The New Sudoku Players' Forum

by **wapati** » Sat Dec 09, 2006 6:56 am

Swordfish, and lots more :!:

( I like swordfish!! )

Code: Select all: 6 8 . | . . . | . 3 . 3 . 2 | . 7 . | . . 6 . 9 5 | . . 3 | 8 . . --------------------- . . . | . 9 . | 5 . . . 7 . | 2 3 5 | . 9 . . . 6 | . 4 . | . . . --------------------- . . 8 | 9 . . | 3 6 . 5 . . | . 8 . | 4 . 9 . 6 . | . . . | . 8 1

by **wapati** » Mon Dec 11, 2006 12:29 am

A few patterns, many times.

Code: Select all: . . . | 4 . . | . . 1 . . 7 | . 5 . | 9 . . . 4 . | . . 7 | . 3 . --------------------- 2 . . | . 4 3 | 5 . . . 1 . | 2 . 5 | . 9 . . . 5 | 1 9 . | . . 2 --------------------- . 9 . | 7 . . | . 4 . . . 2 | . 1 . | 3 . . 8 . . | . . 9 | . . .

by **wapati** » Mon Dec 11, 2006 12:37 am

Not too tricky, several paths. 5 Turbots is one.

Code: Select all: 7 8 . | . 9 . | 6 . . 4 . . | 3 6 . | . . . . . 6 | . . 8 | . . 1 --------------------- . 4 . | . . . | 7 . . 1 5 . | . . . | . 2 3 . . 2 | . . . | . 1 . --------------------- 8 . . | 9 . . | 1 . . . . . | . 3 1 | . . 7 . . 7 | . 8 . | . 4 9

by **wapati** » Mon Dec 11, 2006 12:46 am

<Chuckle>

This is annoying for my pattern solving. Hard :!:

Code: Select all: 7 . 9 | . . 3 | . 6 . . 3 . | 9 . . | 1 . 7 1 . . | . . . | 3 5 . --------------------- . 5 . | . 9 . | . . 8 . . . | 3 . 2 | . . . 9 . . | . 8 . | . 7 . --------------------- . 9 5 | . . . | . . 2 3 . 2 | . . 8 | . 9 . . 8 . | 2 . . | 5 . 3

by **wapati** » Mon Dec 11, 2006 1:15 am

This one is, well ...

Swordfish ( I like them) and tons more. UR expected.

Code: Select all: . . . | . 7 . | . . . . 3 . | 5 . 9 | . 2 . 7 . 5 | . . . | 4 . 1 --------------------- . 1 . | 8 . 6 | . 9 . . . 9 | . . . | 3 . . . 6 . | 3 . 5 | . 4 . --------------------- 6 . 8 | . . . | 9 . 5 . 5 . | 9 . 2 | . 7 . . . . | . 5 . | . . .

by **Carcul** » Wed Dec 13, 2006 11:02 am

Wapati wrote:Swordfish, and lots more ( I like swordfish!! )

Code: Select all: *------------------------------------------------------* | 6 8 147 | 5 12 129 | 179 3 47 | | 3 14 2 | 148 7 189 | 19 5 6 | | 147 9 5 | 14 6 3 | 8 147 2 | |-----------------+------------------+-----------------| | 248 234 34 | 167 9 167 | 5 147 478 | | 148 7 14 | 2 3 5 | 6 9 48 | | 9 5 6 | 178 4 178 | 127 127 3 | |-----------------+------------------+-----------------| | 1247 124 8 | 9 12 1247 | 3 6 5 | | 5 123 137 | 167 8 1267 | 4 27 9 | | 247 6 9 | 3 5 247 | 27 8 1 | *------------------------------------------------------*

[r3c8]=7=[r3c1]-7-[r79c1]=7|1=[r7c12]-1-[r7c5]=1=[r1c5](-1-[r3c4]-
-4-[r3c8])=2=[r1c6]=9=[r1c7]-9-[r2c7]-1-[r3c8], => r3c8<>1,7 solving the puzzle.

Carcul

by **Carcul** » Wed Dec 13, 2006 11:59 am

Wapati wrote:A few patterns, many times.

