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Created page with "'''Home * Engines * Doctor?''' FILE:Doctor Who logo 1963-1967.png|border|right|thumb| Doctor Who <ref>[https://en.wikipedia.org/wiki/Doctor_Who Doctor Who..."
'''[[Main Page|Home]] * [[Engines]] * Doctor?'''
[[FILE:Doctor Who logo 1963-1967.png|border|right|thumb| Doctor Who <ref>[https://en.wikipedia.org/wiki/Doctor_Who Doctor Who] [https://commons.wikimedia.org/wiki/File:Doctor_Who_logo_1963-1967.png logo used from 1963 to 1967], [https://simple.wikipedia.org/wiki/Cultural_icon Cultural icon from Wikipedia]</ref> ]]
'''Doctor?''',<br/>
is the commercial successor of [[Bobby|Bobby II]] by [[Hans-Joachim Kraas]] and [[Günther Schrüfer]]. It was market by [[ChessBase]] as 16-bit engine in 1995 as analysis engine for [[ChessBase (Database)|ChessBase/Windows 1.0]], and in 1998 as 32-bit add-on engine of the [[Fritz|Fritz 5.32]] package <ref>[http://scleinzell.schachvereine.de/p_spielprogramme/fritz532.shtml Fritz 5.32 - mehr als nur ein Update!] by [[Peter Schreiner]] (German), [http://scleinzell.schachvereine.de/home/news.shtml Schachclub Leinzell]</ref> <ref>[http://www.schachversand.de/d/detail/software/76.html Doctor? 2.0 / Engine MacIntosh] from [[Schachversand Niggemann]]</ref>. Doctor? is written in [[C]] and was therefor available for various hardware platforms and operating systems. According to [[Ingo Althöfer]], who used Doctor? in his triple-brain experiments, it was the first engine which implemented a k-best mode. Doctor?'s strengths were mainly due to [[Strategy|strategy]] and unsual [[Pawn Structure|pawn structures]] in [[Endgame|endgames]].
The engine uses [[Depth#FractionalPlies|fractional plies]] with a [[Depth|depth]] increment in [[Iterative Deepening|iterative deepening]] of 1/3 [[Ply|ply]] <ref>[https://groups.google.com/d/msg/rec.games.chess.computer/wicY4-UeoxM/56IttHZVta4J Re: Doctor module for Fritz/Chessbase?] by [[Ingo Althöfer]], [[Computer Chess Forums|rgcc]], December 08, 1997</ref>.
=Program Characteristics=
<ref>[http://www.ajedrez-de-estilo.com.ar/int/Products/engines/doctor/index.htm Doctor? by Dr. Hans-Joachim Kraas and Dr. Gunther Schrüfer] (as of June 2018, dead link)</ref>
* [[STC-Search]] (solution tree cost oriented search) <ref>[[Günther Schrüfer]] ('''1988'''). ''[http://www.worldcat.org/oclc/246856479&referer=brief_results Minimax-Suchen : Kosten, Qualität und Algorithmen]''. Braunschweig : Technische Universität. (German)</ref>
* Ample chess [[Knowledge|knowledge]] in [[Evaluation Function|evaluation function]] and [[Search|search]] heuristics.
* [[Strategy|Positional]] playing style with [[Tactics|tactical]] surprises.
* Written fully in [[C]]
* Implemented on [[Atari ST]], [[IBM PC|PC]] ([[Unix]], [[Windows|Win3.x, Win95/98, WinNT]]), [[Macintosh|Mac]], [[Sun]], BiiN
=Forum Posts=
* [https://groups.google.com/d/msg/rec.games.chess.computer/wicY4-UeoxM/GLz5-nqGzMIJ Doctor module for Fritz/Chessbase?] by MLK and [[Robert Pawlak|RJP]], [[Computer Chess Forums|rgcc]], December 07, 1997
: [https://groups.google.com/d/msg/rec.games.chess.computer/wicY4-UeoxM/56IttHZVta4J Re: Doctor module for Fritz/Chessbase?] by [[Ingo Althöfer]], [[Computer Chess Forums|rgcc]], December 08, 1997
* [https://groups.google.com/d/msg/rec.games.chess.computer/O91If2-LYQU/Q23IDJ45w78J Doctor! 3.0, # nodes searched, and knowledge versus speed] by Roger, [[Computer Chess Forums|rgcc]], January 29, 1999
* [http://www.talkchess.com/forum/viewtopic.php?t=27268 Doctor 3.0?] by [[Swaminathan Natarajan]], [[CCC]], April 01, 2009
=External Links=
* [https://www.schachversand.de/de/doctor-2-0-engine-macintosh.html Doctor? 2.0 / Engine MacIntosh - Schachprogramm - Software] - [[Schachversand Niggemann]]
