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**[[Home]] * [[Engines]] * PolarChess** || [[image:thecaseofthebipolarchessqueen.jpg link="http://www.flickr.com/photos/29528454@N04/5428134932"]] ||~ || **PolarChess**, a [[WinBoard]] compliant chess engine, written at [[http://toolserver.org/~geohack/geohack.php?pagename=Vads%C3%B8¶ms=70_04_24_N_029_44_59_E_region:NO_type:city|70° 4′ 24″ N]], 3° 30′ 40″ north the [[https://en.wikipedia.org/wiki/Arctic_Circle|Arctic Circle]] in [[https://en.wikipedia.org/wiki/Vads%C3%B8|Vadsø]] <ref>[[http://www.gaisma.com/en/location/vadso.html|Vadsø, Norway - Sunrise, sunset, dawn and dusk times for the whole year - Gaisma]]</ref>, [[https://en.wikipedia.org/wiki/Finnmark|Finnmark]] [[https://en.wikipedia.org/wiki/Counties_of_Norway|country]], [[https://en.wikipedia.org/wiki/Norway|Norway]] , by [[Odd Gunnar Malin]] in [[Cpp|C++]], first released in November 2001 <ref>[[http://wbec-ridderkerk.nl/html/details1/Polar.html|PolarChess]] from [[WBEC|WBEC Ridderkerk]]</ref>. PolarChess, version 1.2 as [[Open Source Engines|open source]], includes the PolarEngine package with [[Search|search]] and [[Evaluation|evaluation]] decoupled from the [[Board Representation|board representation]]. It has a [[0x88]] board, and applies [[Alpha-Beta|alpha-beta]] with [[Transposition Table|transposition table]] and [[Null Move Pruning|null move pruning]] inside an [[Iterative Deepening|iterative deepening]] framework with [[Aspiration Windows|aspiration windows]]. [[Check Extensions|Checks]], [[Passed Pawn Extensions|pawn moves to the 7th rank]], and [[Mate Threat Extensions|mate threatening moves]] are [[Extensions|extended]], [[Killer Heuristic|killer-]] and [[History Heuristic|history heuristic]] help to [[Move Ordering|order moves]]. [[Evaluation]] counts [[Material|material]] aware of the [[Bishop Pair|bishop pair]] and trade bonuses for pieces if ahead and pawns if behind, and positionally considers [[Pawn Structure|pawn structure]] utilizing a [[Pawn Hash Table|pawn hash table]], [[Passed Pawn|passed pawns]], [[Mobility|mobility]], [[Rook on Open File|rook on open file]], [[Bad bishop|bad bishop]], and [[King Safety#PawnShield|pawn shield]] for [[King Safety|king safety]] to name the most important terms. PolarChess played the [[CCT4]] and [[CCT5]] tournaments. || || The case of the bi-polar chess queen <ref>[[http://www.flickr.com/photos/29528454@N04/5428134932|THE CASE OF THE BI-POLAR CHESS QUEEN: A Short Story | Flickr - Fotosharing!]] by [[http://www.flickr.com/photos/huffstutterrobertl/|Robert Huffstutter]]</ref> ||~ ||^ || [[toc]] =Selected Games= [[CCT4]], round 4, [[PolarChess]] - [[Warlord]] <ref>[[http://www.vrichey.de/cct4/|CCT4 - PGN-Download]] hosted by [[Volker Richey]]</ref> <ref>[[http://www.stmintz.com/ccc/index.php?id=208631|PolarChess just beat Warlord]] by [[William H. Rogers]], [[CCC]], January 20, 2002</ref> [[code]] [Event "CCT4"] [Site "Internet Chess Club"] [Date "2002.01.20"] [Round "4"] [White "PolarChess"] [Black "Warlord Beta V1"] [Result "1-0"] 