ACM 1975

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The ACM's Sixth North American Computer Chess Championship (NACCC), was held in the Radisson Hotel, Minneapolis, Minnesota, USA, October 19-21, 1975. During this event, International Master David Levy, the tournament director, won a simultaneous exhibition against the 12 computers (10 wins and 2 draws). In 1975, the programs reached the level of class A players (1800-2000 rating).

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

=Participants=
 * CC Country Codes

=Photos & Games=

Round 1
Etaoin Shrdlu - Ostrich [Event "ACM 1975"] [Site "Minneapolis, MN"] [Date "1975.10.19"] [Round "1"] [White "Etaoin Shrdlu"] [Black "Ostrich"] [Result "1-0"]

1.e4 e5 2.Bc4 Nf6 3.Nf3 Nxe4 4.Nxe5 d5 5.Be2 f6 6.Bb5+ Ke7 7.Nf3 c6 8.Be2 Bg4 9.O-O Kf7 10.d4 Be7 11.Nbd2 Bxf3 12.Nxf3 Qd6 13.Nh4 g5 14.Nf5 Qe6 15.Bg4 Kf8 16.Nxe7 Qxe7 17.f4 h6 18.fxg5 hxg5 19.Re1 Rh4 20.g3 Rh6 21.Bd2 c5 22.dxc5 Qxc5+ 23.Be3 Qb5 24.Rc1 Qxb2 25.Qxd5 Nxg3 26.Bc5+ Kg7 27.hxg3 Na6 28.Rb1 Qxc2 29.Qxb7+ Kg6 30.Qxa8 Qxc5+ 31.Kg2 Rh7 32.Qg8+ Rg7 33.Qe8+ Rf7 34.Bh5+ Kxh5 35.Qxf7+ Kg4 36.Qe6+ Kh5 37.g4+ Kh6 38.Qxf6+ Kh7 39.Rh1+ Kg8 40.Rh8# 1-0

Round 2
David Slate and Larry Atkin in Chess 4.4 vs. Etaoin Shrdlu [Event "ACM 1975"] [Site "Minneapolis, MN"] [Date "1975.10.19"] [Round "2"] [White "Chess 4.4"] [Black "Etaoin Shrdlu"] [Result "1-0"]

1.f4 d5 2.Nf3 Nc6 3.e3 Bf5 4.Bb5 Nf6 5.Ne5 Qd6 6.O-O a6 7.Bxc6+ bxc6 8.g4 Bd7 9.g5 Ne4 10.Nxd7 Qxd7 11.d3 Nd6 12.Nd2 g6 13.Qf3 Bg7 14.c4 Rb8 15.Nb3 O-O 16.cxd5 cxd5 17.Qxd5 c6 18.Qg2 Rb5 19.d4 Rd8 20.Nc5 Qc8 21.a4 Rb4 22.Qe2 a5 23.b3 Nf5 24.Bb2 Qc7 25.Na6 Qd6 26.Nxb4 Qxb4 27.Qd3 c5 28.Ba3 Qb6 29.Rac1 cxd4 30.e4 Nd6 31.Bc5 Qb8 32.f5 gxf5 33.exf5 h5 34.Rcd1 Be5 35.Qh3 Ne4 36.Bxe7 Rd7 37.f6 Rd5 38.Kh1 Nc3 39.Rd3 Qxb3 40.g6 Qb7 41.Qxh5 Rd8+ 42.Rdf3 Qxf3+ 43.Rxf3 fxg6 44.Qxg6+ Kh8 45.Rh3# 1-0 Game and short analyze on Lichess.org :

Round 4
Photo labeled Newborn and Courtois shows Ostrich vs. Iron Fish after 5... Qa5 [Event "ACM 1975"] [Site "Minneapolis, MN"] [Date "1975.10.21"] [Round "4"] [White "Ostrich"] [Black "Iron Fish"] [Result "1/2-1/2"]

1.e4 d5 2.exd5 Qxd5 3.Nc3 Qe5+ 4.Nge2 Nf6 5.d4 Qa5 6.Be3 Bf5 7.Ng3 Bg4 8.Be2 Bxe2 9.Qxe2 Nbd7 10.O-O Qb4 11.Qb5 Qxb5 12.Nxb5 O-O-O 13.Nxa7+ Kb8 14.Nb5 e5 15.dxe5 Nxe5 16.Bg5 Bb4 17.Bxf6 gxf6 18.c3 Rd5 19.Nxc7 Rd2 20.cxb4 Kxc7 21.b3 Kc6 22.Ne4 Re2 23.Rfe1 Rxe1+ 24.Rxe1 f5 25.Ng3 Nd3 26.Re7 f4 27.Nh5 f5 28.a3 Ra8 29.a4 b5 30.Rxh7 bxa4 31.Rh6+ Kc7 32.Rh7+ Kc6 33.Rh6+ Kc7 34.bxa4 Rxa4 35.Rh7+ Kd6 36.Rh6+ Ke5 37.Kf1 Ra1+ 38.Ke2 Nxb4 39.h4 Rc1 40.Rb6 Nd5 41.Rh6 Rc2+ 42.Kf3 Rc3+ 43.Ke2 Rc2+ 44.Kf1 Rc1+ 45.Ke2 Rc2+ 1/2-1/2

Levy Simul
Larry Atkin during the David Levy simultaneous exhibition against the 12 computers

=Reports=
 * David Levy (1976). 1975 U.S. Computer chess championship. Computer Science Press
 * Monty Newborn (1977). David vs. 12 Goliaths. The Best of Creative Computing Volume 2, edited by David Ahl, hosted by AtariArchives.org
 * Monty Newborn (1977). Summary of the ACM Sixth U.S. Computer Chess Championship. The Best of Creative Computing Volume 2, edited by David Ahl, hosted by AtariArchives.org
 * Ben Mittman (1977). A Brief History of Computer Chess Tournaments: 1970-1975. in Peter W. Frey (ed.) Chess Skill in Man and Machine

=Forum Posts=
 * KRBKB and ACM USCCC #6 by Steven J. Edwards, rgcc, September 29, 1996 » Treefrog, David Levy

=External Links=
 * ACM 1975 CSVN site
 * Proceedings of the 1975 ACM Annual Conference

=References=

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