Exchange the two groups of coins.

# The Jumping Coins

*|*by Edouard Lucas

Oct 28, 2016, 12:36 PM
*|* by Edouard Lucas

Exchange the two groups of coins.

Sep 24, 2016, 5:16 PM
*|* by Serhiy Grabarchuk Jr

Exchange the two diagonals of the square array employing the minimum single-coin sliding moves.

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Event:

Aug 12, 2016, 11:51 AM
*|* by Serhiy Grabarchuk Jr

Move the minimum number of coins to get rid off ALL the right coin angles.

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Event:

Jul 15, 2016, 11:52 PM
*|* by Serhiy Grabarchuk Jr

Convert the necklace into two triangles (“diamonds”), different in size. Three sliding moves are required.

Jul 08, 2016, 11:17 AM
*|* by Serhiy Grabarchuk Jr

Flip the “Olympic Coins” shape as shown in the Goal, performing just six special single-coin moves.

Jun 30, 2016, 11:47 PM
*|* by Serhiy Grabarchuk Jr

Reach the square frame in the Goal position. A move consists of sliding a coin to a new position where it has to touch at least two other coins. Happy 4th of July!

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Jun 23, 2016, 11:56 PM
*|* by Serhiy Grabarchuk

“Unfold” the coin delta in a series of single-coin moves…

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Jun 16, 2016, 11:51 PM
*|* by Serhiy Grabarchuk Jr

By moving one coin at a time, reach the Goal position so that after each move…

Jun 09, 2016, 11:59 PM
*|* by Serhiy Grabarchuk

Eight coins are arranged into 4 rows of three coins each. Move just two coins to get…

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Jun 02, 2016, 11:43 PM
*|* by Serhiy Grabarchuk Jr

Change a stylized “Olympic” pattern into the one shown in the Goal. Single-coin sliding moves to do that.

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May 26, 2016, 11:57 PM
*|* by Serhiy Grabarchuk

Convert the “G” letter into the “O” letter. A move consists of sliding a coin to a new position where it has to touch at least two other coins.

May 19, 2016, 3:45 PM
*|* by Sam Loyd

Nine coins placed in a 3×3 array, produce 8 rows of three coins each – three horizontal rows, three vertical rows and two main diagonals. Move the minimum possible number to…

May 12, 2016, 8:18 PM
*|* by Kobon Fujimura

Fifteen equilateral triangles can be spotted in this arrangement. What is the minimum number of coins to be removed in order to get rid of all the equilateral triangles in it?

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May 05, 2016, 2:15 PM
*|* by Serhiy Grabarchuk Jr

Convert the “W” letter into the “F” letter. A move consists of sliding a coin to a new position where it has to touch at least two other coins.

Apr 28, 2016, 11:54 PM
*|* by Nob Yoshigahara

Convert the “H” letter into the “O” letter – a 3×3 coin square without the central coin. A move consists of sliding a coin to a new position where it has to touch at least two other coins.

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Event:

Apr 21, 2016, 11:16 PM
*|* by Henry E. Dudeney

Turn the two rows of coins into the coin circle in just three moves. A move consists of sliding a coin to a new position where it has to touch at least two other coins.

Apr 14, 2016, 3:49 PM
*|* by Serhiy Grabarchuk Jr

Move just two coins to turn a coin cup upside-down. The restriction is that after each move a moved coin should touch two other ones.