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The Holey Square Family by Serhiy Grabarchuk
 
The Holey Square Family  
by Serhiy Grabarchuk
One of the simplest geometric paradoxes with vanishing areas was described by Martin Gardner in his classic book, Mathematics, Magic and Mystery, in 1956. The paradox is more than two centuries old, but it still attracts attention of puzzlers, mathematicians, and magicians. And that is why there are dozens of different variations based on its principle...
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Puzzles

Puzzles

The Tangramion by Serhiy Grabarchuk
 
The Tangramion
by Serhiy Grabarchuk
This is a new assembling puzzle consisting of seven two-sided tiles which initially form a perfect square. Using all the seven tiles, you can solve different challenges both entertaining and cognitive...
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Games

Games

Loyd, Dudeney and... Galactic Takeover by Serhiy Grabarchuk
 
Loyd, Dudeney and... Galactic Takeover
by Serhiy Grabarchuk
It's amusing to see how things that were interesting to puzzlers many decades ago look fresh and attractive today. Of course, they were presented in a somewhat different manner, but their core is still appealing to their solvers...
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Sliding Block Puzzles

Sliding Block Puzzles

How to Outwit the Parity by Serhiy Grabarchuk
 
How to Outwit the Parity
by Serhiy Grabarchuk
Everyone who has ever tried to solve Loyd's "14-15" puzzle very soon felt some invisible force that prevents to solve the puzzle. And this force is so stubborn, so strong that one might continue attempts to eternity without success. The name of this force is the Parity...
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Dissection Puzzles

Dissection Puzzles

Two Oval Stools to a Table by Serhiy Grabarchuk
 
Two Oval Stools to a Table
by Serhiy Grabarchuk
This well-known, classic puzzle with transformation of two oval stools into a circular table top has long and interesting history. More than 180 years ago, in 1821, John Jackson posed in his book Rational Amusement for Winter Evenings a puzzle how to transform a circle into two hollow ovals...
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Last Updated: September 29, 2011
Posted: August 16, 2005
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