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'''[[Main Page|Home]] * [[Tournaments and Matches|Tournaments]] * [[ACM North American Computer Chess Championship]] * ACM 1981'''
'''[[ACM 1980|< Prev]] [[ACM 1982|Next >]]'''
[[FILE:Westin Bonaventure Hotel.jpg|border|right|thumb| Westin Bonaventure Hotel <ref>[https://commons.wikimedia.org/wiki/File:Westin_Bonaventure_Hotel.jpg Westin Bonaventure Hotel] designed by [[Arts#Portman|John Portman]] - as seen from the platform of [https://en.wikipedia.org/wiki/Citigroup_Center_%28Los_Angeles%29 444 S. Flower Building], [https://en.wikipedia.org/wiki/Downtown_Los_Angeles Downtown Los Angeles], Photo by [https://en.wikipedia.org/wiki/User:Geographer Geographer], December 31, 2006, [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons], [https://en.wikipedia.org/wiki/Westin_Bonaventure_Hotel Westin Bonaventure Hotel from Wikipedia]</ref> ]]
The [[ACM|ACM's]] '''Twelfth North American Computer Chess Championship''' (NACCC) was held from November 8 to 11, [[Timeline#1981|1981]] at the [https://en.wikipedia.org/wiki/Westin_Bonaventure_Hotel Bonaventure Hotel], [https://en.wikipedia.org/wiki/Los_Angeles%2C_California Los Angeles], [https://en.wikipedia.org/wiki/California California], USA <ref>[[Ben Mittman]] ('''1981'''). ''Tournament Announcement - ACM Tournament in Los Angeles''. [[ICGA Journal#4_1|ICCA Newletter, Vol. 4, No. 1]]</ref> .
[[Michael Valvo|Mike Valvo]] acted as Tournament Director, replacing [[David Levy]], who previously served in that capacity and was expected to enter his [[Philidor|own program]]. Tournament guests were ''Shelby Lyman'' <ref>[http://buffalonews.com/2016/05/07/chess-by-shelby-lyman/ Chess by Shelby Lyman], May 7, 2016 » [https://chessdailynews.com/the-chess-tech-evolution/ Susan Polgar Global Chess Daily News and Information - The Chess Tech Evolution]</ref>, chess commentator for [https://en.wikipedia.org/wiki/WNET WNET's] television chess shows and [https://en.wikipedia.org/wiki/Master_of_ceremonies emcee] for the [https://en.wikipedia.org/wiki/World_Chess_Championship_1972 Fisher-Spassky World Championship Match] in 1972 <ref>[http://en.chessbase.com/post/the-man-behind-the-fischer-spaky-show The man behind the Fischer-Spassky show], [[ChessBase|ChessBase News]], January 03, 2003</ref> , and [https://en.wikipedia.org/wiki/Isaac_Kashdan Isaac Kashdan], Chess Editor for the [https://en.wikipedia.org/wiki/Los_Angeles_Times Los Angeles Times]. A computer chess panel discussion and short paper presentation was part of the technical program <ref>[http://www.computer.org/csdl/mags/co/1981/08/01667479.pdf AdvanceProgram ACM 1981, November 9-11, 1981 Bonaventure Hotel, Los Angeles, California] (pdf)</ref> .
=Final Standing=
<ref>[http://www.csvn.nl/index.php/historie/computer-computer/94-acm-1981 ACM 1981] [[CSVN]] site</ref>
{| class="wikitable"
|-
! #
! Program
! CC
! 1
! 2
! 3
! 4
! P
! SOS
! SoDOS
|-
! 1
| style="text-align:left;" | [[Belle]]
! US
| style="text-align:right;" | 7w1
| style="text-align:right;" | 9b1
| style="text-align:right;" | 2w½
| style="text-align:right;" | [[ACM 1981#R4|3b1]]
! 3½
| style="text-align:center;" | 10
| style="text-align:center;" | 8½
|-
! 2
| style="text-align:left;" | [[Nuchess]]
! US
| style="text-align:right;" | 10b1
| style="text-align:right;" | 4w1
| style="text-align:right;" | 1b½
| style="text-align:right;" | 5w½
! 3
| style="text-align:center;" | 11
| style="text-align:center;" | 8
|-
! 3
| style="text-align:left;" | [[Cray Blitz]]
! US
| style="text-align:right;" | 6b1
| style="text-align:right;" | 5w1
| style="text-align:right;" | 12b1
| style="text-align:right;" | [[ACM 1981#R4|1w0]]
! 3
| style="text-align:center;" | 10
| style="text-align:center;" | 6½
|-
! 4
| style="text-align:left;" | [[Bebe]]
! US
| style="text-align:right;" | 11w1
| style="text-align:right;" | 2b0
| style="text-align:right;" | 14b1
| style="text-align:right;" | 7b1
! 3
| style="text-align:center;" | 7½
| style="text-align:center;" | 4½
|-
! 5
| style="text-align:left;" | [[Duchess]]
! US
| style="text-align:right;" | 15w1
| style="text-align:right;" | 3b0
| style="text-align:right;" | 8w1
| style="text-align:right;" | 2b½
