Dr. Goetz Schwandtner's Homepage

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Hi, I am Goetz and I am fascinated in all kinds of mechanical puzzles. Browse my collection including some very interesting and exceptional puzzles in my puzzle gallery Extremely Puzzling!

If you are interested in computers and old software, you will find some of my past projects, most of them on legacy platforms no longer supported. One of my first computers was a Casio FX-880P, for which some nice programs I present here.

Last but not least, there are some pictures of some 1:87 scale model buses I built (or modded) many years ago: Model bus gallery.

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Publications:

• A. Arnold, F. Flentge, Ch. Schneider, G. Schwandtner, Th. Uthmann, M. Wache: Team Description Mainz Rolling Brains 2001, In: A. Birk, S. Coradeschi, S. Tadokoro (Eds.): RoboCup-2001. Robot Soccer World Cup V, Springer-Verlag, 2002.
• Diploma Thesis: Multiple Sequence Alignment — Komplexitätstheoretische Betrachtung und Vergleich von Verfahren (in German), and test data (13 MByte)
• Ph.D. Thesis: Datalog on Infinite Structures
  also on this topic: Martin Grohe, Götz Schwandtner: The Complexity of Datalog on Linear Orders, Logical Methods in Computer Science, 5(1), 2009
• Puzzle Paper: Some Thoughts on Jean-Claude Constantin's Kugellager Puzzle
• Puzzle Compendium: Compendium of Chinese-Rings-Like Puzzles — a compendium containing all the puzzles that are related to Chinese Rings, Kugellager, and the so-called "n-ary" puzzles.
  At DCD33 in Voorburg in 2013 I gave a talk about this compendium, you can find the slides here.
• Articles in Cubism for Fun (CFF):
  • Solving Flexible Meshing Puzzles with BurrTools (CFF114, March 2021)
  • Solving Sjaak's Impossible Sliding Puzzle with BurrTools (CFF115, June 2021)
  • Puzzling Aspects of Binary Disk (CFF122, November 2023) Companion Website
  • Phinary Puzzles (with Oskar van Deventer, Hirokazu "Iwahiro" Iwasawa, Bram Cohen; CFF126, March 2025)
  • Talks at GCD (German Cube Day):
    • Exploring the Exploding Twins Cube (GCD 2022)
    • Visit to the Zoo of Burrs (GCD 2024)

My Puzzle Gallery:

Extremely Puzzling
For my IPP32 Exchange puzzle Acrobat there are now additional challenges available.

Some programming experiments:

Software project pages: Java-Fractals, J2ME-Midlets, Python - PyS60, Casio FX-880P

Model buses:

Gallery

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