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 Post subject: Coin "15" (Fifteen) Puzzle
PostPosted: Fri Oct 26, 2012 4:13 pm 

Joined: Tue Oct 13, 2009 1:13 am
Location: Saint-Petersburg, Russia

There is well known Fifteen puzzle. This puzzle is not very difficult and
I wanted to make more challenged one. There were several attempts
and now I would like to present my Coin "15" Puzzle. I glued several
coins on the pieces, and this added new restriction: you cannot put
together two pieces with coins.

Video:: Coin "15" Puzzle

On the first picture you can see the simplest version: it is not too hard
to solve, but it's tricky. The latest version is very hard, the second has
middle level.

I used the following Russian and Soviet coins:

"2" is 2 Russian rubles
"5" is 5 Russian kopecks
"7" is the reverse of 1 Russian ruble
"10" is 10 Russian rubles
"13" is the reverse of 50 Russian kopecks
"15" is Soviet 15 kopecks

Also I put 1 Russian kopeck (not visible on the pictures) between
each piece and coin to make sliding smooth.

Note that all coins, except 15 kopecks, are in circulation now,
but 1 and 5 kopecks are almost out of circulation.

Why I use 50 kopecks for "13"? On the reverse of the coin you can
see Saint George, the slayer of dragons, and the length of that
dragon is 13 meters! Therefore I chose this coin.

Why I use the reverse of 1 ruble for "7"? H-mm... I don't know :)

You can make your own national version of this puzzle, use coins
of your country and you will get new interesting version! Enjoy!

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PA221709.JPG [ 103.8 KiB | Viewed 1131 times ]
 Post subject: Re: Coin "15" (Fifteen) Puzzle
PostPosted: Fri Oct 26, 2012 10:04 pm 
User avatar

Joined: Mon Apr 03, 2006 10:38 am
Location: Connecticut
Nice idea.

Hanayama has issued puzzles having a similar principle - some juxtapositions of pieces result in blocked moves - kind of the 2D analogue of "overhang bandaging."


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