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Home * Engines * LogiChess

the first chess program by Kaare Danielsen developed in 1981 for the Z80 processor. 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 4K dedicated chess computer program, LogiChess was ported to the 6800 instruction set compatible Hitachi HD6301V1 and Newcrest 6301 8-bit controllers. It 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 [5] branch was realized for Newcrest Technology, for the CXG Computachess III in 1984 [6], as well 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].


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

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