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The Checkered Origami I-Square

Checkered Patterns

by Serhiy Grabarchuk


An Origami square.


One hundred and nine 2x2 checkered patterns.
This is another square version of the Origami Checkerboard puzzle. It uses a traditional square Origami sheet of paper colored just on one of its sides.

You have one hundred and nine 2x2 checkered patterns formed with small isosceles triangles; these patterns are shown in the diagrams in this page.* Your challenge is to achieve every of them in the minimum of single "book" folds; see a sample. The final shape every time is a flat square; no matter what pattern will be at its back. Write us about your minimal solutions to these patterns. All the best results will be posted.

Even much more difficult challenges can be finding all the 3-unit-side checkered square patterns formed with small isosceles triangles, and their minimal solutions.
*) A puzzle with Pattern 11 was described by Nob Yoshigahara in his PUZZLETOPIA Special in 1992 with the credit to Diego Uribe of Argentina. There is a 4-fold solution to Pattern 11.

I've presented my puzzle with Pattern 108 in my new puzzle book
The New Puzzle Classics: Ingenious Twists on Timeless Favorites published by Sterling Publishing Co., Inc. as a Mensa Official Puzzle Book, and officially released on May 1, 2005.
Last Updated: October 14, 2008
Posted: September 4, 2005
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