ACM+1981


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 * [[image:360px-Westin_Bonaventure_Hotel.jpg width="288" height="384" link="https://commons.wikimedia.org/wiki/File:Westin_Bonaventure_Hotel.jpg"]] ||~  || The ACM's **Twelfth North American Computer Chess Championship** (NACCC) was held from November 8 to 11, 1981 at the [|Bonaventure Hotel], [|Los Angeles], [|California], USA.

Mike Valvo acted as Tournament Director, replacing David Levy, who previously served in that capacity and was expected to enter his own program. Tournament guests were //Shelby Lyman//, chess commentator for [|WNET's] television chess shows and [|emcee] for the [|Fisher-Spassky World Championship Match] in 1972 , and [|Isaac Kashdan], Chess Editor for the [|Los Angeles Times]. A computer chess panel discussion and short paper presentation was part of the technical program. || toc =Final Standing=
 * Westin Bonaventure Hotel ||~  ||^   ||
 * ~ # ||~ Program ||~ CC ||~ 1 ||~ 2 ||~ 3 ||~ 4 ||~ P ||~ SOS ||~ SoDOS ||
 * ~ 1 ||< Belle ||~ US ||> 7w1 ||> 9b1 ||> 2w½ ||> 3b1 ||~ 3½ ||= 10 ||= 8½ ||
 * ~ 2 ||< Nuchess ||~ US ||> 10b1 ||> 4w1 ||> 1b½ ||> 5w½ ||~ 3 ||= 11 ||= 8 ||
 * ~ 3 ||< Cray Blitz ||~ US ||> 6b1 ||> 5w1 ||> 12b1 ||> 1w0 ||~ 3 ||= 10 ||= 6½ ||
 * ~ 4 ||< Bebe ||~ US ||> 11w1 ||> 2b0 ||> 14b1 ||> 7b1 ||~ 3 ||= 7½ ||= 4½ ||
 * ~ 5 ||< Duchess ||~ US ||> 15w1 ||> 3b0 ||> 8w1 ||> 2b½ ||~ 2½ ||= 9 ||= 4½ ||
 * ~ 6 ||< Philidor ||~ GB ||> 3w0 ||> 15b1 ||> 9w1 ||> 8b½ ||~ 2½ ||= 8 ||= 4 ||
 * ~ 7 ||< Ostrich ||~ CA ||> 1b0 ||> 16w1 ||> 11b1 ||> 4w0 ||~ 2 ||= 8 ||= 1½ ||
 * ~ 8 ||< Chess Challenger X ||~ US ||> 14b1 ||> 12w½ ||> 5b0 ||> 6w½ ||~ 2 ||= 7½ ||= 3 ||
 * ~ 9 ||< L'Excentrique ||~ CA ||> 16b1 ||> 1w0 ||> 6b0 ||> 12w1 ||~ 2 ||= 7½ ||= 1½ ||
 * ~ 10 ||< MyChess ||~ US ||> 2w0 ||> 11b0 ||> 15w1 ||> 14w1 ||~ 2 ||= 6½ ||= 2 ||
 * ~ 11 ||< Cube 2.1 ||~ US ||> 4b0 ||> 10w1 ||> 7w0 ||> 13b½ ||~ 1½ ||= 8½ ||= 2¾ ||
 * ~ 12 ||< CHAOS ||~ US ||> 13w1 ||> 8b½ ||> 3w0 ||> 9b0 ||~ 1½ ||= 8½ ||= 2½ ||
 * ~ 13 ||< Schach 2.5 ||~ DE ||> 12b0 ||> 14w0 ||> 16b1 ||> 11w½ ||~ 1½ ||= 4 ||= ¾ ||
 * ~ 14 ||< Chaturanga ||~ US ||> 8w0 ||> 13b1 ||> 4w0 ||> 10b0 ||~ 1 ||= 8½ ||= 1½ ||
 * ~ 15 ||< Awit ||~ CA ||> 5b0 ||> 6w0 ||> 10b0 ||> 16w1 ||~ 1 ||= 7 ||= 0 ||
 * ~ 16 ||< Prodigy ||~ CA ||> 9w0 ||> 7b0 ||> 13w0 ||> 15b0 ||~ 0 ||= 6½ ||= 0 ||
 * [|CC Country Codes]
 * SOS: [|Sum of Opponent Scores]
 * SoDOS: [|Sum of Defeated Opponent Scores]