! 2½
| style="text-align:center;" | 9
| style="text-align:center;" | 4½
|-
! 6
| style="text-align:left;" | [[Philidor]]
! GB
| style="text-align:right;" | 3w0
| style="text-align:right;" | 15b1
| style="text-align:right;" | 9w1
| style="text-align:right;" | 8b½
! 2½
| style="text-align:center;" | 8
| style="text-align:center;" | 4
|-
! 7
| style="text-align:left;" | [[Ostrich]]
! CA
| style="text-align:right;" | 1b0
| style="text-align:right;" | 16w1
| style="text-align:right;" | 11b1
| style="text-align:right;" | 4w0
! 2
| style="text-align:center;" | 8
| style="text-align:center;" | 1½
|-
! 8
| style="text-align:left;" | [[Chess Challenger|Chess Challenger X]]
! US
| style="text-align:right;" | 14b1
| style="text-align:right;" | 12w½
| style="text-align:right;" | 5b0
| style="text-align:right;" | 6w½
! 2
| style="text-align:center;" | 7½
| style="text-align:center;" | 3
|-
! 9
| style="text-align:left;" | [[L'Excentrique]]
! CA
| style="text-align:right;" | 16b1
| style="text-align:right;" | 1w0
| style="text-align:right;" | 6b0
| style="text-align:right;" | 12w1
! 2
| style="text-align:center;" | 7½
| style="text-align:center;" | 1½
|-
! 10
| style="text-align:left;" | [[MyChess]]
! US
| style="text-align:right;" | 2w0
| style="text-align:right;" | 11b0
| style="text-align:right;" | 15w1
| style="text-align:right;" | 14w1
! 2
| style="text-align:center;" | 6½
| style="text-align:center;" | 2
|-
! 11
| style="text-align:left;" | [[Cube|Cube 2.1]]
! US
| style="text-align:right;" | 4b0
| style="text-align:right;" | 10w1
| style="text-align:right;" | 7w0
| style="text-align:right;" | 13b½
! 1½
| style="text-align:center;" | 8½
| style="text-align:center;" | 2¾
|-
! 12
| style="text-align:left;" | [[CHAOS]]
! US
| style="text-align:right;" | 13w1
| style="text-align:right;" | 8b½
| style="text-align:right;" | 3w0
| style="text-align:right;" | 9b0
! 1½
| style="text-align:center;" | 8½
| style="text-align:center;" | 2½
|-
! 13
| style="text-align:left;" | [[Schach|Schach 2.5]]
! DE
| style="text-align:right;" | 12b0
| style="text-align:right;" | 14w0
| style="text-align:right;" | 16b1
| style="text-align:right;" | 11w½
! 1½
| style="text-align:center;" | 4
| style="text-align:center;" | ¾
|-
! 14
| style="text-align:left;" | [[Chaturanga]]
! US
| style="text-align:right;" | 8w0
| style="text-align:right;" | 13b1
| style="text-align:right;" | 4w0
| style="text-align:right;" | 10b0
! 1
| style="text-align:center;" | 8½
| style="text-align:center;" | 1½
|-
! 15
| style="text-align:left;" | [[Awit]]
! CA
| style="text-align:right;" | 5b0
| style="text-align:right;" | 6w0
| style="text-align:right;" | 10b0
| style="text-align:right;" | 16w1
! 1
| style="text-align:center;" | 7
| style="text-align:center;" | 0
|-
! 16
| style="text-align:left;" | [[Prodigy]]
! CA
| style="text-align:right;" | 9w0
| style="text-align:right;" | 7b0
| style="text-align:right;" | 13w0
| style="text-align:right;" | 15b0
! 0
| style="text-align:center;" | 6½
| style="text-align:center;" | 0
|}
* [https://en.wikipedia.org/wiki/ISO_3166-1 CC Country Codes]
* SOS: [https://en.wikipedia.org/wiki/Buchholz_system Sum of Opponent Scores]
* SoDOS: [https://en.wikipedia.org/wiki/Neustadtl_score Sum of Defeated Opponent Scores]
=Participants=
<ref>[[Ben Mittman]] ('''1981'''). ''Twelfth ACM North American Computer Chess Championship''. [[ICGA Journal#4_3|ICCA Newletter, Vol. 4, No. 3]]</ref>
{| class="wikitable"
|-
! Program
! CC
! Team
! Hardware
! Language
|-
| style="text-align:left;" | [[Awit]]
! CA
| [[Tony Marsland]]
| [[AMDAHL 470|AMDAHL 470V/7]]
| [[Algol|Algol-W]]
|-
| style="text-align:left;" | [[Bebe]]
! US
| [[Tony Scherzer]]
| [https://en.wikipedia.org/wiki/Bit_slicing Bit Slice] Chess hardware
| [[Assembly]]
|-
| style="text-align:left;" | [[Belle]]
! US
| [[Ken Thompson]], [[Joe Condon]]
| [[PDP-11|PDP-11/23]], [https://en.wikipedia.org/wiki/LSI-11#LSI-11 LSI-11]<br/>with custom boards
| [[C]]
|-
| style="text-align:left;" | [[CHAOS]]
! US
| [[Fred Swartz]], [[Mike Alexander]], [[Jack O’Keefe]],<br/>[[Mark Hersey]], [[Victor Berman]]
| [[AMDAHL 470]]
| [[Fortran]]
|-
| style="text-align:left;" | [[Chaturanga]]
! US
| [[John Poduska, Jr.]]
