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"No Three in a Line (9x9)" by Dave

added 06 Dec 2013 01:32
Solved2/2
Cooked0/2
Difficulty6.00
Style9.50
Rigidity5.00
Shortest Solution
NameSpeedrun
Length385 moves
Bymark
On07 Dec 2013 12:02

Comments (turn spoilers off)
18773 No Three in a Line (9x9) Dave (2400) Sat 07 Dec 2013 22:49  
  Moved to graveyard:
Oh dear, that was silly. Fix coming... Mark, you can ctrl-0 to get speedrun back :)
 
18771 No Three in a Line (9x9) mark (2878) Sat 07 Dec 2013 12:02 SPOILER
  Added speedrun: 385 moves (old: 456).
 
18767 No Three in a Line (9x9) Dave (2400) Fri 06 Dec 2013 23:37 SPOILER
  Hi N7.

I found the easist and most compact way to implement this would be to use transponders as the pieces. It's rather hard to explain it in a few sentences though. The problem is: the underlying puzzle, although mathematically interesting, is way to easy to make a decent Escape level. So I ditched the idea completely and set about making it work with balls. This way it would not be too hard but make a really interesting speedrun challenge. Although the final parity checking mechanism is really simple, it did take me a while to come up with it.

Does this answer your question?
 
18765 No Three in a Line (9x9) N7DOT (2227) Fri 06 Dec 2013 20:25  
  Oops, forgot a question I had: Is there a good reason why spheres were used instead of steel?
 
18764 No Three in a Line (9x9) N7DOT (2227) Fri 06 Dec 2013 20:19  
  You beat me to it! I had been planning an implementation of No Three in a Row, but that didn't get much work on it.
 
18763 No Three in a Line (9x9) Jim (2369) Fri 06 Dec 2013 19:58 SPOILER
  Added speedrun: 456 moves (old: 478).
 
18762 No Three in a Line (9x9) mark (2878) Fri 06 Dec 2013 12:42 SPOILER
  Added speedrun: 478 moves (old: 578).
Nice puzzles Dave.This one justed clicked on the first thing i did.
N queens (9x9)took me over an hour.
 
18761 No Three in a Line (9x9) Dave (2400) Fri 06 Dec 2013 03:06  
  The rules: Every sphere must be in the 9x9 field, no more than two in any row or column. Simple as that.
 
18760 No Three in a Line (9x9) Dave (2400) Fri 06 Dec 2013 01:32  
  'No Three in a Line (9x9)' uploaded by Dave:
9x9 part 3.