* [http://computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?print=Details&each_game=1&eng=Doctor%203.0#Doctor_3_0 Doctor 3.0] in [[CCRL|CCRL 40/4]]
=Refererences=
<references />
'''[[Engines|Up one Level]]'''
[[FILE:Doctor Who logo 1963-1967.png|border|right|thumb| Doctor Who <ref>[https://en.wikipedia.org/wiki/Doctor_Who Doctor Who] [https://commons.wikimedia.org/wiki/File:Doctor_Who_logo_1963-1967.png logo used from 1963 to 1967], [https://simple.wikipedia.org/wiki/Cultural_icon Cultural icon from Wikipedia]</ref> ]]
'''Doctor?''',<br/>
is the commercial successor of [[Bobby|Bobby II]] by [[Hans-Joachim Kraas]] and [[Günther Schrüfer]]. It was market by [[ChessBase]] as 16-bit engine in 1995 as analysis engine for [[ChessBase (Database)|ChessBase/Windows 1.0]], and in 1998 as 32-bit add-on engine of the [[Fritz|Fritz 5.32]] package <ref>[http://scleinzell.schachvereine.de/p_spielprogramme/fritz532.shtml Fritz 5.32 - mehr als nur ein Update!] by [[Peter Schreiner]] (German), [http://scleinzell.schachvereine.de/home/news.shtml Schachclub Leinzell]</ref> <ref>[http://www.schachversand.de/d/detail/software/76.html Doctor? 2.0 / Engine MacIntosh] from [[Schachversand Niggemann]]</ref>. Doctor? is written in [[C]] and was therefor available for various hardware platforms and operating systems. According to [[Ingo Althöfer]], who used Doctor? in his triple-brain experiments, it was the first engine which implemented a k-best mode. Doctor?'s strengths were mainly due to [[Strategy|strategy]] and unsual [[Pawn Structure|pawn structures]] in [[Endgame|endgames]].
The engine uses [[Depth#FractionalPlies|fractional plies]] with a [[Depth|depth]] increment in [[Iterative Deepening|iterative deepening]] of 1/3 [[Ply|ply]] <ref>[https://groups.google.com/d/msg/rec.games.chess.computer/wicY4-UeoxM/56IttHZVta4J Re: Doctor module for Fritz/Chessbase?] by [[Ingo Althöfer]], [[Computer Chess Forums|rgcc]], December 08, 1997</ref>.
=Program Characteristics=
<ref>[http://www.ajedrez-de-estilo.com.ar/int/Products/engines/doctor/index.htm Doctor? by Dr. Hans-Joachim Kraas and Dr. Gunther Schrüfer] (as of June 2018, dead link)</ref>
* [[STC-Search]] (solution tree cost oriented search) <ref>[[Günther Schrüfer]] ('''1988'''). ''[http://www.worldcat.org/oclc/246856479&referer=brief_results Minimax-Suchen : Kosten, Qualität und Algorithmen]''. Braunschweig : Technische Universität. (German)</ref>
* Ample chess [[Knowledge|knowledge]] in [[Evaluation Function|evaluation function]] and [[Search|search]] heuristics.
* [[Strategy|Positional]] playing style with [[Tactics|tactical]] surprises.
* Written fully in [[C]]
* Implemented on [[Atari ST]], [[IBM PC|PC]] ([[Unix]], [[Windows|Win3.x, Win95/98, WinNT]]), [[Macintosh|Mac]], [[Sun]], BiiN
=Forum Posts=
* [https://groups.google.com/d/msg/rec.games.chess.computer/wicY4-UeoxM/GLz5-nqGzMIJ Doctor module for Fritz/Chessbase?] by MLK and [[Robert Pawlak|RJP]], [[Computer Chess Forums|rgcc]], December 07, 1997
: [https://groups.google.com/d/msg/rec.games.chess.computer/wicY4-UeoxM/56IttHZVta4J Re: Doctor module for Fritz/Chessbase?] by [[Ingo Althöfer]], [[Computer Chess Forums|rgcc]], December 08, 1997
* [https://groups.google.com/d/msg/rec.games.chess.computer/O91If2-LYQU/Q23IDJ45w78J Doctor! 3.0, # nodes searched, and knowledge versus speed] by Roger, [[Computer Chess Forums|rgcc]], January 29, 1999
* [http://www.talkchess.com/forum/viewtopic.php?t=27268 Doctor 3.0?] by [[Swaminathan Natarajan]], [[CCC]], April 01, 2009
=External Links=
* [https://www.schachversand.de/de/doctor-2-0-engine-macintosh.html Doctor? 2.0 / Engine MacIntosh - Schachprogramm - Software] - [[Schachversand Niggemann]]
* [http://computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?print=Details&each_game=1&eng=Doctor%203.0#Doctor_3_0 Doctor 3.0] in [[CCRL|CCRL 40/4]]
=Refererences=
<references />
'''[[Engines|Up one Level]]'''