| [[68000]] based [https://en.wikipedia.org/wiki/Apollo_Computer Apollo] [https://en.wikipedia.org/wiki/Workstation workstation]
| [[Pascal]]
|-
| style="text-align:left;" | [[Chess Challenger|Chess Challenger X]]
! US
| [[Dan Spracklen]], [[Kathe Spracklen]],<br/>[[Ron Nelson]]
| [[6502]] based System
| [[Assembly]]
|-
| style="text-align:left;" | [[Cray Blitz]]
! US
| [[Robert Hyatt]], [[Albert Gower]],<br/>[[David Darling|Dave Darling]], [[Derek Robb]]
| [[Cray-1]]
| [[Fortran|Fortran IV]]
|-
| style="text-align:left;" | [[Cube|Cube 2.1]]
! US
| [[Lloyd L. Lank]], [[James A. Lank]]
| [[Cray-1]]
| [[Fortran]]
|-
| style="text-align:left;" | [[Duchess]]
! US
| [[Tom Truscott]], [[Eric Jensen]], [[Bruce Wright]]
| [[IBM 370]]
| [[Assembly]]
|-
| style="text-align:left;" | [[L'Excentrique]]
! CA
| [[Claude Jarry]]
| [[AMDAHL 470|AMDAHL 470V/7]]
| [[Assembly]]
|-
| style="text-align:left;" | [[MyChess]]
! US
| [[David Kittinger]]
| [[Z80]] [http://www.old-computers.com/museum/computer.asp?c=559&st=1 Cromemco T-2D]
| [[Assembly]]
|-
| style="text-align:left;" | [[Nuchess]]
! US
| [[David Slate]], [[William Blanchard]]
| [[CDC Cyber|CDC Cyber 176]]
| [[Fortran]]
|-
| style="text-align:left;" | [[Ostrich]]
! CA
| [[Monroe Newborn]]
| 5-[[Nova]] Multiprocessing System
| [[Assembly]]
|-
| style="text-align:left;" | [[Philidor]]
! GB
| [[David Broughton]], [[Mark Taylor]],<br/>[[David Levy]], [[Mike Johnson]], [[Kevin O’Connell]]
| [[Z80]] [https://en.wikipedia.org/wiki/Osborne_1 Osborne 1]
| [[Assembly]]
|-
| style="text-align:left;" | [[Prodigy]]
! CA
| [[Jonathan Schaeffer]], [[J. Howard Johnson]]
| [[Honeywell 6000|Honeywell 6600]]
| [[C]]
|-
| style="text-align:left;" | [[Schach|Schach 2.5]]
! DE
| [[Matthias Engelbach]]
| [https://en.wikipedia.org/wiki/Burroughs_large_systems Burroughs 7800]
| [[Algol]]
|}
* [https://en.wikipedia.org/wiki/ISO_3166-1 CC Country Codes]
=Photos=
[[FILE:ACM1981MontyCongratsKen.jpg|none|border|text-bottom]]
The winner: [[Ken Thompson]], programmer of [[Belle]], acceps first-place trophy<br/>from tournament organizer [[Monroe Newborn]] <ref>Image clipped from [http://www.oreilly.com/pub/au/3995 Craig Stinson] ('''1982'''). ''Chess Championship: Machines Play, People Watch''. [https://en.wikipedia.org/wiki/Softalk Softline], Vol. 1, pp. 6</ref>
<span id="R4"></span>
=Selected Games=
In Round 4, [[Cray Blitz]] (3) versus [[Belle]] (2½), Cray Blitz played the losing 28.Qxb6, and missed to win the tournament <ref>[http://www.stmintz.com/ccc/index.php?id=186124 Re: Cray Blitz vs Belle [1981 North American Computer Chess Championship]] by [[Robert Hyatt]], [[CCC]], August 29, 2001</ref> <ref>[http://wondersmith.com/rants/howfar.htm How Far We've Come: 20 Years of Personal Computing] by [http://wondersmith.com/scifi/wilfong.htm Blake Linton Wilfon], November 05, 2000</ref> .
