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'''[[Main Page|Home]] * [[Engines]] * Chess (John Krause)'''
[[FILE:VIC-20-Chess.jpg|border|right|thumb|link=https://www.atarimagazines.com/compute/issue55/chess.php| VIC-20 Chess <ref>[[John Krause]] ('''1984'''). ''[https://www.atarimagazines.com/compute/issue55/chess.php CHESS]''. [https://en.wikipedia.org/wiki/Compute! [Compute!]], [https://archive.org/stream/1984-12-compute-magazine/Compute_Issue_055_1984_Dec#page/n89/mode/2up Issue 055]</ref> ]]
'''Chess''',<br/>
a chess program by [[John Krause]], written in [[6502]] [https://en.wikipedia.org/wiki/Machine_code machine language] with versions for [[Commodore VIC-20]] (with at least 8 KiB expansion), [[Commodore 64]], [[Atari 8-bit]] and [[Apple II]],
published and described in the [https://en.wikipedia.org/wiki/Compute! [Compute!]] December 1984 issue. The program was printed in [[Basic]] syntax with machine code in [https://en.wikipedia.org/wiki/BASIC#Data_manipulation Data] statements,
along with a leading read and [https://en.wikipedia.org/wiki/PEEK_and_POKE poke] loop, to read the data and store it as executable code in [[Memory|memory]].
The program applies [[Alpha-Beta|alpha-beta]] with a [[Depth|depth]] from two to six [[Ply|plies]] depending on level 1-5, and a [[Material|material]] only [[Evaluation|evaluation]]
with {1,3,3,5,9}-[[Point Value|point values]]. An improved [[8086]] version of the program for the [[IBM PC]] was published a few months later <ref>[[John Krause]] ('''1985'''). ''[https://www.atarimagazines.com/compute/issue64/chess.php For IBM PC & PCjr CHESS]''. [https://en.wikipedia.org/wiki/Compute! [Compute!]], [https://archive.org/stream/1985-09-compute-magazine/Compute_Issue_064_1985_Sep#page/n88/mode/2up Issue 064]</ref>.
The C64 version was also released in 1986 as '''Chess Master''' by ''FHD Software'' <ref>[http://www.gb64.com/game.php?id=26570&d=18 Chess Master | GB64.COM - C64 Games, Database, Music, Emulation, Frontends, Reviews and Articles]</ref>.
=Publications=
* [[John Krause]] ('''1984'''). ''[https://www.atarimagazines.com/compute/issue55/chess.php CHESS]''. [https://en.wikipedia.org/wiki/Compute! [Compute!]], [https://archive.org/stream/1984-12-compute-magazine/Compute_Issue_055_1984_Dec#page/n89/mode/2up Issue 055]* [[John Krause]] ('''1985'''). ''[https://www.atarimagazines.com/compute/issue64/chess.php For IBM PC & PCjr CHESS]''. [https://en.wikipedia.org/wiki/Compute! [Compute!]], [https://archive.org/stream/1985-09-compute-magazine/Compute_Issue_064_1985_Sep#page/n88/mode/2up Issue 064]
=External Links=
