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'''[[Main Page|Home]] * [[Engines]] * CHEKMO-II'''
[[FILE:checkmo-II.jpg|border|right|thumb|link=https://www.youtube.com/watch?time_continue=7&v=Rp4HIC1crS0| CHEKMO-II' <ref>Image clipped from the [https://www.youtube.com/watch?time_continue=7&v=Rp4HIC1crS0 video] from [http://members.aon.at/nkehrer/pdp8.html Norbert's Emulators | The Atari PDP-8 Emulator | b) Chess program CHEKMO-II]</ref> ]]
'''CHEKMO-II''', (CheckMo-II)
the ''classical'' chess program for the [[PDP-8]], written in the 70s by [[Digital Equipment Corporation]] instructor [[John E. Comeau]] in PAL-8, the PDP-8 [[Assembly|assembly]].
=Abstract=
<ref>[http://www.bitsavers.org/pdf/dec/decus/programCatalogs/DECUS_Catalog_PDP-8_Aug78.pdf DECUS Program Library PDP-8 Catalog 1978] (pdf)</ref> <ref>[http://www.pdp8.net/games/chess.shtml PDP-8 Chess (CHEKMO-II) Instructions]</ref>:
CHEKMO-II is a chess playing program which will run on any PDP-8 family computer. The program will play either the white pieces or the black pieces, and will play and accept all classes of legal moves, including [[Castling|castling]] both short and long, [[En passant|en passant]] pawn captures, and [[Promotions|pawn promoting moves]] to any legal promotion piece. The program prints out its moves in [[Algebraic Chess Notation|Algebraic Notation]], and [[Entering Moves|accepts moves]] using Algebraic Notation. Included in the command structure of the program are commands which allow you to input board positions using [[Forsyth-Edwards Notation|Forsyth Notation]], and get a printout of the board at your terminal.
=Known Deficiencies=
<ref>[http://www.pdp8.net/games/chess.shtml PDP-8 Chess (CHEKMO-II) Instructions]</ref>
CHEKMO-II has been programmed to use the same strategy [[Game Phases|throughout the game]]. This strategy has been optimized for good play in the [[Middlegame]], and [[Opening]]. As a result CHEKMO-II plays poor moves in some [[Endgame]] positions.
If either the white side or the black side becomes significantly more powerful than the other (about 4 queens) CHEKMO-II may play some strange, but legal moves. This is caused by overflow in an internal evaluator routine.
=See also=
* [[QCHESS]]
=Forum Posts=
* [http://groups.google.com/group/alt.sys.pdp8/msg/9b7216d805221f92 More PDP-8 Software Donated to the RICM] by Klemens Krause, [http://groups.google.com/group/alt.sys.pdp8/topics alt.sys.pdp8], July 5, 2011
=External Links=
* [http://www.pdp8.net/games/chess.shtml PDP-8 Chess (CHEKMO-II) Instructions] <ref>[http://www.technikum29.de/de/lernprojekte/schach/Chekmo%20II%20%28deutsch,%20ungekuerzt%29.pdf CHEKMO-II German manual] (pdf)</ref>
* [http://members.aon.at/nkehrer/pdp8.html Norbert's Emulators | The Atari PDP-8 Emulator | b) Chess program CHEKMO-II]
* [http://web.archive.org/web/20071221115817/http://classicchess.googlepages.com/Chess.htm Classic Computer Chess - ... The programs of yesteryear] by [[Carey Bloodworth|Carey]], hosted by the [https://en.wikipedia.org/wiki/Internet_Archive Internet Archive] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=56938&start=2 Re: Old programs CHAOS and USC] by [[Dann Corbit]], [[CCC]], July 11, 2015</ref>
* <span id="PDP8"></span>[[PDP-8]] - Presentation No. 3, [https://en.wikipedia.org/wiki/The_National_Museum_of_Computing The National Museum of Computing], [https://en.wikipedia.org/wiki/YouTube YouTube] Video
: {{#evu:https://www.youtube.com/watch?v=OyDufWHsNVE|alignment=left|valignment=top}}
=References=
<references />
'''[[Engines|Up one level]]'''
[[FILE:checkmo-II.jpg|border|right|thumb|link=https://www.youtube.com/watch?time_continue=7&v=Rp4HIC1crS0| CHEKMO-II' <ref>Image clipped from the [https://www.youtube.com/watch?time_continue=7&v=Rp4HIC1crS0 video] from [http://members.aon.at/nkehrer/pdp8.html Norbert's Emulators | The Atari PDP-8 Emulator | b) Chess program CHEKMO-II]</ref> ]]
'''CHEKMO-II''', (CheckMo-II)
the ''classical'' chess program for the [[PDP-8]], written in the 70s by [[Digital Equipment Corporation]] instructor [[John E. Comeau]] in PAL-8, the PDP-8 [[Assembly|assembly]].
