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=Igor II=
A second Igor model, Igor 711E-2, using a [https://en.wikipedia.org/wiki/Samsung_Electronics Samsung] KS57C2308 controller with a [[SAM|SAM47]] 4-bit core at 1 MHz with 8 KiB ROM and 512 [[Nibble|nibbles]] of RAM <ref>[https://www.datasheets360.com/pdf/2733143681578461097 KS57C2308 PDF Datasheet - Samsung Semiconductor Division - Datasheets360.com]</ref> was released in 2000 <ref>[http://www.hiarcs.net/forums/viewtopic.php?t=7591&start=8 Chess Products Ron Nelson designed/programmed] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], January 11, 2016</ref>.
The 4-bit program, based on the [[Excalibur LCD Chess]] code, used sophisticated [[PV-Move|PV move]] and [[Killer Move|killer move]] [[Move Ordering|ordering heuristics]] <ref>[http://www.hiarcs.net/forums/viewtopic.php?t=6768&start=102 Ron Nelson] by [[Ron Nelson|ChessChallenger]], [[Computer Chess Forums|Hiarcs Forum]], December 23, 2015</ref>,
but was of course a weaker program than the original 8-bit Igor <ref>[https://www.schach-computer.info/wiki/index.php/Excalibur_Igor Excalibur Igor] - [https://www.schach-computer.info/wiki/index.php?title=Hauptseite_En Schachcomputer.info Wiki] (German)</ref>.
'''[[Engines|Up one level]]'''
[[Category:H8]]
[[Category:SAM47SAM]]
[[Category:Commercial]]
[[Category:Dedicated]]
