Mephisto Lyon

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Mephisto Lyon, a set of dedicated chess computer modules by Hegener & Glaser for their Mephisto module systems with a program by Richard Lang, the successor of Mephisto Portorose. After Lang's sixth consecutive World Microcomputer Chess Championship title as member of the Mephisto team at the WMCCC 1990 in Lyon, the modules were released in late 1990. Notable was the draw by reputation versus runner-up Échec 1.9. Already earlier in November 1990, the Lyon had its debut at ACM 1990, becoming co-champion shared with Deep Thought. It further played the Harvard Cup 1991 with less success, and the Aegon 1991.

=Improvements= Improvements of the Mephisto Lyon over the Portorose were due to an enhanced selective search with narrower but deeper search trees, the application of singular extensions, and capture extensions if entering the pawn endgame. Further, Mephisto Lyon has more knowledge to distinguish strong versus weak passed pawns, and the opening book was further extended to more than 100,000 moves within 13,000 variations.

=Versions= Three Lyon versions were shipped - with 68000 and 68020 processor, and the limited edition Mephisto Lyon Tournament machines with 68030 processor.

=See also=
 * Demonology
 * Draw by Reputation
 * Mephisto Portorose
 * Mephisto Vancouver

=Publications=
 * Eric Hallsworth (1991). The New Mephisto Lyon. Selective Search 32, pp 17, pdf hosted by Mike Watters

=Forum Posts=
 * Collectors Corner: Mephisto Lyon 68000 v. Novag Star Diamond by Chuck, CCC, November 14, 2005 » Novag Star Diamond
 * Master chess v.s Emulated mephisto Lyon by Ricardo Rodulfo, Hiarcs Forum, February 10, 2012
 * Figurensatz Mephisto Lyon abzugeben by Ingo Althöfer, CSS Forum, August 05, 2015 (German)

=External Links=
 * Mephisto's ICGA Tournaments (including Lyon)
 * Comp Mephisto Lyon chess games - 365Chess.com
 * Mephisto Munchen Lyon 68020 from Chess Computer UK by Mike Watters
 * Mephisto Almeria Turniermaschine from Chess Computer UK by Mike Watters » Mephisto Almeria
 * Module Lyon16 Bit from The Spacious Mind
 * Module Lyon32 Bit from The Spacious Mind
 * The 3-Hirn Setting and its Variants in Chess by Ingo Althöfer
 * Mephisto Lyon 68000 from Schachcomputer.info Wiki (German)
 * Mephisto Lyon 68020 from Schachcomputer.info Wiki (German)
 * Mephisto TM Lyon from Schachcomputer.info Wiki (German)
 * Mephisto Lyon from Kurt´s Schachcomputer Homepage by Kurt Kispert (German)
 * Lyon 68020 Games - vm1991.pgn by Kurt Utzinger (German)

=References=

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