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'''[[Main Page|Home]] * [[People]] * Tom Likens'''
'''Tom Likens''',<br/>
an American electrical engineer and as [[AMD]] employee part of the design team implementing the [https://en.wikipedia.org/wiki/Zen_(microarchitecture) Zen microarchitecture] with the [https://en.wikipedia.org/wiki/Ryzen Ryzen] series of [[x86-64]] CPUs, first released in March 2017 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=63246&start=20 Re: AMD's Ryzen launches March 2, outperforming Intel's Core] by [[Tom Likens]], [[CCC]], February 28, 2017</ref>.
As computer chess programmer, Tom Likens is author of the [[Chess Engine Communication Protocol]] compatible chess engine [[Djinn]], which was his third attempt to write a chess program.
Tom Likens has been interested in [[Bitboards|bitboards]] ever since he read the [[Larry Atkin|Atkin]] and [[David Slate|Slate]] paper on [[Chess (Program)#Chess 4.0 - 4.9|Chess 4.5]] <ref>[[David Slate]], [[Larry Atkin]] ('''1977'''). ''Chess 4.5 - The Northwestern University Chess Program.'' [[Chess Skill in Man and Machine]], reprinted (1988) in [[Computer Chess Compendium]]</ref> (circa 1978).
In 2005, Tom was a bit tired of bitboards and learned towards some type of [[0x88]] and [[Vector Attacks]] <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?t=3624 Open Sourcing your Engine] by [[Tom Likens]], [[Computer Chess Forums|Winboard Forum]], October 05, 2005</ref> inspired by [[CCC]] posts of [[Christophe Théron]] <ref>[https://www.stmintz.com/ccc/index.php?id=114377 Re: Question:1.hashtable 2.board 3.C] by [[Christophe Théron]], [[Computer Chess Forums|CCC]], June 13, 2000</ref> <ref>[https://www.stmintz.com/ccc/index.php?id=114438 0x88 is not so smart] by [[Christophe Théron]], [[Computer Chess Forums|CCC]], June 13, 2000</ref>, but finally stuck to bitboards.
=Forum Posts=
==2000 ...==
* [https://www.stmintz.com/ccc/index.php?id=95468 Nice Rotated-bitmaps Article by Hyatt in ICCA] by [[Tom Likens]], [[CCC]], February 07, 2000 » [[Rotated Bitboards]] <ref>[[Robert Hyatt]] ('''1999'''). ''Rotated Bitmaps, a New Twist on an Old Idea''. [[ICGA Journal#22_4|ICCA Journal, Vol. 22, No. 4]]</ref>
* [https://www.stmintz.com/ccc/index.php?id=224008 Interesting EGTB bug] by [[Tom Likens]], [[CCC]], April 16, 2002 » [[Endgame Tablebases]]
* [https://www.stmintz.com/ccc/index.php?id=287563 How to handle EGTB stalemates] by [[Tom Likens]], [[CCC]], March 02, 2003 » [[Stalemate]]
* [https://www.stmintz.com/ccc/index.php?id=313807 Hamming distance and lower hash table indexing] by [[Tom Likens]], [[CCC]], September 02, 2003
* [https://www.stmintz.com/ccc/index.php?id=338851 Evaluation-based Reductions and/or Extensions] by [[Tom Likens]], [[CCC]], December 28, 2003 » [[Extensions]], [[Reductions]]
* [https://www.stmintz.com/ccc/index.php?id=347144 Implementing Planning in an Engine] by [[Tom Likens]], [[CCC]], February 04, 2004 » [[Planning]]
* [https://www.stmintz.com/ccc/index.php?id=351488 Time to implement Learning] by [[Tom Likens]], [[CCC]], February 26, 2004 » [[Learning]]
* [https://www.stmintz.com/ccc/index.php?id=366095 Evaluating Pinned Pieces] by [[Tom Likens]], [[CCC]], May 19, 2004 » [[Pin]]
==2005 ...==
* [http://www.open-aurec.com/wbforum/viewtopic.php?t=3624 Open Sourcing your Engine] by [[Tom Likens]], [[Computer Chess Forums|Winboard Forum]], October 05, 2005