=Abstract=
<ref>[http://www.bitsavers.org/pdf/dec/decus/programCatalogs/DECUS_Catalog_PDP-8_Aug78.pdf DECUS Program Library PDP-8 Catalog 1978] (pdf)</ref> <ref>[http://www.pdp8.net/games/chess.shtml PDP-8 Chess (CHEKMO-II) Instructions]</ref>:
CHEKMO-II is a chess playing program which will run on any PDP-8 family computer. The program will play either the white pieces or the black pieces, and will play and accept all classes of legal moves, including [[Castling|castling]] both short and long, [[En passant|en passant]] pawn captures, and [[Promotions|pawn promoting moves]] to any legal promotion piece. The program prints out its moves in [[Algebraic Chess Notation|Algebraic Notation]], and [[Entering Moves|accepts moves]] using Algebraic Notation. Included in the command structure of the program are commands which allow you to input board positions using [[Forsyth-Edwards Notation|Forsyth Notation]], and get a printout of the board at your terminal.
=Known Deficiencies=
<ref>[http://www.pdp8.net/games/chess.shtml PDP-8 Chess (CHEKMO-II) Instructions]</ref>
CHEKMO-II has been programmed to use the same strategy [[Game Phases|throughout the game]]. This strategy has been optimized for good play in the [[Middlegame]], and [[Opening]]. As a result CHEKMO-II plays poor moves in some [[Endgame]] positions.
If either the white side or the black side becomes significantly more powerful than the other (about 4 queens) CHEKMO-II may play some strange, but legal moves. This is caused by overflow in an internal evaluator routine.
=See also=
* [[QCHESS]]
=Forum Posts=
* [http://groups.google.com/group/alt.sys.pdp8/msg/9b7216d805221f92 More PDP-8 Software Donated to the RICM] by Klemens Krause, [http://groups.google.com/group/alt.sys.pdp8/topics alt.sys.pdp8], July 5, 2011
=External Links=
* [http://www.pdp8.net/games/chess.shtml PDP-8 Chess (CHEKMO-II) Instructions] <ref>[http://www.technikum29.de/de/lernprojekte/schach/Chekmo%20II%20%28deutsch,%20ungekuerzt%29.pdf CHEKMO-II German manual] (pdf)</ref>
* [http://members.aon.at/nkehrer/pdp8.html Norbert's Emulators | The Atari PDP-8 Emulator | b) Chess program CHEKMO-II]
* [http://web.archive.org/web/20071221115817/http://classicchess.googlepages.com/Chess.htm Classic Computer Chess - ... The programs of yesteryear] by [[Carey Bloodworth|Carey]], hosted by the [https://en.wikipedia.org/wiki/Internet_Archive Internet Archive] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=56938&start=2 Re: Old programs CHAOS and USC] by [[Dann Corbit]], [[CCC]], July 11, 2015</ref>
* <span id="PDP8"></span>[[PDP-8]] - Presentation No. 3, [https://en.wikipedia.org/wiki/The_National_Museum_of_Computing The National Museum of Computing], [https://en.wikipedia.org/wiki/YouTube YouTube] Video
: {{#evu:https://www.youtube.com/watch?v=OyDufWHsNVE|alignment=left|valignment=top}}
=References=
<references />
'''[[Engines|Up one level]]'''
