ACM 1991

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Home * Tournaments * ACM North American Computer Chess Championship * ACM 1991

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Hotel DoubleTree by Hilton [1]

ACM's 22nd North American Computer Chess Championship (NACCC), alongside the ACM/IEEE Supercomputing Conference, was held November 17-20, 1991 at the Doubletree Hotel, Albuquerque, New Mexico, USA.

Final Standing


# Program CC 1 2 3 4 5 P SOS SoDOS
1 Deep Thought II US 7w1 2b1 5w1 3b1 6w1 5 14½ 14½
2 M-Chess US 12b1 1w0 8w1 9b1 5w1 4 12 7
3 Cray Blitz US 9w1 8b½ 6w½ 1w0 7b1 3 14½ 7
4 Mephisto GB 8b0 10w1 7b0 11w1 9w1 3 10 5
5 HiTech US 10b1 6w1 1b0 7w½ 2b0 16
6 ChessMachine Schroder NL 11w1 5b0 3b½ 8w1 1b0 14 5
7 Zarkov US 1b0 12w1 4w1 5b½ 3w0 13½
8 Socrates US 4w1 3w½ 2b0 6b0 12w1 12½
9 BP US 3b0 11b1 10w1 2w0 4b0 2 13 3
10 Lachex US 5w0 4b0 9b0 12w1 11b1 2 1
11 Bebe US 6b0 9w0 12b1 4b0 10w0 1 0
12 Delicate Brute GB 2w0 7b0 11w0 10b0 8b0 0 12 0



Program CC Team Hardware Language
Bebe US Tony Scherzer, Linda Scherzer SYS-10 bit slice hardware Assembly
BP US Robert Cullum IBM PC 486/33 C, Assembly
ChessMachine Schroder NL Ed Schröder, Jan Louwman ARM2 31 MHz
Cray Blitz US Robert Hyatt, Albert Gower Cray Y-MP-8 Fortran, C, Assembly
Deep Thought II US Feng-hsiung Hsu, Murray Campbell,
Joe Hoane, Jerry Brody
RS/6000 550 &
24 custom chess processors
C, Microcode
Delicate Brute GB Don Beal Sun-4
HiTech US Carl Ebeling, Hans Berliner,
Chris McConnell
Sun-4 &
special chess hardware
Microcode, Assembly
Lachex US Tony Warnock, Burton Wendroff Cray Y-MP ZE Fortran, Assembly
M-Chess US Marty Hirsch IBM PC 486 C, Assembly
Mephisto GB Richard Lang 68030 Assembly
Socrates US Don Dailey, Larry Kaufman IBM PC 486/33 Assembly
Zarkov US John Stanback HP 9000/732 C



Playing Hall, Jaap van den Herik talking with Marty Hirsch [4]

Knight Promotion

As recently mentioned by Robert Hyatt [5] , Lachex didn't notice the knight minor promotion with 48... Qe4 versus Mephisto:

[Event "ACM 1991"]
[Site "Albuquerque USA"]
[Date "1991.11.12"]
[Round "2"]
[White "Mephisto"]
[Black "Lachex"]
[Result "1-0"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6
9.Nbd2 Nc5 10.c3 d4 11.Bxe6 Nxe6 12.cxd4 Ncxd4 13.Ne4 Be7 14.Be3 Nf5 15.Qc2
O-O 16.Nf6+ Bxf6 17.Qxf5 Be7 18.Rfd1 Qc8 19.Rd2 c5 20.Rad1 Qc6 21.b3 Rad8
22.h3 c4 23.bxc4 bxc4 24.Nd4 Nxd4 25.Rxd4 c3 26.Rc1 Ba3 27.Rc2 Bb2 28.Qe4
Qe6 29.Ra4 Rd1+ 30.Kh2 Rfd8 31.Rc4 Rc8 32.Rxc8+ Qxc8 33.a4 Ra1 34.Bb6 Qe8
35.a5 Ra4 36.Qd5 Rb4 37.Qd6 Rc4 38.Kg1 h6 39.Qd3 Ra4 40.Qd6 Re4 41.Bc7 Re1+
42.Kh2 Qc8 43.Qb6 Qf5 44.Qb8+ Kh7 45.e6 Qxc2 46.exf7 Ba3 47.Qg8+ Kg6 48.Qe8
Qe4 49.f8=N+ Kf6 50.Nd7+ Kg5 1-0

Game and short analyze on : [1]

Where is Computer Chess Going?

A technical session titled Where is Computer Chess Going was moderated by Tony Marsland, with Hans Berliner, Monroe Newborn, Murray Campbell, Robert Levinson and Jaap van den Herik attending as panelist [6] . At one point the discussion went on brute strength versus trimming techniques - Campbell replied that both approaches will eventually succeed. Larry Kaufman commented from the audience that selective searches outperform full width on comparable hardware. Don Dailey mentioned that one main goal is to beat the World Champion. He asked "How long will it take to cross the extra distance and play a perfect game?". Berliner replied, "Centuries! A perfect game is a science-fiction dream". Further, Robert Levinson gave a presentation of his Morph project.

Tournament Director



Technical Session

External Links


  1. DoubleTree Albuquerque by the University of New Mexico
  2. ACM 1991 CSVN site
  3. Danny Kopec, Monroe Newborn, Michael Valvo (1992). The 22d Annual ACM International Chess Championship. in The 23rd ACM International Computer Chess Championship from The Computer History Museum, pdf
  4. Photo by Terry D. Moore, ACM Photographer of the event, ICCA Journal, Vol. 14, No. 4, pp. 225
  5. Re: KPK bitbase by Robert Hyatt, CCC, January 18, 2013
  6. Garth Courtois Jr. (1991). Where is Computer Chess Going? ICCA Journal, Vol. 14, No. 4

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