* [http://www.open-aurec.com/wbforum/viewtopic.php?t=4384 Move ordering at different (Knuth) node types] by [[Tom Likens]], [[Computer Chess Forums|Winboard Forum]], February 21, 2006 » [[Move Ordering]], [[Node Types]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?t=4523 Compact Bitboard Attacks] by [[Tom Likens]], [[Computer Chess Forums|Winboard Forum]], March 14, 2006 » [[Kindergarten Bitboards]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?t=4566 New version of Djinn 0.920 (Windows 32 & Linux 32/64)] by [[Tom Likens]], [[Computer Chess Forums|Winboard Forum]], March 21, 2006
==2010 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=45662 Djinn 0.969 Released (64-bit + 32-bit)] by [[Tom Likens]], [[CCC]], October 20, 2012
* [http://www.talkchess.com/forum/viewtopic.php?t=50823 How Do You Automatically Tune Your Evaluation Tables] by [[Tom Likens]], [[CCC]], January 07, 2014 » [[Automated Tuning]]
==2015 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=63246&start=20 Re: AMD's Ryzen launches March 2, outperforming Intel's Core] by [[Tom Likens]], [[CCC]], February 28, 2017 » [[AMD]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=63951&start=20 Re: My New AMD Rzyen 1800X System] by [[Tom Likens]], [[CCC]], May 12, 2017
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=63564&start=84 Re: Ryzen tips] by [[Tom Likens]], [[CCC]], May 15, 2017
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71208&start=36 Re: buying a new computer] by [[Tom Likens]], [[CCC]], July 09, 2019
=References=
<references />
'''[[People|Up one Level]]'''
[[Category:Chess Programmer|Likens]]
'''Tom Likens''',<br/>
an American electrical engineer and as [[AMD]] employee part of the design team implementing the [https://en.wikipedia.org/wiki/Zen_(microarchitecture) Zen microarchitecture] with the [https://en.wikipedia.org/wiki/Ryzen Ryzen] series of [[x86-64]] CPUs, first released in March 2017 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=63246&start=20 Re: AMD's Ryzen launches March 2, outperforming Intel's Core] by [[Tom Likens]], [[CCC]], February 28, 2017</ref>.
As computer chess programmer, Tom Likens is author of the [[Chess Engine Communication Protocol]] compatible chess engine [[Djinn]], which was his third attempt to write a chess program.
Tom Likens has been interested in [[Bitboards|bitboards]] ever since he read the [[Larry Atkin|Atkin]] and [[David Slate|Slate]] paper on [[Chess (Program)#Chess 4.0 - 4.9|Chess 4.5]] <ref>[[David Slate]], [[Larry Atkin]] ('''1977'''). ''Chess 4.5 - The Northwestern University Chess Program.'' [[Chess Skill in Man and Machine]], reprinted (1988) in [[Computer Chess Compendium]]</ref> (circa 1978).
In 2005, Tom was a bit tired of bitboards and learned towards some type of [[0x88]] and [[Vector Attacks]] <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?t=3624 Open Sourcing your Engine] by [[Tom Likens]], [[Computer Chess Forums|Winboard Forum]], October 05, 2005</ref> inspired by [[CCC]] posts of [[Christophe Théron]] <ref>[https://www.stmintz.com/ccc/index.php?id=114377 Re: Question:1.hashtable 2.board 3.C] by [[Christophe Théron]], [[Computer Chess Forums|CCC]], June 13, 2000</ref> <ref>[https://www.stmintz.com/ccc/index.php?id=114438 0x88 is not so smart] by [[Christophe Théron]], [[Computer Chess Forums|CCC]], June 13, 2000</ref>, but finally stuck to bitboards.
