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=Kasparov - Ribli=
The first one of Botvinnik's ''Three Positions'' <ref>[[Mikhail Botvinnik]] ('''1993'''). ''Three Positions''. [[ICGA Journal#16_2|ICCA Journal, Vol. 16, No. 2]]</ref> and most criticized analysis is from the [https://en.wikipedia.org/wiki/Garry_Kasparov [Garry Kasparov]] vs. [https://en.wikipedia.org/wiki/Zolt%C3%A1n_Ribli Zoltán Ribli] game <ref>[http://www.chessgames.com/perl/chessgame?gid=1070471 Garry Kasparov vs Zoltan Ribli (1989)] from [http://www.chessgames.com/index.html chessgames.com]</ref>, [https://en.wikipedia.org/wiki/Skellefte%C3%A5 Skellefteå] [https://en.wikipedia.org/wiki/1989_in_chess#Grandmasters_Association_World_Cup World Cup 1989] <ref>[http://www.chessgames.com/perl/chesscollection?cid=1015939 Skelleftea World Cup 1989] from [http://www.chessgames.com/index.html chessgames.com]</ref>, after 26.Rxb5 Bxe3 <ref>[https://www.stmintz.com/ccc/index.php?id=46260 Kasparov-Ribli, 1989] by [[Bruce Moreland]], [[CCC]], March 19, 1999</ref> <ref>[https://www.stmintz.com/ccc/index.php?id=201865 Test position ==> Kasparov-Ribli,1989] by [[José Antônio Fabiano Mendes]], [[CCC]], December 14, 2001</ref>:
<fentt border="double" style="font-size:24pt">5rk1/5ppp/p1Q1p3/1R6/q7/4b1P1/P2RPP1P/6K1</fentt>
CC Sapiens produced an analysis of a mere 18 nodes, and determined that this position is a win for White with Rd8. Botvinnik gives one variation with 1.Rd8! Qxb5 2.Qd6! Bxf2 3.Kxf2 Re8 4.Qe7, satisfying the stated goal, but missed to consider other alternatives of Black's first (1... Bxf2) and third move. Berliner: "Presumably the beckoning 3. ...Qf5+ is dismissed since it can't possibly lead to a win for Black. Botvinnik knows that, and I know that, but can a computer program figure this out without searching?". The blunder 4.Qe7 was apparently discovered by Botvinnik or his team just before press time, given in a footnote, but due to mistake of the editors, three pages apart.
[[Feng-hsiung Hsu]], who already analyzed the position with [[Deep Thought]] along with Gary [[Garry Kasparov ]] in 1990, posted the winning lines of 3. ... Re8 4.a4 or more difficult 3 ...Qf5+! 4.Kg1! in [[Computer Chess Forums|rgc]] <ref>[https://groups.google.com/d/msg/rec.games.chess/xsgbuxorOZ8/nZWR2BkOlFsJ Re: Kasparov missed Beautiful win; Botvinnik's Program muffs analysis] by [[Feng-hsiung Hsu]], [[Computer Chess Forums|rec.games.chess]], July 10, 1993</ref> as reply to Berliner's [[B*]] [[HiTech]] analysis with the wrong 3 ...Qf5+! 4.Kg2 line <ref> [http://groups.google.com/group/rec.games.chess/browse_frm/thread/c6c81bbb1a2b399f# Kasparov missed Beautiful win; Botvinnik's Program muffs analysis] by [[Hans Berliner]], [[Computer Chess Forums|rec.games.chess]], July 9, 1993</ref>. As admitted by Berliner in his ''Playing Computer Chess in the Human Style'' [[ICCA]] correspondence <ref> [[Hans Berliner]] ('''1993'''). ''Playing Computer Chess in the Human Style''. [[ICGA Journal#16_3|ICCA Journal, Vol. 16, No. 3]]</ref>, it was possible to identify a serious bug in B* HiTech's [[Search|search]] algorithm thanks to Hsu's information.
=Solving Shannon's Problem=