<pre>
[Event "ACM 1981"]
[Site "Los Angeles USA"]
[Date "1981.11.11"]
[Round "4"]
[White "Cray Blitz"]
[Black "Belle"]
[Result "0-1"]
1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Qf3 Rb8
9.Bxc6+ Nxc6 10.Qxc6+ Nd7 11.d3 Be7 12.Ne4 Bb7 13.Qa4 Qc7 14.Nbc3 Bc6 15.Qc4 Qc8
16.Nd5 Bxd5 17.Qxd5 Qxc2 18.O-O f6 19.f4 Nb6 20.Qa5 Qxd3 21.Qxa7 O-O 22.Qxe7 Qxe4
23.Qe6+ Kh8 24.fxe5 fxe5 25.Rxf8+ Rxf8 26.h3 Qe1+ 27.Kh2 h6 28.Qxb6 Rf1 29.Qd8+
Kh7 30.Qd3+ e4 31.Qxf1 Qxf1 32.a3 e3 33.Bxe3 Qxa1 34.Bd4 h5 35.Bc3 g5 36.Be5 Qe1
37.Bc3 Qf2 38.Kh1 g4 39.hxg4 hxg4 40.Kh2 Qh4+ 41.Kg1 g3 42.Kf1 Kg6 0-1
</pre>
Game and short analyze on Lichess.org : [https://en.lichess.org/06p1zUz1]
=See also=
* [[Boris#Controversy|Boris X Controversy]]
=Tournament Director=
* [[Michael Valvo|Mike Valvo]]
=Publications=
* [http://www.computerhistory.org/chess/full_record.php?iid=doc-431614f6ce737 The Twelfth ACM's North American Computer Chess Championship], [http://archive.computerhistory.org/projects/chess/related_materials/text/3-1%20and%203-2%20and%203-3.1981_ACM_NACCC/1981_ACM_NACCC.sm.062303017.pdf pdf] from [[The Computer History Museum]]
* [[Ben Mittman]] ('''1981'''). ''Twelfth ACM North American Computer Chess Championship''. [[ICGA Journal#4_3|ICCA Newletter, Vol. 4, No. 3]]
* [[Ben Mittman]], [[Tony Marsland]], [[Monroe Newborn]], [[Kathe Spracklen]], [[Ken Thompson]] ('''1981'''). ''[http://portal.acm.org/citation.cfm?id=809845&dl=GUIDE&coll=GUIDE&CFID=85837222&CFTOKEN=72556238 Computer chess: Master level play in 1981?]'' [http://portal.acm.org/toc.cfm?id=800175&coll=GUIDE&dl=GUIDE&type=proceeding&idx=SERIES324&part=series&WantType=Proceedings&title=ACM%2FCSC-ER&CFID=87593177&CFTOKEN=36310741 Proceedings of the ACM '81 conference]
* [http://www.oreilly.com/pub/au/3995 Craig Stinson] ('''1982'''). ''Chess Championship: Machines Play, People Watch''. [https://en.wikipedia.org/wiki/Softalk Softline], Vol. 1, [http://www.cgwmuseum.org/galleries/issues/softline_1.3.pdf pdf] ([http://www.cgwmuseum.org/ CGW Museum]), [https://ia601607.us.archive.org/31/items/Softline_Magazine_Issue_1.3/Softline_Magazine_Issue_1.3.pdf pdf] ( [https://de.wikipedia.org/wiki/Internet_Archive Internet Archive]), pp. 6
=Forum Posts=
* [http://www.stmintz.com/ccc/index.php?id=113318 Cray Blity 1981?] by Joshua Lee, [[CCC]], June 02, 2000
* [http://www.stmintz.com/ccc/index.php?id=186117 Cray Blitz vs Belle [1981 North American Computer Chess Championship]] by [[José Antônio Fabiano Mendes]], [[CCC]], August 29, 2001
=External Links=
* [http://www.csvn.nl/index.php/historie/computer-computer/94-acm-1981 ACM 1981] [[CSVN]] site
* [http://portal.acm.org/toc.cfm?id=800175&coll=GUIDE&dl=GUIDE&type=proceeding&idx=SERIES324&part=series&WantType=Proceedings&title=ACM%2FCSC-ER&CFID=87593177&CFTOKEN=36310741 Proceedings of the ACM '81 conference]
{{ACM Include}}
=References=
<references />
'''[[ACM North American Computer Chess Championship|Up one level]]'''
'''[[ACM 1980|< Prev]] [[ACM 1982|Next >]]'''
[[FILE:Westin Bonaventure Hotel.jpg|border|right|thumb| Westin Bonaventure Hotel <ref>[https://commons.wikimedia.org/wiki/File:Westin_Bonaventure_Hotel.jpg Westin Bonaventure Hotel] designed by [[Arts#Portman|John Portman]] - as seen from the platform of [https://en.wikipedia.org/wiki/Citigroup_Center_%28Los_Angeles%29 444 S. Flower Building], [https://en.wikipedia.org/wiki/Downtown_Los_Angeles Downtown Los Angeles], Photo by [https://en.wikipedia.org/wiki/User:Geographer Geographer], December 31, 2006, [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons], [https://en.wikipedia.org/wiki/Westin_Bonaventure_Hotel Westin Bonaventure Hotel from Wikipedia]</ref> ]]
