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LogiChess,
the first chess program by Kaare Danielsen developed in 1981 for an Intel 8048 compatible 80C50 CMOS microcontroller with 4 K Kibi internal EPROM and only 256 byte internal RAM, and a clock frequency of 3.6 resp. 7.2 MHz. It competed at the 2nd European MCC 1981 (3rd place) ^[1] and two World Microcomputer Chess Championships in 1981 and 1983, at times supported by Hartvig Ekner ^[2].

SciSys & CXG

As dedicated chess computer, LogiChess was sold in approximately 200.000 units ^[3] from SciSys as SciSys Explorer, SciSys Concord II and SciSys Companion II, and from RadioShack as Tandy 1650 ^[4]. Another 4K branch was realized for Newcrest Technology, for the 6800 instruction set compatible Hitachi HD6301V1 8-bit controller for the CXG Computachess III in 1984 ^[5], as well the Newcrest 6301V ^[6] inside the CXG Star Chess of 1985 ^{[7] [8]}. According to its author, LogiChess is still the strongest 4K chess computer in the world ^[9].

Lexibook

The Motorola 6800 LogiChess branch was still in production in the 2000s, as used in all the Lexibook computers ^[10] with 68HC08 compatible microcontrollers ^{[11] [12] [13] [14]}.

Selected Games

WMCCC 1983, round 1, 65 Cyrus X - LogiChess 2.2 ^[15]

[Event "WMCCC 1983"]
[Site "Budapest, Hungary"]
[Date "1983.10.13"]
[Round "1"]
[White "65 Cyrus X"]
[Black "LogiChess 2.2"]
[Result "0-1"]
 
1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.e3 Nc6 5.Be2 Ne4 6.Nxe4 dxe4 7.c5 Qg5 8.g3 Qf5 
9.Bg4 Qd5 10.Bd2 h5 11.Be2 e5 12.Bc3 h4 13.Bb5 hxg3 14.Bxc6+ Qxc6 15.fxg3 Be6 
16.h4 b6 17.cxb6 axb6 18.a4 exd4 19.Qxd4 f6 20.Qd1 Bc5 21.Ne2 Bxe3 22.Nd4 Qd6 
23.Ne2 Qxd1+ 24.Kxd1 Rxa4 25.Kc2 b5 26.Rxa4 bxa4 27.Bd4 Bh6 28.Nc3 Bb3+ 29.Kb1 
f5 30.g4 fxg4 31.Nxe4 O-O 32.Re1 Rf3 33.Ng5 Bxg5 34.hxg5 Rd3 35.g6 Rd1+ 36.Rxd1 
Bxd1 37.Kc1 Bf3 38.Kd2 Be4 39.Ke3 Bxg6 40.Be5 c5 41.Kf4 Bh5 42.Kg5 g6 43.Kf6 c4 
44.Ke6 c3 45.bxc3 a3 46.c4 a2 47.c5 g3 48.c6 g2 49.Bd4 g1=Q 50.Bxg1 a1=Q 51.Bc5 
Bg4+ 52.Kd6 Bf3 53.Bf2 Qd1+ 54.Kc7 Qc1 55.Bg3 Qxc6+ 56.Kd8 Bg4 57.Ke7 Qe6+ 
58.Kd8 Qd7# 0-1 

See also

• CXG Computachess III
• CXG Star Chess
• Enterprise
• SciSys Explorer

External Links

• LogiChess' ICGA Tournaments
• Resume for Kaare Danielsen

References

1. ^ Logichess by the 17-year-old Danish schoolboy Kaare Danielsen was 3rd, from
   Chess Computers - The UK Story from Chess Computer UK by Mike Watters
2. ^ Frederic Friedel (1984). Move from the East. Report of the WMCCC 1983, Personal Computer World, January 1984
3. ^ Resume for Kaare Danielsen
4. ^ Tandy 1650 from Schachcomputer.info Wiki
5. ^ CXG Computachess III from Schachcomputer.info Wiki (German)
6. ^ 6301V from Schachcomputer.info Wiki
7. ^ CXG Star Chess from Schachcomputer.info Wiki
8. ^ Danielsen, Kaare from Schachcomputer.info Wiki
9. ^ Resume for Kaare Danielsen
10. ^ Lexibook Electronic Chess Computers from The Spacious Mind
11. ^ Danielsen, Kaare from Schachcomputer.info Wiki
12. ^ Lexibook Travel Chess Explorer Electronic Chess Computer from The Spacious Mind
13. ^ Lexibook ChessMan Pro Electronic Chess Computer from The Spacious Mind
14. ^ Lexibook Travel Chess from Schachcomputer.info Wiki (German)
15. ^ Budapest 1983 - Chess - Round 1 - Game 2 (ICGA Tournaments)

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