Ruud wrote:you must be aware of the fact that Ron has a very small screen.
That's because I have very small eyes. Seriously, I use a 1024x768 pixel setting and "Medium" text size in MS Internet Explorer. Is that really considered "small?"?
Ruud wrote:you must be aware of the fact that Ron has a very small screen.
ronk wrote:Off-topicRuud wrote:you must be aware of the fact that Ron has a very small screen.
That's because I have very small eyes. Seriously, I use a 1024x768 pixel setting and "Medium" text size in MS Internet Explorer. Is that really considered "small?"?
ronk wrote:Ruud wrote:you must be aware that ronk has a very small screen.
I use 1024Ã—768 pixels and "Medium" text-size in MS Internet Explorer.
Is that really considered "small?"?
Ocean wrote:Was curious about the pencilmark grids (which techniques were applied for eliminations, when are the grids printed, etc), so I checked a few details. First: seems that you have a way of specifying "print the pm-grids before an x-wing is applied", or "every crucial step", or "every step", which is a nice option.
Ocean wrote:Second, for choice of elimination techniques, I checked especially #6: Here are six possible eliminations by naked pairs (@34), but these are not sufficient (and not necessary). The x-wing can be applied directly, the np-eleminations are not needed.
sudoku -qFNW -e G ocean-xwing.dat
sudoku -S -qFNW2 -e 'W>1' -f'puzzle %n xwings %(W)x' ocean-xwing.dat
output: puzzle 4 xwings 3
Thanks, but I haven't seen that nav bar for quite a while.Pat wrote:i suggest you try SuDoku.com/forums
( i.e. in a separate window rather than part of SuDoku.com
â€” saves you the wasted space at left for the navigation-bar )
Strange, as I would have thought the view had to be the same.fernat wrote:I am ditto [edit: using the same settings], mine did not wrap
gsf wrote:the selection can happen 2 ways (...)
Havard wrote:[#3:]
Here is my contribution to "interesting..."
... "Continuous" Almost Locked Sets XY
I have a hard time reading them even when lines don't wrap. (Twelve cells marked up with five letters a-b-c-d-e: difficult to see the logic even when told. Hopefully I learn it some day...) But for a solver program it's certainly an "interesting" test case. Maybe I should try to implement ALS... Anyway, thanks for pointing at the possibility, Havard.ronk wrote:... candidate grids are really hard to read when lines wrap.
Ocean wrote:Havard wrote:[#3:]
Here is my contribution to "interesting..."
... "Continuous" Almost Locked Sets XYI have a hard time reading them even when lines don't wrap. (Twelve cells marked up with five letters a-b-c-d-e: difficult to see the logic even when told. Hopefully I learn it some day...) But for a solver program it's certainly an "interesting" test case. Maybe I should try to implement ALS... Anyway, thanks for pointing at the possibility, Havard.ronk wrote:... candidate grids are really hard to read when lines wrap.
I would call the xy-chain pointed at by tso easier to spot:
2-[r1c4]-1-[r1c2]-9-[r9c2]-1-[r9c7]-8-[r7c9]-1-[r2c9]-2 =>r1c7<>2. Before and after it's singles only.
Havard wrote:Finally you will see that the last set connects back to the first one, and when this happens you can eliminate:
* all candidates that see ALL the "x" candidates in the sets
* all candidates that can see all occurences of ANY of the other candidates(not X's) in any set...
Hope that helped a bit!