The [[ACM|ACM's]] '''Twelfth North American Computer Chess Championship''' (NACCC) was held from November 8 to 11, [[Timeline#1981|1981]] at the [https://en.wikipedia.org/wiki/Westin_Bonaventure_Hotel Bonaventure Hotel], [https://en.wikipedia.org/wiki/Los_Angeles%2C_California Los Angeles], [https://en.wikipedia.org/wiki/California California], USA <ref>[[Ben Mittman]] ('''1981'''). ''Tournament Announcement - ACM Tournament in Los Angeles''. [[ICGA Journal#4_1|ICCA Newletter, Vol. 4, No. 1]]</ref> .
[[Michael Valvo|Mike Valvo]] acted as Tournament Director, replacing [[David Levy]], who previously served in that capacity and was expected to enter his [[Philidor|own program]]. Tournament guests were ''Shelby Lyman'' <ref>[http://buffalonews.com/2016/05/07/chess-by-shelby-lyman/ Chess by Shelby Lyman], May 7, 2016 » [https://chessdailynews.com/the-chess-tech-evolution/ Susan Polgar Global Chess Daily News and Information - The Chess Tech Evolution]</ref>, chess commentator for [https://en.wikipedia.org/wiki/WNET WNET's] television chess shows and [https://en.wikipedia.org/wiki/Master_of_ceremonies emcee] for the [https://en.wikipedia.org/wiki/World_Chess_Championship_1972 Fisher-Spassky World Championship Match] in 1972 <ref>[http://en.chessbase.com/post/the-man-behind-the-fischer-spaky-show The man behind the Fischer-Spassky show], [[ChessBase|ChessBase News]], January 03, 2003</ref> , and [https://en.wikipedia.org/wiki/Isaac_Kashdan Isaac Kashdan], Chess Editor for the [https://en.wikipedia.org/wiki/Los_Angeles_Times Los Angeles Times]. A computer chess panel discussion and short paper presentation was part of the technical program <ref>[http://www.computer.org/csdl/mags/co/1981/08/01667479.pdf AdvanceProgram ACM 1981, November 9-11, 1981 Bonaventure Hotel, Los Angeles, California] (pdf)</ref> .
=Final Standing=
<ref>[http://www.csvn.nl/index.php/historie/computer-computer/94-acm-1981 ACM 1981] [[CSVN]] site</ref>
{| class="wikitable"
|-
! #
! Program
! CC
! 1
! 2
! 3
! 4
! P
! SOS
! SoDOS
|-
! 1
| style="text-align:left;" | [[Belle]]
! US
| style="text-align:right;" | 7w1
| style="text-align:right;" | 9b1
| style="text-align:right;" | 2w½
| style="text-align:right;" | [[ACM 1981#R4|3b1]]
! 3½
| style="text-align:center;" | 10
| style="text-align:center;" | 8½
|-
! 2
| style="text-align:left;" | [[Nuchess]]
! US
| style="text-align:right;" | 10b1
| style="text-align:right;" | 4w1
| style="text-align:right;" | 1b½
| style="text-align:right;" | 5w½
! 3
| style="text-align:center;" | 11
| style="text-align:center;" | 8
|-
! 3
| style="text-align:left;" | [[Cray Blitz]]
! US
| style="text-align:right;" | 6b1
| style="text-align:right;" | 5w1
| style="text-align:right;" | 12b1
| style="text-align:right;" | [[ACM 1981#R4|1w0]]
! 3
| style="text-align:center;" | 10
| style="text-align:center;" | 6½
|-
! 4
| style="text-align:left;" | [[Bebe]]
! US
| style="text-align:right;" | 11w1
| style="text-align:right;" | 2b0
| style="text-align:right;" | 14b1
| style="text-align:right;" | 7b1
! 3
| style="text-align:center;" | 7½
| style="text-align:center;" | 4½
|-
! 5
| style="text-align:left;" | [[Duchess]]
! US
| style="text-align:right;" | 15w1
| style="text-align:right;" | 3b0
| style="text-align:right;" | 8w1
| style="text-align:right;" | 2b½
! 2½
| style="text-align:center;" | 9
| style="text-align:center;" | 4½
|-
! 6
| style="text-align:left;" | [[Philidor]]
! GB
| style="text-align:right;" | 3w0
| style="text-align:right;" | 15b1
| style="text-align:right;" | 9w1
| style="text-align:right;" | 8b½
! 2½
| style="text-align:center;" | 8
| style="text-align:center;" | 4
|-
! 7
| style="text-align:left;" | [[Ostrich]]
! CA
| style="text-align:right;" | 1b0
| style="text-align:right;" | 16w1
