ACM 1973

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The ACM's Fourth North American Computer Chess Championship (NACCC) was held from August 26 to 28, 1973 at the Hyatt Regency Hotel, Atlanta, Georgia, USA.

=Final Standing=
 * SOS: Sum of Opponent Scores

=Participants=

=The Tournament=

The defending champions had completely rewritten their program using Shannon's type A strategy and renamed it Chess 4.0. They did it again, but not with a 100% score - after winning three ACM tournaments and ten consecutive tournament games, it only managed to draw from Dartmouth CP in round 2 - being in trouble most of the game, Dartmouth CP repeated the position for the third time while one pawn ahead. In the third round Tech 2 defeated Dartmouth CP, Chess 4.0 defeated Coko 4 and CHAOS won its third straight game to take the lead in the tournament. The last round pitted Chess 4.0 against CHAOS - the winner would win the tournament. The game was a highly tactical one in which the large trees examined by Chess were too much for CHAOS to handle. On the last evening of the tournament, after the Chess 4.0 versus CHAOS game was completed, Charles Kalme played both programs in a simultaneous exhibition with a Queen handicap. He won the game against CHAOS (and a $100 side bet) but lost from Chess 4.0.

=Selected Games= Round 4, CHAOS - Chess 4.0 [Event "ACM 1973"] [Site "Atlanta USA"] [Date "1973.08.28"] [Round "4"] [White "CHAOS"] [Black "Chess 4.0"] [Result "0-1"]

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Qe2 b5 8.Bb3 Bb7 9.Nc3 Nbd7 10.Bd2 Bd6 11.Rfe1 cxd4 12.exd4 O-O 13.Bg5 Qb6 14.Bc2 Bxf3 15.Qxf3 Qxd4 16.Rad1 Qb4 17.g3 Qxb2 18.Re2 Qa3 19.Qc6 Bb4 20.Rxd7 Rac8 21.Rc7 Rxc7 22.Qxc7 Qxc3 23.Qb7 Qc4 24.Bd1 Rd8 25.Re5 Rxd1+ 26.Kg2 Qf1+ 27.Kf3 Qh1+ 28.Ke2 Re1+ 29.Kd3 Qf1+ 30.Kd4 Qc4# 0-1 Game and short analyze on Lichess.org :

=Tournament Director=
 * David Levy

=Publications=
 * Steve Coles (1973). Fourth United States computer chess championship from ACM73 news release. ACM SIGART Bulletin, No. 41
 * Ben Mittman, Monty Newborn (1973). Results of the fourth annual U.S. computer chess tournament. ACM SIGART Bulletin, No. 42
 * Richard Fikes (1974). Fourth U.S. Computer Chess Championship. ACM SIGART Bulletin, No. 44, 45
 * Monroe Newborn (1975). Computer Chess. Academic Press, New York, N.Y. ISBN 0-125-17250-8.
 * Chapter IX. The Fourth United States Computer Chess Championship

=External Links=
 * ACM 1973 CSVN site
 * Proceedings of the ACM annual conference
 * Shawn Lane, Jonas Hellborg, Jeff Sipe - Improvisation, Atlanta Drums & Percussion, August 19, 1996, YouTube Video

=References=

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