Code: Select all: *-----------------------------------------------------------* | 9 23568 368 | 4 2368 268 | 2678 25678 1 | | 36 2368 7 | 368 5 1 | 9 268 4 | | 15 4 168 | 9 268 7 | 268 3 568 | |-------------------+-------------------+-------------------| | 2 678 9 | 68 4 3 | 5 1 678 | | 46 1 68 | 2 7 5 | 468 9 3 | | 3467 3678 5 | 1 9 68 | 4678 678 2 | |-------------------+-------------------+-------------------| | 15 9 136 | 7 2368 268 | 268 4 568 | | 67 567 2 | 568 1 4 | 3 5678 9 | | 8 3567 4 | 356 236 9 | 1 2567 67 | *-----------------------------------------------------------*

[r4c9]=8=[r2c8](-8-[r3c7])-8-[r8c8]=8=[r8c4](-8-[r7c56])-8-[r4c4]=8=
=[r6c6]-8-[r6c78]-{Nice Loop: [r5c7]-8-[r7c7]([r7c67]-2,6-[r7c5]-3-
-[r9c45]=3=[r9c2]-3-[r7c3]=3=[r1c3])=8=[r3c5]-8-[r3c3]=8=[r5c3]-8-
-[r5c7]}-8-[r5c7]=8=[r4c9], => r4c9=8 and the puzzle is solved.

Carcul

by **Carcul** » Wed Dec 13, 2006 3:08 pm

Wapati wrote:<Chuckle> This is annoying for my pattern solving. Hard

Code: Select all: *-----------------------------------------------------* | 7 2 9 | 15 15 3 | 8 6 4 | | 5 3 8 | 9 46 46 | 1 2 7 | | 1 46 46 | 8 2 7 | 3 5 9 | |------------------+-----------------+----------------| | 2 5 1467 | 1467 9 146 | 46 3 8 | | 8 1467 1467 | 3 1467 2 | 9 14 5 | | 9 146 3 | 146 8 5 | 2 7 16 | |------------------+-----------------+----------------| | 46 9 5 | 1467 3 146 | 467 8 2 | | 3 17 2 | 4567 4567 8 | 467 9 16 | | 46 8 17 | 2 467 9 | 5 14 3 | *-----------------------------------------------------*

-4-[r8c7]([r8c279]-6,7-[r8c4])=4|6=[r4c3](-6-[r4c7]=6=[r6c9]-6-[r6c4])=1=[X-Wing:r47c46]-1-[r16c4]-4,5-[r8c4], => r8c7=4 solving the puzzle.

Carcul

by **Carcul** » Wed Dec 13, 2006 5:45 pm

Wapati wrote:This one is, well ... Swordfish ( I like them) and tons more. UR expected.

Code: Select all: *-------------------------------------------------------* | 1248 48 1246 | 146 7 1348 | 568 3568 9 | | 148 3 146 | 5 1468 9 | 678 2 678 | | 7 9 5 | 26 2368 38 | 4 368 1 | |------------------+------------------+-----------------| | 2345 1 2347 | 8 24 6 | 57 9 27 | | 2458 48 9 | 1247 124 147 | 3 568 268 | | 28 6 27 | 3 9 5 | 1 4 278 | |------------------+------------------+-----------------| | 6 2 8 | 47 34 347 | 9 1 5 | | 134 5 134 | 9 68 2 | 68 7 34 | | 9 7 34 | 16 5 18 | 2 68 34 | *-------------------------------------------------------*

r5c5=2 or r1c6=1. But [r1c6]=3=[r1c8]=5=[r5c8](-5-[r5c1])=6=[r5c9]=
=8=[r6c9]-8-[r6c1]-2-[r15c1]=2|1=[r1c1]-1-[r1c6], => r1c6<>1 => r5c5=2 and the puzzle is solved.

For all those who like riddles, I will leave this solution for them: try to interpret the solution I posted. As usual, try to do that without the computer, and without additional peaces of paper. Just use the head.

Carcul

by **ArkieTech** » Thu Dec 14, 2006 4:15 am

Carcul said:

r5c5=2 or r1c6=1. But [r1c6]=3=[r1c8]=5=[r5c8](-5-[r5c1])=6=[r5c9]=
=8=[r6c9]-8-[r6c1]-2-[r15c1]=2|1=[r1c1]-1-[r1c6], => r1c6<>1 => r5c5=2 and the puzzle is solved.

For all those who like riddles, I will leave this solution for them: try to interpret the solution I posted. As usual, try to do that without the computer, and without additional peaces of paper. Just use the head.

