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Tom Likens,
an American electrical engineer and as AMD employee part of the design team implementing the Zen microarchitecture with the Ryzen series of x86-64 CPUs, first released in March 2017 ^[1]. 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 ^[2]. Tom has been interested in bitboards ever since he read the Atkin and Slate paper on Chess 4.5 ^[3] (circa 1978). He has always had a hardware bent and the elegance of the idea was immediately apparent to him ^[4]. In 2005, Tom was a bit tired of bitboards and learned towards some type of 0x88 and Vector Attacks ^[5] inspired by CCC posts of Christophe Théron ^{[6] [7]}, but finally stuck to bitboards ^[8].

Forum Posts

2000 ...

• Nice Rotated-bitmaps Article by Hyatt in ICCA by Tom Likens, CCC, February 07, 2000 » Rotated Bitboards ^[9]
• Interesting EGTB bug by Tom Likens, CCC, April 16, 2002 » Endgame Tablebases
• How to handle EGTB stalemates by Tom Likens, CCC, March 02, 2003 » Stalemate
• Hamming distance and lower hash table indexing by Tom Likens, CCC, September 02, 2003
• Evaluation-based Reductions and/or Extensions by Tom Likens, CCC, December 28, 2003 » Extensions, Reductions
• Implementing Planning in an Engine by Tom Likens, CCC, February 04, 2004 » Planning
• Time to implement Learning by Tom Likens, CCC, February 26, 2004 » Learning
• Evaluating Pinned Pieces by Tom Likens, CCC, May 19, 2004 » Pin

2005 ...

• Open Sourcing your Engine by Tom Likens, Winboard Forum, October 05, 2005
• Move ordering at different (Knuth) node types by Tom Likens, Winboard Forum, February 21, 2006 » Move Ordering, Node Types
• Compact Bitboard Attacks by Tom Likens, Winboard Forum, March 14, 2006 » Kindergarten Bitboards
• New version of Djinn 0.920 (Windows 32 & Linux 32/64) by Tom Likens, Winboard Forum, March 21, 2006

2010 ...

• Djinn 0.969 Released (64-bit + 32-bit) by Tom Likens, CCC, October 20, 2012
• How Do You Automatically Tune Your Evaluation Tables by Tom Likens, CCC, January 07, 2014 » Automated Tuning

2015 ...

• Re: AMD's Ryzen launches March 2, outperforming Intel's Core by Tom Likens, CCC, February 28, 2017 » AMD

External Links

• Djinn
• Computer chess techniques
• Booklist

References

1. ^ Re: AMD's Ryzen launches March 2, outperforming Intel's Core by Tom Likens, CCC, February 28, 2017
2. ^ Djinn by Tom Likens
3. ^ David Slate and Larry Atkin (1977). CHESS 4.5 - The Northwestern University Chess Program. Chess Skill in Man and Machine (ed. P.W. Frey), pp. 82-118. Springer-Verlag, New York, N.Y. 2nd ed. 1983. ISBN 0-387-90815-3. Reprinted (1988) in Computer Chess Compendium
4. ^ Technical Overview
5. ^ Open Sourcing your Engine by Tom Likens, Winboard Forum, October 05, 2005
6. ^ Re: Question:1.hashtable 2.board 3.C by Christophe Théron, CCC, June 13, 2000
7. ^ 0x88 is not so smart by Christophe Théron, CCC, June 13, 2000
8. ^ Computer chess techniques
9. ^ Robert Hyatt (1999). Rotated Bitmaps, a New Twist on an Old Idea. ICCA Journal, Vol. 22, No. 4

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