LogiChess

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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 KiB 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) and two World Microcomputer Chess Championships in 1981 and 1983, at times supported by Hartvig Ekner.

=SciSys & CXG= As dedicated chess computer, LogiChess was sold in approximately 200.000 units from SciSys as SciSys Explorer, SciSys Concord II and SciSys Companion II, and from RadioShack as Tandy 1650. Another 4K branch was realized for Newcrest Technology, for the 6800 instruction set compatible [https://en.wikipedia.org/wiki/Hitachi_Ltd. Hitachi] HD6301V1 8-bit controller for the CXG Computachess III in 1984, as well the Newcrest 6301V inside the CXG Star Chess of 1985. According to its author, LogiChess is still the strongest 4K chess computer in the world.

=Lexibook= The Motorola 6800 LogiChess branch was still in production in the 2000s, as used in all the Lexibook computers with 68HC08 compatible microcontrollers.

=Selected Games= WMCCC 1983, round 1, 65 Cyrus X - LogiChess 2.2 [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=

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