 | Bridge
I'm a member of B.C. Tongelbridge and Bridge Inn.
My bridge interests have caused the
development of the Portable
Bridge Notation, and
the programming of BbnOrganiser
, a program for handling bridge bidding systems.
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| Mathematics
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I developed a nice algorithm to generate figures with hexagonal characteristics: H6X9H.
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I proved that taking a stroll on a sunny day can best be done clockwise: zon.pdf (in Dutch).
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Computation of angles for a (stained glass) lampshade.
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The computation of the spiral center of triangles and quadrilaterals: spiral_center.pdf or
in HTML.
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Four-armed spiral tiling of scalene triangles: four_armed_spiral.pdf or
in HTML.
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Logarithmic spiral tiling of hexagons: hexagon_spiral.pdf or
in HTML.
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T'ai Chi Ch'uan
I'm learning the Yang style of professor Cheng
Man-Ching as taught by Jeannine Geris, see taichibrabant.
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Software engineering
I'm very much interested in the design of software components of
real-time embedded systems from a professional point of view. Refer
to my documents.
Reviewing software and documents is one of my specialties: refer to my
errata.
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| Plexiglas
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I made a water wheel of Plexiglas containing 4 inner wheels.
Click on the picture to see it running chaotically.
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This impossible triangle of Plexiglas cubes is known from Oscar
Reutersvärd. It causes even more confusion if you click
on it and see it rotating.
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| Chess
A long time ago, I was very familiar with chess. In 1980 I have beaten Korchnoi in 22 moves.
I am interested in computer chess, and a member of CSVN.
See also ICGA.
Some time ago, I played two games at chess.com
as RanaCidu.
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| Programming
For hobby purpose I have
made programs for Commodore-64, Amiga 500, Amiga 4000, Java platform.
I made several Android apps, see Projects.
Currently, the focus is on Java application Tissellator, that creates Escheresque images.
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| Dance
Dance Revolution
The ideal game for every age: fitness,
brains, and fun (for 2).
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| Yoyo
I just like playing with a
yoyo, like this guy: 
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| GPS routes
Willingen + map
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| Pokemon Go
RanaCidu Team Mystic (blue).
Best friends with MysteryMoron, WatLeukToch en BlauwTien.
Level 40 @ 25 September 2017.
Level 50 @ 19 August 2023.
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