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Sliding pennies #2 (Posted on 2005-06-06) Difficulty: 3 of 5
Nine pennies are arranged in the pattern below.

  O O O
 O O O
O O O

nearby pennies touching. By the fewest number of legal moves, transform the pattern into the pattern

   O
  O O
 O   O
O O O O

nearby pennies touching. A legal move consists of sliding a penny, not picking up a penny, without disturbing the other pennies, to a new position touching at least two pennies.

  Submitted by McWorter    
Rating: 3.0000 (3 votes)
Solution: (Hide)
We label the pennies and show their position after each of 4 moves.
                               9          9          9
        1 2 3      1 2 3      1 2 3      1 2 3      1 2
       4 5 6  ->  4 5 6  ->  4 5 6  ->  4 . 6  ->  4   6
      7 8 9      7 . 9 8    7   . 8    7 5   8    7 5 3 8

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Puzzle Thoughts K Sengupta2023-07-13 23:39:12
re(2): 4, logically, no trial and errorAmber2005-06-14 03:32:34
re: 4, logically, no trial and errorMcWorter2005-06-10 16:43:38
4, logically, no trial and errorAmber2005-06-10 05:55:04
re: 3 movesCharlie2005-06-09 14:14:44
3 movesCaprice2005-06-08 14:47:31
re(2): Nope, 3's impossible.Amber2005-06-08 03:32:55
re: Nope, 3's impossible.McWorter2005-06-07 05:02:07
3 movesJennifer2005-06-07 05:00:33
Nope, 3's impossible.Amber2005-06-07 04:02:09
Hints/Tips3Amber2005-06-07 03:58:10
Solution...Cougar Draven2005-06-07 00:25:00
I think 4 is the answerSing4TheDay2005-06-06 18:34:13
Sorry, 3 is not possible!mattyturbo2005-06-06 14:11:44
I can do it in 3!mattyturbo2005-06-06 14:02:40
5? and spoilerFletch2005-06-06 11:30:32
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