| Thurs 28 Dec (Thursday, 28th December 2006) |
PuzzleLover
Kwon-Tom Obsessive
Puzzles: 1033
Best Total: 38m 17s | Posted - 2006.12.28 05:14:31
I got this far with patterns. Finishing from here was basically trial and error. Am I missing some patterns or easy lookaheads? Thanks.
|
Gadget1903
Kwon-Tom Addict
Puzzles: 325
Best Total: 23m 39s | Posted - 2006.12.28 05:40:31
You can get a little further realizing that a line above the 1 at r2c9 creates a quick inner loop.
After that I guessed the rest. |
m2e
Kwon-Tom Obsessive
Puzzles: 607
Best Total: 16m 43s | Posted - 2006.12.28 06:55:00
Muck around with the 1 @ r4c6. That one should carry you to the end of the puzzle i think. |
Filthy
Kwon-Tom Obsessive
Puzzles: 1376
Best Total: 17m 21s | Posted - 2006.12.28 07:37:53
You're missing this common pattern:
becomes
|
m2e
Kwon-Tom Obsessive
Puzzles: 607
Best Total: 16m 43s | Posted - 2006.12.28 07:52:20
I always forget that one  |
procrastinator
Kwon-Tom Obsessive
Puzzles: 1083
Best Total: 12m 56s | Posted - 2006.12.28 09:26:09
There's simple counting to be done down the bottom, which also gives you another line on the 2 just above. |
foilman
Kwon-Tom Admin
Puzzles: 3615
Best Total: 24m 6s | Posted - 2006.12.28 10:22:08
Quote: Originally Posted by procrastinator There's simple counting to be done down the bottom, which also gives you another line on the 2 just above. |
|
PuzzleLover
Kwon-Tom Obsessive
Puzzles: 1033
Best Total: 38m 17s | Posted - 2006.12.29 04:06:30
I forgot that upper right pattern, thanks.
Quote: Originally Posted by foilman Quote: Originally Posted by procrastinator There's simple counting to be done down the bottom, which also gives you another line on the 2 just above. |
Yes, I saw that too - the 4th row from the bottom has just one unknown, and 3 lines, so you know the remaining one must be a line too (to keep the number of lines even). |
I'm not finding any cut sets or region entries/exits where I can visualize a count on the top. |
procrastinator
Kwon-Tom Obsessive
Puzzles: 1083
Best Total: 12m 56s | Posted - 2006.12.29 04:50:42
Quote: Originally Posted by puzzlelover
I'm not sure which 2 procrastinator is referring to,
|
The counting argument gives you a line on a 1, there's a 2-with-an-x just above it, and now one of the three possible pairs of lines doesn't work.
Quote: Originally Posted by puzzlelover
When you're counting, do you tend to look for regions, cut sets, or both?
|
If I'm understanding you correctly, then any region has a cutset isolating it from the rest of the graph (The set of (potential) edges which join a point in the region to a point outside). If the region you choose is something like "the bottom four rows", then your cutset will be a single row of vertical edges. Those are the easiest cutsets to count, but some regions don't have a neat cutset like that. So I first detect the (near)-isolated region, then look for the easiest cutset to count. If there is a single row of edges then that will be easiest so I look for a cutset of that ilk first. |
PuzzleLover
Kwon-Tom Obsessive
Puzzles: 1033
Best Total: 38m 17s | Posted - 2006.12.29 05:06:47
Quote: Originally Posted by procrastinator Quote: Originally Posted by puzzlelover
I'm not sure which 2 procrastinator is referring to,
|
The counting argument gives you a line on a 1, there's a 2-with-an-x just above it, and now one of the three possible pairs of lines doesn't work. |
|
Jankonyex
Kwon-Tom Obsessive
Puzzles: 5680
Best Total: 9m 35s | Posted - 2006.12.29 08:18:17
I remember... I made this then finished the puzzle.
Last edited by Jankonyex - 2006.12.29 08:20:11 |
PuzzleLover
Kwon-Tom Obsessive
Puzzles: 1033
Best Total: 38m 17s | Posted - 2006.12.30 06:15:27
Quote: Originally Posted by jankonyex I remember... I made this then finished the puzzle. |
|