5 19#c 169 | 12 8 7 | 126#a#e 4 3
123#c 7 13#c | 9 4 6 | 5 8 12#d
126#c 8 4 | 1235 125 123 | 7 9 126#d
---------------------+-------------------------+------------------------
369 2 3679 | 34568 5679 3489 | 468#a#e 1 689
8 4 1369 | 1236 1269 1239 | 26#a#e 7 5
169 5 1679 | 12468 12679 12489 | 2468#a#e 3 2689-2
---------------------+-------------------------+------------------------
7 3 2 | 1468 16 148 | 9 5 18
19 6 8 | 7 19 5 | 3 2 4
4 19#b 5 | 128-1 3 1289-1 | 18#b 6 7
"Continuous" Almost Locked Sets XY
Havard wrote:[...] Finally you will see that the last set connects back to the first one, and when this happens you can eliminate:
* all candidates that see ALL the "x" candidates in the sets
* all candidates that can see all occurences of ANY of the other candidates(not X's) in any set...
ronk wrote:Brief notation [...] Maybe something along the lines of ...
- a(1|246|8) - b(8|1|9) - c(9|123|6) - d(6|2|1) -
Then one can easily see the links between sets are digits 8, 9, 6, and 1 for set pairs a-b, b-c, c-d, and d-a, respectively.
And it's also easy to see, when the loop is continuous, that digits 246, 1, 123, and 2 are locked in sets a, b, c, and d, respectively. (Don't forget the exclusion r1c3<>1.)
ronk wrote:Maybe something along the lines of ...
- a(1|246|8) - b(8|1|9) - c(9|123|6) - d(6|2|1) -
Then one can easily see the links between sets are digits 8, 9, 6, and 1 for set pairs a-b, b-c, c-d, and d-a, respectively.
And it's also easy to see, when the loop is continuous, that digits 246, 1, 123, and 2 are locked in sets a, b, c, and d, respectively. (Don't forget the exclusion r1c3<>1.)
Almost Locked Sets XY rule:
9 135-1 7 | 6 18#a 358 | 2 38 4
45#h 8 34#f | 2 35#g 7 | 1 9 6
6 13#r 2 | 138-1 49#b 49 | 5 38 7
------------------+-------------------+------------------
14#i 7 89 | 358 6 348 | 39 25#k 12#j
25#o 25#p 34#e | 9 47#c 1 | 37#d 6 8
13#m 6 89 | 578 2 358 | 379 4 15#l
------------------+-------------------+------------------
78 4 5 | 178 89#a 29 | 6 12 3
23#n 9 1 | 4 35 6 | 8 7 25
78 23#q 6 | 1357 178 2358 | 4 125 9
ronk wrote:- a(1|246|8) - b(8|1|9) - c(9|123|6) - d(6|2|1) -
Then one can easily see the links between sets are digits 8, 9, 6, and 1 for set pairs a-b, b-c, c-d, and d-a, respectively.
And it's also easy to see, when the loop is continuous, that digits 246, 1, 123, and 2 are locked in sets a, b, c, and d, respectively.
Havard wrote:Also, what about:
a(246)-8-b(1)-9-c(123)-6-d(2)-1-a
Here you don't have to present the "x" twice ...
Havard wrote:... and that might be clearer once you remove the colors (the colors make it very very clear, but they are not always available) (...) Thoughts?
gsf (2007.Jan.17) wrote:
filtered ~2M generated symmetric puzzles from last March --
[ 28 clues ]
- Code: Select all
. 4 7 | 3 . . | 8 . .
. . . | . 1 . | . 5 .
. 1 3 | 2 . 8 | . . .
-------+-------+------
. . . | 1 . . | . . 5
. . 1 | 5 . 2 | 6 . .
7 . . | . . 3 | . . .
-------+-------+------
. . . | 4 . 5 | 1 6 .
. 9 . | . 6 . | . . .
. . 4 | . . 1 | 2 7 .
. 9 . | . . . | . 6 .
5 . . | . 2 . | . . 4
. . 1 | 7 . 4 | 9 . .
-------+-------+------
9 . . | . 5 . | . . 3
. 5 . | 4 . 2 | . 9 .
4 . . | . 1 . | . . 8
-------+-------+------
. . 6 | 2 . 5 | 3 . .
3 . . | . 9 . | . . 6
. 7 . | . . . | . 5 .