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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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Puzzle Hits

DualDoku by Peter Grabarchuk
 
DualDoku
by Peter Grabarchuk
One more puzzle of the 2nd World Sudoku Championship held in Prague on March 28 -- April 1, 2007. The big grid consists of two partially overlapped 9x9 sub-grids. All the rules are as in the "standard" Sudoku...
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Puzzle Hits

Slant Numbers by Serhiy Grabarchuk
 
Slant Numbers
by Serhiy Grabarchuk
This is another puzzle of the 2nd World Sudoku Championship held in Prague on March 28 -- April 1, 2007. It was part of the 2WSC play-off. Every square cell of a 6x6 square grid is divided diagonally into two triangle sub-cells (white and gray)...
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Puzzle Hits

Jigsaw-Roundoku by Serhiy Grabarchuk
 
Jigsaw-Roundoku
by Serhiy Grabarchuk
This was the final puzzle of the 2nd World Sudoku Championship held in Prague on March 28 -- April 1, 2007. The goal is to fill in a 9x9 grid assembled of nine jigsaw pieces with numbers 1 through 9 so that "round" numbers (3, 6, 8, and 9) go to the round ears of those jigsaw pieces...
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Puzzles

Puzzles

GAMES Magazine - December, 2006
 
Playing with Puzzle Classics
by Serhiy Grabarchuk
In the December issue, GAMES Magazine publishes my article, Playing with Puzzle Classics, see pages 84-89. It's devoted to different old puzzles with a modern look on them, and contains a lot of interesting puzzle materials I've never published before...
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Puzzles

Puzzles

Seven Puzzles for G4G7 by Serhiy Grabarchuk
 
Seven Puzzles for G4G7
by Serhiy Grabarchuk
The Gathering for Gardner (G4G) is the unique biennial event founded in 1993 by Gardner fan and puzzle collector, Tom Rodgers. Getting together in Atlanta, the World's foremost mathematicians, puzzlers and magicians, deeply influenced by Martin Gardner's work and life, bring with them some writings related to the fields of their interest and prepared specially to honor Martin Gardner...
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Puzzles

Puzzles

Puzzle Classics at G4G7 by Serhiy Grabarchuk
 
Puzzle Classics at G4G7
by Serhiy Grabarchuk
Classic puzzles make a substantial and distinctive part within all puzzles available to puzzlers in different forms, real and virtual. Many of them are well-known, and still they hide a lot of surprises which can lead puzzlers to new and improved solutions, while puzzle creators can come up with new challenges and variations...
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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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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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