| style="text-align:right;" | 11b1
| style="text-align:right;" | 4w0
! 2
| style="text-align:center;" | 8
| style="text-align:center;" | 1½
|-
! 8
| style="text-align:left;" | [[Chess Challenger|Chess Challenger X]]
! US
| style="text-align:right;" | 14b1
| style="text-align:right;" | 12w½
| style="text-align:right;" | 5b0
| style="text-align:right;" | 6w½
! 2
| style="text-align:center;" | 7½
| style="text-align:center;" | 3
|-
! 9
| style="text-align:left;" | [[L'Excentrique]]
! CA
| style="text-align:right;" | 16b1
| style="text-align:right;" | 1w0
| style="text-align:right;" | 6b0
| style="text-align:right;" | 12w1
! 2
| style="text-align:center;" | 7½
| style="text-align:center;" | 1½
|-
! 10
| style="text-align:left;" | [[MyChess]]
! US
| style="text-align:right;" | 2w0
| style="text-align:right;" | 11b0
| style="text-align:right;" | 15w1
| style="text-align:right;" | 14w1
! 2
| style="text-align:center;" | 6½
| style="text-align:center;" | 2
|-
! 11
| style="text-align:left;" | [[Cube|Cube 2.1]]
! US
| style="text-align:right;" | 4b0
| style="text-align:right;" | 10w1
| style="text-align:right;" | 7w0
| style="text-align:right;" | 13b½
! 1½
| style="text-align:center;" | 8½
| style="text-align:center;" | 2¾
|-
! 12
| style="text-align:left;" | [[CHAOS]]
! US
| style="text-align:right;" | 13w1
| style="text-align:right;" | 8b½
| style="text-align:right;" | 3w0
| style="text-align:right;" | 9b0
! 1½
| style="text-align:center;" | 8½
| style="text-align:center;" | 2½
|-
! 13
| style="text-align:left;" | [[Schach|Schach 2.5]]
! DE
| style="text-align:right;" | 12b0
| style="text-align:right;" | 14w0
| style="text-align:right;" | 16b1
| style="text-align:right;" | 11w½
! 1½
| style="text-align:center;" | 4
| style="text-align:center;" | ¾
|-
! 14
| style="text-align:left;" | [[Chaturanga]]
! US
| style="text-align:right;" | 8w0
| style="text-align:right;" | 13b1
| style="text-align:right;" | 4w0
| style="text-align:right;" | 10b0
! 1
| style="text-align:center;" | 8½
| style="text-align:center;" | 1½
|-
! 15
| style="text-align:left;" | [[Awit]]
! CA
| style="text-align:right;" | 5b0
| style="text-align:right;" | 6w0
| style="text-align:right;" | 10b0
| style="text-align:right;" | 16w1
! 1
| style="text-align:center;" | 7
| style="text-align:center;" | 0
|-
! 16
| style="text-align:left;" | [[Prodigy]]
! CA
| style="text-align:right;" | 9w0
| style="text-align:right;" | 7b0
| style="text-align:right;" | 13w0
| style="text-align:right;" | 15b0
! 0
| style="text-align:center;" | 6½
| style="text-align:center;" | 0
|}
* [https://en.wikipedia.org/wiki/ISO_3166-1 CC Country Codes]
* SOS: [https://en.wikipedia.org/wiki/Buchholz_system Sum of Opponent Scores]
* SoDOS: [https://en.wikipedia.org/wiki/Neustadtl_score Sum of Defeated Opponent Scores]
=Participants=
<ref>[[Ben Mittman]] ('''1981'''). ''Twelfth ACM North American Computer Chess Championship''. [[ICGA Journal#4_3|ICCA Newletter, Vol. 4, No. 3]]</ref>
{| class="wikitable"
|-
! Program
! CC
! Team
! Hardware
! Language
|-
| style="text-align:left;" | [[Awit]]
! CA
| [[Tony Marsland]]
| [[AMDAHL 470|AMDAHL 470V/7]]
| [[Algol|Algol-W]]
|-
| style="text-align:left;" | [[Bebe]]
! US
| [[Tony Scherzer]]
| [https://en.wikipedia.org/wiki/Bit_slicing Bit Slice] Chess hardware
| [[Assembly]]
|-
| style="text-align:left;" | [[Belle]]
! US
| [[Ken Thompson]], [[Joe Condon]]
| [[PDP-11|PDP-11/23]], [https://en.wikipedia.org/wiki/LSI-11#LSI-11 LSI-11]<br/>with custom boards
| [[C]]
|-
| style="text-align:left;" | [[CHAOS]]
! US
| [[Fred Swartz]], [[Mike Alexander]], [[Jack O’Keefe]],<br/>[[Mark Hersey]], [[Victor Berman]]
| [[AMDAHL 470]]
| [[Fortran]]
|-
| style="text-align:left;" | [[Chaturanga]]
! US
| [[John Poduska, Jr.]]
