wikipedia.org/wiki/Steve_Smith_%28musician%29 Steve Smith] - dedicated to [https://en.wikipedia.org/wiki/Charles_Mingus Charles Mingus] and [[:Category:Jaco Pastorius|Jaco Pastorius]] |
: {{#evu:https://www.youtube.com/watch?v=q21KNH9hXwQ|alignment=left|valignment=top}} | : {{#evu:https://www.youtube.com/watch?v=q21KNH9hXwQ|alignment=left|valignment=top}} | ||
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'''[[Search|Up one Level]]''' | '''[[Search|Up one Level]]''' | ||
| + | [[Category:Edvard Munch]] | ||
| + | [[Category:Randy Brecker]] | ||
| + | [[Category:Stanley Clarke]] | ||
| + | [[Category:Allan Holdsworth]] | ||
| + | [[Category:Jaco Pastorius]] | ||
Revision as of 22:31, 29 June 2018
Home * Search * Search Explosion
A Search Explosion or node count explosion refers to a huge effective branching factor in iterative deepening, most often caused by move ordering suddenly becomes worse due to new refutations found at higher depth, by re-searching the root after aspiration window fail-high or fail-low, and/or enabling too many extensions and checks in quiescence search.
Contents
See also
- Check Extensions
- Extensions
- Mate Threat Extensions
- Odd-Even Effect
- Quiescence Search
- Search Instability
- Time Management
Leonid's Positions
Chess positions posted by Leonid Liberman in CCC let many engines "explode" [2]
♛ ♚ ♛ ♞♛♞ ♝ ♞ ♙ ♞ ♝ ♜♞♜ ♕ ♘♕ ♕♘ ♕ ♕ ♗ ♖♕♖ ♗ ♕ ♔ ♕ |
q2k2q1/2nqn2b/1n1P1n1b/2rnr2Q/1NQ1QN1Q/3Q3B/2RQR2B/Q2K2Q1 w - - [3]
Forum Posts
2000 ...
- Explosion in WAC 102 by David Rasmussen, CCC, January 11, 2002
- No explosions by Matthias Gemuh, CCC, January 11, 2002
- Threat Extension and Tree Explosion by Steve Maughan, CCC, May 23, 2002
- Quiescence Explosion by David Rasmussen, CCC, November 26, 2002
- More Explosion by David Rasmussen, CCC, November 26, 2002
- Quiescent Explosion by macaroni, CCC, June 26, 2003
- quiesce node explosion by Mike Siler, CCC, January 24, 2004
- check extention explosion by Aivaras Juzvikas, CCC, April 03, 2004
2005 ...
- node explosion by David Dahlem, CCC, August 22, 2005
- Node count explosion by Mridul Muralidharan, CCC, September 03, 2005
- Quiescence Search Explosions by Mike Leany, CCC, April 18, 2008
2010 ...
- Problem with exploding tree because of extensions by Oliver Brausch, CCC, January 05, 2010 » Extensions
- Avoiding qsearch explosion by Marco Costalba, CCC, January 29, 2010 » Quiescence Search
2015 ...
- Quiescence node explosion by sandermvdb, OpenChess Forum, June 01, 2016 » Quiescence Search
- Q search explosion by Colin Jenkins, CCC, March 30, 2017 » Quiescence Search
External Links
- Exponential growth from Wikipedia
- The Great Explosion from Wikipedia
- The Jazz Explosion - Goodbye Pork Pie Hat, live at The Chance, Poughkeepsie, NY, February 05, 1989, various clips, YouTube Video
- Stanley Clarke, Allan Holdsworth, Randy Brecker, Bernard Wright, Steve Smith - dedicated to Charles Mingus and Jaco Pastorius
References
- ↑ Edvard Munch - One of several versions of the painting The Scream (or The Cry), National Gallery, 1893, Oslo, Norway, WebMuseum: Munch, Edvard - Among theories advanced to account for the reddish sky in the background is the artist's memory of the effects of the powerful volcanic eruption of Krakatoa, which deeply tinted sunset skies red in parts of the Western hemisphere for months during 1883 and 1884, about a decade before Munch painted The Scream. This explanation has been disputed by scholars, who note that Munch was an expressive painter and was not primarily interested in literal renderings of what he had seen.
- ↑ Remember Leonid Liberman (author of LLCHESS)? by Dann Corbit, CCC, May 23, 2015
- ↑ One mate to solve... by Leonid, CCC, May 30, 2001