=Forum Posts=
==2000 ...==
* [https://www.stmintz.com/ccc/index.php?id=95468 Nice Rotated-bitmaps Article by Hyatt in ICCA] by [[Tom Likens]], [[CCC]], February 07, 2000 » [[Rotated Bitboards]] <ref>[[Robert Hyatt]] ('''1999'''). ''Rotated Bitmaps, a New Twist on an Old Idea''. [[ICGA Journal#22_4|ICCA Journal, Vol. 22, No. 4]]</ref>
* [https://www.stmintz.com/ccc/index.php?id=224008 Interesting EGTB bug] by [[Tom Likens]], [[CCC]], April 16, 2002 » [[Endgame Tablebases]]
* [https://www.stmintz.com/ccc/index.php?id=287563 How to handle EGTB stalemates] by [[Tom Likens]], [[CCC]], March 02, 2003 » [[Stalemate]]
* [https://www.stmintz.com/ccc/index.php?id=313807 Hamming distance and lower hash table indexing] by [[Tom Likens]], [[CCC]], September 02, 2003
* [https://www.stmintz.com/ccc/index.php?id=338851 Evaluation-based Reductions and/or Extensions] by [[Tom Likens]], [[CCC]], December 28, 2003 » [[Extensions]], [[Reductions]]
* [https://www.stmintz.com/ccc/index.php?id=347144 Implementing Planning in an Engine] by [[Tom Likens]], [[CCC]], February 04, 2004 » [[Planning]]
* [https://www.stmintz.com/ccc/index.php?id=351488 Time to implement Learning] by [[Tom Likens]], [[CCC]], February 26, 2004 » [[Learning]]
* [https://www.stmintz.com/ccc/index.php?id=366095 Evaluating Pinned Pieces] by [[Tom Likens]], [[CCC]], May 19, 2004 » [[Pin]]
==2005 ...==
* [http://www.open-aurec.com/wbforum/viewtopic.php?t=3624 Open Sourcing your Engine] by [[Tom Likens]], [[Computer Chess Forums|Winboard Forum]], October 05, 2005
* [http://www.open-aurec.com/wbforum/viewtopic.php?t=4384 Move ordering at different (Knuth) node types] by [[Tom Likens]], [[Computer Chess Forums|Winboard Forum]], February 21, 2006 » [[Move Ordering]], [[Node Types]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?t=4523 Compact Bitboard Attacks] by [[Tom Likens]], [[Computer Chess Forums|Winboard Forum]], March 14, 2006 » [[Kindergarten Bitboards]]
* [http://www.open-aurec.com/wbforum/viewtopic.php?t=4566 New version of Djinn 0.920 (Windows 32 & Linux 32/64)] by [[Tom Likens]], [[Computer Chess Forums|Winboard Forum]], March 21, 2006
==2010 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=45662 Djinn 0.969 Released (64-bit + 32-bit)] by [[Tom Likens]], [[CCC]], October 20, 2012
* [http://www.talkchess.com/forum/viewtopic.php?t=50823 How Do You Automatically Tune Your Evaluation Tables] by [[Tom Likens]], [[CCC]], January 07, 2014 » [[Automated Tuning]]
==2015 ...==
* [http://www.talkchess.com/forum/viewtopic.php?t=63246&start=20 Re: AMD's Ryzen launches March 2, outperforming Intel's Core] by [[Tom Likens]], [[CCC]], February 28, 2017 » [[AMD]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=63951&start=20 Re: My New AMD Rzyen 1800X System] by [[Tom Likens]], [[CCC]], May 12, 2017
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=63564&start=84 Re: Ryzen tips] by [[Tom Likens]], [[CCC]], May 15, 2017
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71208&start=36 Re: buying a new computer] by [[Tom Likens]], [[CCC]], July 09, 2019
=References=
<references />
'''[[People|Up one Level]]'''
[[Category:Chess Programmer|Likens]]
