Myrddin

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Myrddin, a Chess Engine Communication Protocol aka WinBoard compliant chess engine by John Merlino. Myrddin started its life in 2009 as a 0x88 engine with rudimentary evaluation based on material and piece-square tables, and was converted to bitboards in 2012 with v0.86. Search is basically alpha-beta with generally conservative extensions and reductions. Myrddin's SEE implementation is based on pseudo-code by Andres Valverde.

=Myrddin 0.87= Myrddin 0.87, released in January 2015, features a lazy parallel search using processes and a shared hash table, based on an idea from Harm Geert Muller.

=Myrddin 0.88= Myrddin 0.88, released in July 2021, is about 110 ELO stronger than v0.87 at 1 CPU and about 100 ELO stronger at 4 CPUs.

=Etymology= The program's name is related to its author's last name Merlino, the Italian equivalent of Merlin, a legendary figure best known as the wizard featured in the Arthurian legend, derived from the Welsh Myrddin, the name of the bard Myrddin Wyllt.

=See also=
 * The King

=Forum Posts=

2009

 * Introducing Myrddin v0.0000001a by John Merlino, CCC, February 24, 2009
 * Myrddin v0.80 Alpha 1 release by John Merlino, CCC, May 09, 2009
 * Myrddin v0.81 Alpha 2 release by John Merlino, CCC, May 29, 2009
 * Myrddin 0.82 release by John Merlino, CCC, September 27, 2009

2010 ...

 * Myrddin 0.83 release by John Merlino, CCC, February 23, 2010
 * Myrddin 0.84 release by John Merlino, CCC, September 20, 2010
 * Myrddin 0.85 release by John Merlino, CCC, May 03, 2011
 * Re: Programmers: what's the story behind the name of your engine by John Merlino, CCC, June 21, 2011
 * Myrddin 0.86 release by John Merlino, CCC, December 22, 2012
 * SMP and pondering by John Merlino, CCC, February 08, 2014 » Parallel Search, Pondering
 * Myrddin 0.87 release by John Merlino, CCC, January 25, 2015

2020 ...

 * Working on Myrddin again by John Merlino, CCC, June 28, 2021
 * Myrddin v0.88 Release by John Merlino, CCC, July 18, 2021

=External Links=

Chess program

 * Myrddin by John Merlino, Computer-Chess Wiki by Ron Murawski
 * Myrddint in CCRL 40/15

Misc

 * Myrddin (disambiguation) from Wikipedia
 * Myrddin Wyllt from Wikipedia
 * Merlin from Wikipedia
 * Mago Merlino from Wikipedia.it (Italian)
 * Prophetiae Merlini from Wikipedia
 * Myrddin & Merlin: A Guide to the Early Evolution of the Merlin Legend from Arthuriana by Thomas Green
 * Theosophy Avalon / Ynys Witrin - The Theosophy Wales King Arthur Pages - Vortigern's Stronghold Dinas Emrys
 * The Myrddin Falcon by Bard Judith
 * The Story of Myrddin Wyllt by Elis Gruffudd, 16th Century
 * Soft Machine - The Tale of Taliesin, from Softs, 1976, YouTube Video
 * Lineup: Roy Babbington, John Etheridge, John Marshall, Karl Jenkins

=References=

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