=Participants= with custom boards || C || Mark Hersey, Victor Berman || AMDAHL 470 || Fortran || Ron Nelson || 6502 based System || Assembly || Dave Darling, Derek Robb || Cray-1 || Fortran IV || David Levy, Mike Johnson, Kevin O’Connell || Z80 [|Osborne 1] || Assembly ||
 * ~ Program ||~ CC ||~ Team ||~ Hardware ||~ Language ||
 * < Awit ||~ CA || Tony Marsland || AMDAHL 470V/7 || Algol-W ||
 * < Bebe ||~ US || Tony Scherzer || [|Bit Slice] Chess hardware || Assembly ||
 * < Belle ||~ US || Ken Thompson, Joe Condon || PDP-11/23, [|LSI-11]
 * < CHAOS ||~ US || Fred Swartz, Mike Alexander, Jack O’Keefe,
 * < Chaturanga ||~ US || John Poduska, Jr. || 68000 based [|Apollo] [|workstation] || Pascal ||
 * < Chess Challenger X ||~ US || Dan Spracklen, Kathe Spracklen,
 * < Cray Blitz ||~ US || Robert Hyatt, Albert Gower,
 * < Cube 2.1 ||~ US || Lloyd L. Lank, James A. Lank || Cray-1 || Fortran ||
 * < Duchess ||~ US || Tom Truscott, Eric Jensen, Bruce Wright || IBM 370 || Assembly ||
 * < L'Excentrique ||~ CA || Claude Jarry || AMDAHL 470V/7 || Assembly ||
 * < MyChess ||~ US || David Kittinger || Z80 [|Cromemco T-2D] || Assembly ||
 * < Nuchess ||~ US || David Slate, William Blanchard || CDC Cyber 176 || Fortran ||
 * < Ostrich ||~ CA || Monroe Newborn || 5-Nova Multiprocessing System || Assembly ||
 * < Philidor ||~ GB || David Broughton, Mark Taylor,
 * < Prodigy ||~ CA || Jonathan Schaeffer, J. Howard Johnson || Honeywell 6600 || C ||
 * < Schach 2.5 ||~ DE || Matthias Engelbach || [|Burroughs 7800] || Algol ||
 * [|CC Country Codes]

=Photos= from tournament organizer Monroe Newborn ||  =Selected Games= In Round 4, Cray Blitz (3) versus Belle (2½), Cray Blitz played the losing 28.Qxb6, and missed to win the tournament. code [Event "ACM 1981"] [Site "Los Angeles USA"] [Date "1981.11.11"] [Round "4"] [White "Cray Blitz"] [Black "Belle"] [Result "0-1"]
 * [[image:ACM1981MontyCongratsKen.jpg]] ||
 * The winner: Ken Thompson, programmer of Belle, acceps first-place trophy

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 code Game and short analyze on Lichess.org : []

=See also=
 * Boris X Controversy

=Tournament Director=
 * Mike Valvo

=Publications=
 * [|The Twelfth ACM's North American Computer Chess Championship], [|pdf] from The Computer History Museum
 * Ben Mittman (**1981**). //Twelfth ACM North American Computer Chess Championship//. ICCA Newletter, Vol. 4, No. 3
 * Ben Mittman, Tony Marsland, Monroe Newborn, Kathe Spracklen, Ken Thompson (**1981**). //[|Computer chess: Master level play in 1981?]// [|Proceedings of the ACM '81 conference]
 * [|Craig Stinson] (**1982**). //Chess Championship: Machines Play, People Watch//. [|Softline], Vol. 1, [|pdf] ([|CGW Museum]), [|pdf] ( [|Internet Archive]), pp. 6

=Forum Posts=
 * [|Cray Blity 1981?] by Joshua Lee, CCC, June 02, 2000
 * [|Cray Blitz vs Belle [1981 North American Computer Chess Championship]] by José Antônio Fabiano Mendes, CCC, August 29, 2001

=External Links= include page="ACM Include" =References= =What links here?= include component="backlinks" page="ACM 1981" limit="40"
 * [|ACM 1981] CSVN site
 * [|Proceedings of the ACM '81 conference]
 * Up one level**