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an American mathematician, computer scientist and microcomputer chess pioneer. Along with her husband [[Dan Spracklen|Dan]], Kathe started chess programming in 1977 on a [[Z80|Z-80]] based ''Wavemate Jupiter III'' <ref>[http://www.computermuseum.li/Testpage/JupiterII-1975.htm Jupiter II-1975]</ref> in [[Assembly|assembly language]]. Their first program, [[Sargon]] <ref>[https://en.wikipedia.org/wiki/Sargon_%28chess%29 Sargon from Wikipedia]</ref> had a one or two [[Ply|ply]] [[Search|search]] without [[Quiescence Search|quiescence]] but [[Static Exchange Evaluation|exchange evaluation]] <ref>[http://www.andreadrian.de/schach/sargon.asm Sargon Z80 assembly listing] by [[Dan Spracklen|Dan]] and Kathe Spracklen, hosted by [[Andre Adrian]]</ref>. After the success at [[MCCT 1978|The Second West Coast Computer Faire MCCT]] in March 1978, and the shared third place at [[ACM 1978]], the Spracklens became professional computer chess programmers. Sargon II was ported to various early home computers, for instance [[TRS-80]] and [[6502]] based [[Apple II]] <ref>[http://www.c64-wiki.de/index.php/Sargon_II Sargon II] from [http://www.c64-wiki.de/index.php/Hauptseite C64-Wiki] (German)</ref>, as well as [[Dedicated Chess Computers|dedicated units]] as [[Chafitz ARB Sargon 2.5]] <ref>[http://www.schach-computer.info/wiki/index.php/Chafitz_ARB_Sargon_2.5 Chafitz ARB Sargon 2.5]</ref>.