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Telephone thing (Posted on 2005-07-06) Difficulty: 3 of 5
The numeric keyboards of a telephone (left) and a pocket calculator (right) differ in the arrangement of the keys.

123   789
456   456
789   123
  0      0

What is the least number of moves necessary to transfer the keys of the first arrangement into the other arrangement?
One move consists of switching the position of two neighbouring keys (Horizontal, vertical or diagonal) of which the sum is 9, 10 or 11.
Example: In the starting position you can switch 6 and 3, 5 and 6, 4 and 5, 7 and 4, 0 and 9

See The Solution Submitted by Hugo    
Rating: 4.1429 (7 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
The credit is to Leming...pcbouhid2005-07-26 15:10:07
re: solutionpcbouhid2005-07-25 22:12:47
solutionPaul2005-07-25 21:51:08
Solution29 switches!! (to be beatten!)pcbouhid2005-07-25 17:10:51
Please, wait...pcbouhid2005-07-14 16:50:06
re: Confusingbrianjn2005-07-12 05:24:52
keep walking, Hugo.pcbouhid2005-07-07 23:02:57
re(2): uninter(r)estingLeming2005-07-07 17:08:19
re: uninter(r)estingjohn2005-07-07 16:08:03
Confusingjohn2005-07-07 16:00:42
uninterrestingtraian2005-07-07 14:33:18
Solution31 moves . . . not so elegantLeming2005-07-06 19:07:24
How to play - my way, at least.brianjn2005-07-06 11:20:25
And More Than 9brianjn2005-07-06 07:02:26
One Move!brianjn2005-07-06 03:43:22
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