ACM 1981

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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.

=Final Standing=
 * CC Country Codes
 * SOS: Sum of Opponent Scores
 * SoDOS: Sum of Defeated Opponent Scores

=Participants=
 * CC Country Codes

=Photos= The winner: Ken Thompson, programmer of Belle, acceps first-place trophy 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. [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 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=
 * ACM 1981 CSVN site
 * Proceedings of the ACM '81 conference

=References=

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