| [[68000]] based [https://en.wikipedia.org/wiki/Apollo_Computer Apollo] [https://en.wikipedia.org/wiki/Workstation workstation]
| [[Pascal]]
|-
| style="text-align:left;" | [[Chess Challenger|Chess Challenger X]]
! US
| [[Dan Spracklen]], [[Kathe Spracklen]],<br/>[[Ron Nelson]]
| [[6502]] based System
| [[Assembly]]
|-
| style="text-align:left;" | [[Cray Blitz]]
! US
| [[Robert Hyatt]], [[Albert Gower]],<br/>[[David Darling|Dave Darling]], [[Derek Robb]]
| [[Cray-1]]
| [[Fortran|Fortran IV]]
|-
| style="text-align:left;" | [[Cube|Cube 2.1]]
! US
| [[Lloyd L. Lank]], [[James A. Lank]]
| [[Cray-1]]
| [[Fortran]]
|-
| style="text-align:left;" | [[Duchess]]
! US
| [[Tom Truscott]], [[Eric Jensen]], [[Bruce Wright]]
| [[IBM 370]]
| [[Assembly]]
|-
| style="text-align:left;" | [[L'Excentrique]]
! CA
| [[Claude Jarry]]
| [[AMDAHL 470|AMDAHL 470V/7]]
| [[Assembly]]
|-
| style="text-align:left;" | [[MyChess]]
! US
| [[David Kittinger]]
| [[Z80]] [http://www.old-computers.com/museum/computer.asp?c=559&st=1 Cromemco T-2D]
| [[Assembly]]
|-
| style="text-align:left;" | [[Nuchess]]
! US
| [[David Slate]], [[William Blanchard]]
| [[CDC Cyber|CDC Cyber 176]]
| [[Fortran]]
|-
| style="text-align:left;" | [[Ostrich]]
! CA
| [[Monroe Newborn]]
| 5-[[Nova]] Multiprocessing System
| [[Assembly]]
|-
| style="text-align:left;" | [[Philidor]]
! GB
| [[David Broughton]], [[Mark Taylor]],<br/>[[David Levy]], [[Mike Johnson]], [[Kevin O’Connell]]
| [[Z80]] [https://en.wikipedia.org/wiki/Osborne_1 Osborne 1]
| [[Assembly]]
|-
| style="text-align:left;" | [[Prodigy]]
! CA
| [[Jonathan Schaeffer]], [[J. Howard Johnson]]
| [[Honeywell 6000|Honeywell 6600]]
| [[C]]
|-
| style="text-align:left;" | [[Schach|Schach 2.5]]
! DE
| [[Matthias Engelbach]]
| [https://en.wikipedia.org/wiki/Burroughs_large_systems Burroughs 7800]
| [[Algol]]
|}
* [https://en.wikipedia.org/wiki/ISO_3166-1 CC Country Codes]
=Photos=
[[FILE:ACM1981MontyCongratsKen.jpg|none|border|text-bottom]]
The winner: [[Ken Thompson]], programmer of [[Belle]], acceps first-place trophy<br/>from tournament organizer [[Monroe Newborn]] <ref>Image clipped from [http://www.oreilly.com/pub/au/3995 Craig Stinson] ('''1982'''). ''Chess Championship: Machines Play, People Watch''. [https://en.wikipedia.org/wiki/Softalk Softline], Vol. 1, pp. 6</ref>
<span id="R4"></span>
=Selected Games=
In Round 4, [[Cray Blitz]] (3) versus [[Belle]] (2½), Cray Blitz played the losing 28.Qxb6, and missed to win the tournament <ref>[http://www.stmintz.com/ccc/index.php?id=186124 Re: Cray Blitz vs Belle [1981 North American Computer Chess Championship]] by [[Robert Hyatt]], [[CCC]], August 29, 2001</ref> <ref>[http://wondersmith.com/rants/howfar.htm How Far We've Come: 20 Years of Personal Computing] by [http://wondersmith.com/scifi/wilfong.htm Blake Linton Wilfon], November 05, 2000</ref> .