I am just learning and am a great admirer. I am still working on understanding your solution but in working it out to complete the puzzle, I get to the following position:

Code: Select all: *-----------* |.8.|.7.|..9| |436|519|.2.| |795|2..|4.1| |---+---+---| |.1.|846|.9.| |.49|.2.|3.6| |.6.|395|14.| |---+---+---| |628|.3.|915| |.5.|9.2|.7.| |97.|.5.|2..| *-----------* *--------------------------------------------------* | 12 8 12 | 46 7 34 | 56 356 9 | | 4 3 6 | 5 1 9 | 78 2 78 | | 7 9 5 | 2 68 38 | 4 36 1 | |----------------+----------------+----------------| | 235 1 237 | 8 4 6 | 57 9 27 | | 58 4 9 | 17 2 17 | 3 58 6 | | 28 6 27 | 3 9 5 | 1 4 278 | |----------------+----------------+----------------| | 6 2 8 | 47 3 47 | 9 1 5 | | 13 5 134 | 9 68 2 | 68 7 34 | | 9 7 34 | 16 5 18 | 2 68 34 | *--------------------------------------------------*

I see the x-wing but even that leads to a brick wall for me.

Help!

dan

by **wapati** » Thu Dec 14, 2006 8:02 am

Toughie as a pattern. Quite hard.

URs, x, xy and finned x. (Yep, there are others, not required.)

Code: Select all: . 6 .|. 3 .|. . . 2 . .|. 5 1|. . . 9 . .|. . 8|7 . . -----+-----+----- . . .|. . .|4 7 . 8 . 6|. . .|. 5 9 4 5 .|. . .|. . . -----+-----+----- . 2 .|. 1 .|. . . . . 7|8 . .|. . 2 6 . .|4 7 .|9 1 .

by **wapati** » Thu Dec 14, 2006 8:17 am

This one is quite funny.

If you ask SE or Sudoku Cue this one is complicated.
It pretty much depends on the order that you look at
advanced techniques. Skyscraper, a Turbot form and
a Sashimi X. All the same method, odd names, and
the solvers treat them in different orders.

So, easy way or find the many methods that slowly work?

Code: Select all: 5 . 2 | . . . | 6 . . . . 1 | . 7 . | . 2 . . 8 . | 2 . 9 | . . . --------------------- 6 . . | 3 . . | 2 7 . . . . | 7 . 2 | . . . . 1 7 | . . 6 | . . 5 --------------------- . . . | 6 . 8 | . 9 . . 2 . | . 9 . | 5 . . . . 4 | . . . | 1 . 8

One skyscraper solves it.

by **Carcul** » Thu Dec 14, 2006 10:39 am

ArkieTech wrote:I see the x-wing but even that leads to a brick wall for me.

That is part of the riddle. However, I can say that there are two simple steps in front of your eyes which, in the right order, solve the puzzle. Study the puzzle carefully. Good luck.

Carcul

by **Carcul** » Thu Dec 14, 2006 10:54 am

Wapati wrote:Toughie as a pattern. Quite hard. URs, x, xy and finned x. (Yep, there are others, not required.)

Code: Select all: *------------------------------------------------------* | 7 6 148 | 29 3 49 | 5 28 148 | | 2 348 348 | 7 5 1 | 368 9 3468 | | 9 134 5 | 26 246 8 | 7 23 134 | |-----------------+-----------------+------------------| | 3 19 129 | 5 2689 69 | 4 7 68 | | 8 7 6 | 123 24 34 | 12 5 9 | | 4 5 29 | 1269 2689 7 | 12 368 368 | |-----------------+-----------------+------------------| | 5 2 49 | 369 1 369 | 68 468 7 | | 1 49 7 | 8 69 5 | 36 346 2 | | 6 38 38 | 4 7 2 | 9 1 5 | *------------------------------------------------------*

[r1c6]-4-[r5c6]-3-[r5c4]=3|6,9=[r4c6|r6c4]-9-[r46c5]=9=[r8c5]-9-[r8c2]
=9=[r4c2]-9-[r6c3]=9=[r6c4]-9-[r1c4]=9=[r1c6], => r1c6<>4 solving the puzzle.

Carcul

by **ravel** » Thu Dec 14, 2006 11:05 am

Carcul wrote:That is part of the riddle. However, I can say that there are two simple steps in front of your eyes which, in the right order, solve the puzzle.

Sorry Carcul, but ArkieTech wrote "I am just learning ", so we dont know, if he is familiar with unique rectangles and BUG (or whatever steps you mean).

The New Sudoku Players' Forum

CHAINS, not required. Good puzzles.