Date: Thu, 13 Oct 94 02:55:05 +0100
From: Dik T. Winter <Dik.Winter@cwi.nl >
~~~ ~~~ Subject: CFF 34, summary of contents

CFF #34 came out, it ought to have been in June but is a bit late.
Still, the editors expect the next issue in December.

Summary of contents.

Leo Links: On Folding Puzzles.
A discussion about folding puzzles made from paper or cardboard
that display a particular figure or text when folded.

Frits Goebel and Bernhard Wiezorke: Problems for Einstein.
They discuss a puzzle consisting of 8 octonimo's which is marketed
as IQ CREATOR, MAGIC BLOCK or EINSTEIN PUZZLE. They show a few
pretty patterns that can be formed with the 8 pieces.

Vic Stok: Skyline Tetracubes.
This discusses figures that can be formed from the 8 different
pieces consisting of 4 cubes glued together.

Jacques Haubrich and Nanco Bordewijk: Cube Chains.
This discusses a number of puzzles. Each consists of 27 cubes
connected to each other by an elastic string. The objective is
to form a 3x3x3 cube.

Bernhard Wiezorke: On Nob's L-Puzzle.
This duscusses Nob's puzzle. It consists of 10 L shaped pieces,
3 squares high, 2 squares wide; all in the same orientation, one
such piece 4 squares high (also the same orientation) and one
3 square high piece in different orientation (i.e. turned over).
The objective is to fill a 7x7 square, turnover of the pieces is
not permitted.

Jacques Haubrich: Pantactic Patterns and Puzzles.
This discusses an extension of the memory wheel. On the wheel
the digits 0 and 1 are written such that when you look at 3
consecutive digits, all 8 different can be created. This can
be generalized to n consecutive digits. It is well known (since
N.G. de Bruijn) that 2^n digits are needed. An 2-dimensional
extension was made by B. Astle who had a 5x5 square with a
black-white pattern such that when you look at the 16 different
2x2 subsquares you will find all 16 different configurations.
C.J. Bouwkamp made this into a puzzle (in the early 70's) as
follows: You have 16 2x2 squares with all possible patterns.
The puzzle is to put them together in a larger square such that
the borders match. Rotation is *not* permitted.

Torsten Sillke: Three 3x3 Matching-Puzzles.
A discussion about three puzzles consisting of 9 squares that
have to be put in a 3x3 square where some form of marking has
to match.

Jacques Haubrich: Cube 216.
The puzzle Gemini consists of 10 pieces where each piece is
made by joining two 1x2x2 blocks together. This is done in
all possible ways. It is known that there are 50 possible
ways to pack them in a 4x4x5 block. Yoshikatsu Hara extended
this with 22 pieces that form all possible ways to join two
1x3x3 blocks together. One result is that there are (at
least) 11 selections of 12 of these pieces so that they can
be packed in a 6x6x6 cube in an unique way. There are more
results and the author asks also for input.

Chris Roothart: Polylambdas.
Polylambdas are formed from the 30/60/90 degree triangle.
Lambdas can be joined at corresponding edges. Joining
along the hypothenusa is not allowed. There are 4 dilambdas,
4 trilambdas, 11 tetralambdas en 12 pentalambdas. These 31
pieces can fill a parallelogram of 4 by 31 units (the short
leg is the unit). Many other problems are stated.

Columns:

Mark Peters: Books and Magazines (book reviews)
Edward Hordern: What's Up? (details some new puzzles)
------
CFF (Cubism For Fun) is the newsletter published by the
Nederlands Kubus Club NKC (Dutch Cubists Club).

Membership fee is NLG 25 individual, NLG 80 institutional.
(USD 1 ~ NLG 1.70). Applications for membership to the
treasurer:
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The Netherlands