<pre>
[Event "ACM 1981"]
[Site "Los Angeles USA"]
[Date "1981.11.11"]
[Round "4"]
[White "Cray Blitz"]
[Black "Belle"]
[Result "0-1"]
1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Qf3 Rb8
9.Bxc6+ Nxc6 10.Qxc6+ Nd7 11.d3 Be7 12.Ne4 Bb7 13.Qa4 Qc7 14.Nbc3 Bc6 15.Qc4 Qc8
16.Nd5 Bxd5 17.Qxd5 Qxc2 18.O-O f6 19.f4 Nb6 20.Qa5 Qxd3 21.Qxa7 O-O 22.Qxe7 Qxe4
23.Qe6+ Kh8 24.fxe5 fxe5 25.Rxf8+ Rxf8 26.h3 Qe1+ 27.Kh2 h6 28.Qxb6 Rf1 29.Qd8+
Kh7 30.Qd3+ e4 31.Qxf1 Qxf1 32.a3 e3 33.Bxe3 Qxa1 34.Bd4 h5 35.Bc3 g5 36.Be5 Qe1
37.Bc3 Qf2 38.Kh1 g4 39.hxg4 hxg4 40.Kh2 Qh4+ 41.Kg1 g3 42.Kf1 Kg6 0-1
</pre>
Game and short analyze on Lichess.org : [https://en.lichess.org/06p1zUz1]
=See also=
* [[Boris#Controversy|Boris X Controversy]]
=Tournament Director=
* [[Michael Valvo|Mike Valvo]]
=Publications=
* [http://www.computerhistory.org/chess/full_record.php?iid=doc-431614f6ce737 The Twelfth ACM's North American Computer Chess Championship], [http://archive.computerhistory.org/projects/chess/related_materials/text/3-1%20and%203-2%20and%203-3.1981_ACM_NACCC/1981_ACM_NACCC.sm.062303017.pdf pdf] from [[The Computer History Museum]]
* [[Ben Mittman]] ('''1981'''). ''Twelfth ACM North American Computer Chess Championship''. [[ICGA Journal#4_3|ICCA Newletter, Vol. 4, No. 3]]
* [[Ben Mittman]], [[Tony Marsland]], [[Monroe Newborn]], [[Kathe Spracklen]], [[Ken Thompson]] ('''1981'''). ''[http://portal.acm.org/citation.cfm?id=809845&dl=GUIDE&coll=GUIDE&CFID=85837222&CFTOKEN=72556238 Computer chess: Master level play in 1981?]'' [http://portal.acm.org/toc.cfm?id=800175&coll=GUIDE&dl=GUIDE&type=proceeding&idx=SERIES324&part=series&WantType=Proceedings&title=ACM%2FCSC-ER&CFID=87593177&CFTOKEN=36310741 Proceedings of the ACM '81 conference]
* [http://www.oreilly.com/pub/au/3995 Craig Stinson] ('''1982'''). ''Chess Championship: Machines Play, People Watch''. [https://en.wikipedia.org/wiki/Softalk Softline], Vol. 1, [http://www.cgwmuseum.org/galleries/issues/softline_1.3.pdf pdf] ([http://www.cgwmuseum.org/ CGW Museum]), [https://ia601607.us.archive.org/31/items/Softline_Magazine_Issue_1.3/Softline_Magazine_Issue_1.3.pdf pdf] ( [https://de.wikipedia.org/wiki/Internet_Archive Internet Archive]), pp. 6
=Forum Posts=
* [http://www.stmintz.com/ccc/index.php?id=113318 Cray Blity 1981?] by Joshua Lee, [[CCC]], June 02, 2000
* [http://www.stmintz.com/ccc/index.php?id=186117 Cray Blitz vs Belle [1981 North American Computer Chess Championship]] by [[José Antônio Fabiano Mendes]], [[CCC]], August 29, 2001
=External Links=
* [http://www.csvn.nl/index.php/historie/computer-computer/94-acm-1981 ACM 1981] [[CSVN]] site
* [http://portal.acm.org/toc.cfm?id=800175&coll=GUIDE&dl=GUIDE&type=proceeding&idx=SERIES324&part=series&WantType=Proceedings&title=ACM%2FCSC-ER&CFID=87593177&CFTOKEN=36310741 Proceedings of the ACM '81 conference]
{{ACM Include}}
=References=
<references />
'''[[ACM North American Computer Chess Championship|Up one level]]'''
