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Rxb8 34.Qxb8+ Kh7 35.Qxd6 Rc8 36.a4 Rc4 37.Qd7 1-0
</pre>
In the actual game, Deep Thought improved with 6... Nf6, but later played the weak 13... f6. However, instead of 14. Be6!, HiTech, made a terrible mistake, it starts to use its own head <ref>[https://en.wikipedia.org/wiki/Larry_Evans Larry Evans] ('''1989'''). ''The Key Game''. [[ICGA Journal#12_4|ICCA Journal, Vol. 12, No. 4]], pp. 244, annotated [[HitechHiTech]] versus [[Deep Thought]] game</ref> * [https://lichess.org/PCxjp5TN View this game on Lichess.org]
<pre>
[Event "ACM 1989"]
26.Qxh7 Qa5+ 27.Ke2 Rd6 28.Qh5+ Kd8 29.Qxg5 Bh6 30.Qg8+ Kc7 0-1
</pre>
* [https://lichess.org/FaPK9lac View this game on Lichess.org]
==Round 5 Surprise==
[[FILE:5-3.Campbell_Hsu_Berliner.ACM_20_NACCC.Reno.1989.102645329.NEWBORN.lg.jpg|none|border|text-bottom|link=http://www.computerhistory.org/chess/full_record.php?iid=stl-430b9bbd30c91]]
[[Hans Berliner]] (rear), [[Murray Campbell]] and [[Feng-hsiung Hsu]], ACM '89 <ref>[http://www.computerhistory.org/chess/full_record.php?iid=stl-430b9bbd30c91 Hans Berliner (rear), Murray Campbell (front, left) and Feng-Hsiung Hsu at the 20th annual ACM Computer Chess Championship in Reno, Nevada] 1989, Gift of [[Monroe Newborn]], [[The Computer History Museum]]</ref> <ref>[https://www.stmintz.com/ccc/index.php?id=404162 Re: Which Mephisto Version Beat Deep Thought?] by [[Steve Blincoe|Steve B]], [[CCC]], January 04, 2005</ref>
<pre>
[Event "ACM 1989"]
62.Kd3 a4 63.Kc3 Kc5 64.f5 1-0
</pre>
* [https://lichess.org/jYOb4Q5J View this game on Lichess.org]
[[FILE:4-3_3-1.Richard_Lang_ACM_20_NACCC_Reno_1989.102645339.NEWBORN.lg.jpg|none|border|text-bottom|link=http://www.computerhistory.org/chess/full_record.php?iid=stl-430b9bbd619d1]]
=Forum Posts=
* [http://groups.google.com/group/rec.games.chess/browse_frm/thread/457406aed770f6be Aegon Tournament 1990; Hitech best overall] by [[Hans Berliner]], [[Computer Chess Forums|rgc]], May 25, 1990 » [[Aegon 1990]]
* [https://www.stmintz.com/ccc/index.php?id=404162 Re: Which Mephisto Version Beat Deep Thought?] by [[Steve Blincoe|Steve B]], [[CCC]], January 04, 2005 » [[Mephisto|Mephisto X]]
=External Links=
'''[[ACM North American Computer Chess Championship|Up one level]]'''
[[Category:1989]]
