https://www.chessprogramming.org/index.php?title=Doctor%3F&feed=atom&action=history
Doctor? - Revision history
2024-03-29T00:07:38Z
Revision history for this page on the wiki
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https://www.chessprogramming.org/index.php?title=Doctor%3F&diff=8335&oldid=prev
GerdIsenberg at 19:43, 8 November 2018
2018-11-08T19:43:25Z
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 19:43, 8 November 2018</td>
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GerdIsenberg
https://www.chessprogramming.org/index.php?title=Doctor%3F&diff=8334&oldid=prev
GerdIsenberg at 19:40, 8 November 2018
2018-11-08T19:40:45Z
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</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l9" >Line 9:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>=Program Characteristics=  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>=Program Characteristics=  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><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></div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><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></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* [[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]''. <del class="diffchange diffchange-inline">Braunschweig </del>: <del class="diffchange diffchange-inline">Technische Universität</del>. (German)</ref></div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* [[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]''. <ins class="diffchange diffchange-inline">[https</ins>:<ins class="diffchange diffchange-inline">//en</ins>.<ins class="diffchange diffchange-inline">wikipedia.org/wiki/Technical_University_of_Braunschweig Technical University of Braunschweig] </ins>(German)</ref></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* Ample chess [[Knowledge|knowledge]] in [[Evaluation Function|evaluation function]] and [[Search|search]] heuristics.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* Ample chess [[Knowledge|knowledge]] in [[Evaluation Function|evaluation function]] and [[Search|search]] heuristics.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [[Strategy|Positional]] playing style with [[Tactics|tactical]] surprises.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [[Strategy|Positional]] playing style with [[Tactics|tactical]] surprises.</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* Written <del class="diffchange diffchange-inline">fully </del>in [[C]]</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* Written in [[C]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* Implemented on [[Atari ST]], [[IBM PC|PC]] ([[Unix]], [[Windows|Win3.x, Win95/98, WinNT]]), [[Macintosh|Mac]], [[Sun]], BiiN</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* Implemented on [[Atari ST]], [[IBM PC|PC]] ([[Unix]], [[Windows|Win3.x, Win95/98, WinNT]]), [[Macintosh|Mac]], [[Sun]], BiiN</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>=External Links=</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>=External Links=</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">==Chess Program==</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [https://www.schachversand.de/de/doctor-2-0-engine-macintosh.html Doctor? 2.0 / Engine MacIntosh - Schachprogramm - Software] - [[Schachversand Niggemann]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [https://www.schachversand.de/de/doctor-2-0-engine-macintosh.html Doctor? 2.0 / Engine MacIntosh - Schachprogramm - Software] - [[Schachversand Niggemann]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [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]]</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>* [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]]</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">==Misc==</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* [https://en.wikipedia.org/wiki/Doctor_Who Doctor Who from Wikipedia]</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* [http://tardis.wikia.com/wiki/Douglas_Adams Douglas Adams | Tardis, The Doctor Who Wiki]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>=Refererences=  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>=Refererences=  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><references /></div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div><references /></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''[[Engines|Up one Level]]'''</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''[[Engines|Up one Level]]'''</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:Douglas Adams]]</ins></div></td></tr>
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GerdIsenberg
https://www.chessprogramming.org/index.php?title=Doctor%3F&diff=4736&oldid=prev
GerdIsenberg: 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..."
2018-06-26T09:46:39Z
<p>Created page with "'''<a href="/Main_Page" title="Main Page">Home</a> * <a href="/Engines" title="Engines">Engines</a> * Doctor?''' FILE:Doctor Who logo 1963-1967.png|border|right|thumb| Doctor Who <ref>[https://en.wikipedia.org/wiki/Doctor_Who Doctor Who..."</p>
<p><b>New page</b></p><div>'''[[Main Page|Home]] * [[Engines]] * Doctor?'''<br />
<br />
[[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> ]] <br />
<br />
'''Doctor?''',<br/><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]]. <br />
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>. <br />
<br />
=Program Characteristics= <br />
<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><br />
* [[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><br />
* Ample chess [[Knowledge|knowledge]] in [[Evaluation Function|evaluation function]] and [[Search|search]] heuristics.<br />
* [[Strategy|Positional]] playing style with [[Tactics|tactical]] surprises.<br />
* Written fully in [[C]]<br />
* Implemented on [[Atari ST]], [[IBM PC|PC]] ([[Unix]], [[Windows|Win3.x, Win95/98, WinNT]]), [[Macintosh|Mac]], [[Sun]], BiiN<br />
<br />
=Forum Posts=<br />
* [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<br />
: [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<br />
* [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<br />
* [http://www.talkchess.com/forum/viewtopic.php?t=27268 Doctor 3.0?] by [[Swaminathan Natarajan]], [[CCC]], April 01, 2009<br />
<br />
=External Links=<br />
* [https://www.schachversand.de/de/doctor-2-0-engine-macintosh.html Doctor? 2.0 / Engine MacIntosh - Schachprogramm - Software] - [[Schachversand Niggemann]]<br />
* [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]]<br />
<br />
=Refererences= <br />
<references /><br />
<br />
'''[[Engines|Up one Level]]'''</div>
GerdIsenberg