During the last round game at the EMCC 1983, Chess 2001 vs. Caesar, to the delight of its operator David Levy, Chess 2001 played 32.Kh2 leaving Caesar in Zugzwang with a drastic demonstration of the horizon effect. Instead of facing the inevitable and giving up the defence of the knight, Black tries to save it by sacrificing no less than four pawns: 32... g4 33.Bxg4 f5 34.Bxf5 a5 35.bxa5 b4 36.cxb4 Rg8 [3]
2kr4/3nR3/p2B1p2/1p1p1Bp1/1P1P3p/2P4P/P5P1/6K1 w - - 0 32
an early microcomputer chess program written by John Lowe, apparently in Z80 assembly. Caesar played the 2nd European Microcomputer Chess Championship in 1981, and the 4th European Microcomputer Chess Championship 1983 in London, running on a TRS-80 [1].
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Horizon Effect
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