1.e4 Nf6 2.e5 Ne4 3.d3 Nc5 4.d4 Ne6 5.d5 Nc5 6.Qd4 e6 7.d6 cxd6 8.exd6 Qb6 9.Qc3 a5 10.Bf4 f6 11.Na3 e5 12.Nb5 Bxd6 13.Nxd6+ Qxd6 14.Be3 b6 15.Rd1 Qc6 16.Bxc5 bxc5 17.Be2 Bb7 18.Bf3 e4 19.Be2 d5 20.Nh3 Qb6 21.Nf4 d4 22.Qh3 Nd7 23.Ng6 Rg8 24.Qxh7 Qe6 25.b3 Nf8 26.Bb5+ Kf7 27.Qh5 Nxg6 28.Bc4 Qxc4 29.bxc4 Rac8 30.Rb1 Ba8 31.Rb6 Rh8 32.Qf5 Rhe8 33.O-O Ne5 34.Ra6 Kg8 35.Rxa5 e3 36.fxe3 dxe3 37.Re1 Rcd8 38.Qh5 g6 39.Qh4 Rd2 40.Rxe3 Red8 41.Rxc5 Rxg2+ 42.Kf1 Rd1+ 43.Re1 Rxe1+ 44.Qxe1 Rxh2 45.Qb4 Rh1+ 46.Kf2 Rh2+ 47.Kg3 Rg2+ 48.Kh3 Kf7 49.Qa3 Be4 50.Rxe5 fxe5 51.Qe3 Bb7 52.Qxe5 Rxc2 53.Qc7+ Kf6 54.Qxb7 Rc3+ 55.Kg2 Rc2+ 56.Kf3 Rc3+ 57.Ke4 Rxc4+ 58.Kd3 Rh4 59.Qc6+ Kg7 60.Qc7+ Kh6 61.Qe5 Rh3+ 62.Ke4 Rh4+ 63.Kf3 Ra4 64.Qh8+ Kg5 65.Qd8+ Kh6 66.Qf8+ Kh5 67.Qf7 Ra3+ 68.Kf2 Ra4 69.Qd5+ Kh4 70.Qh1+ Kg4 71.Qd1+ 1-0 [[code]] =See also= * [[Amundsen]] * [[Various Classifications#Geography|Geography]] * [[Siberian Chess]] =Forum Posts= * [[http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=35161|PolarChess]] by [[Odd Gunnar Malin]], [[Computer Chess Forums|Winboard Forum]], November 26, 2001 * [[http://www.open-aurec.com/wbforum/viewtopic.php?f=18&t=35265|PolarChess]] by [[Odd Gunnar Malin]], [[Computer Chess Forums|Winboard Forum]], December 19, 2001 =External Links= ==Chess Engine== * [[http://web.archive.org/web/20100922051419/http://home.online.no/~malin/sjakk/|Chess and Data]] - [[https://en.wikipedia.org/wiki/Wayback_Machine|WaybackMachine]] * [[http://wbec-ridderkerk.nl/html/details1/Polar.html|PolarChess]] from [[WBEC|WBEC Ridderkerk]] * [[http://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?match_length=30&print=Details+%28text%29&eng=PolarChess%201.3|PolarChess 1.3]] in [[CCRL|CCRL 40/4]] ==Misc== * [[https://en.wikipedia.org/wiki/Polar|Polar (disambiguation) from Wikipedia]] > [[https://en.wikipedia.org/wiki/Pole_and_polar|Pole and polar from Wikipedia]] > [[https://en.wikipedia.org/wiki/Polar_coordinate_system|Polar coordinate system from Wikipedia]] > [[https://en.wikipedia.org/wiki/Polar_set|Polar set from Wikipedia]] > [[https://en.wikipedia.org/wiki/Yes%E2%80%93no_question|Polar question from Wikipedia]] * [[https://en.wikipedia.org/wiki/Polar_circle|Polar circle from Wikipedia]] * [[https://en.wikipedia.org/wiki/Polaris|Polaris]] * [[https://en.wikipedia.org/wiki/Polar_Star_%28novel%29|Polar Star (novel) from Wikipedia]] * Anne Paceo's Circles - Toundra, [[https://en.wikipedia.org/wiki/Marseille|Marseille]] [[http://www.telerama.fr/festivals-ete/2015/a-marseille-melody-gardot-en-diva-passionnee,129640.php|Jazz des Cinq Continents]], July 21, 2015 , [[https://en.wikipedia.org/wiki/YouTube|YouTube]] Video > [[https://fr.wikipedia.org/wiki/Anne_Paceo|Anne Paceo]], [[Videos#LeilaMartial|Leïla Martial]], [[https://fr.wikipedia.org/wiki/Christophe_Panzani|Christophe Panzani]], [[Videos#TonyPaeleman|Tony Paeleman]] > [[media type="youtube" key="BeyP3UD8Dhk"]] =References= <references /> =What links here?= [[include page="PolarChess" component="backlinks" limit="40" ]] **[[Engines|Up one Level]]**