The New Sudoku Players' Forum

by **wapati** » Thu Apr 12, 2007 11:40 pm

There is a swordfish, or finned sworfish, involved in pattern solving this.

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

by **wapati** » Fri Apr 13, 2007 9:03 pm

This is pretty busy. Perhaps a finned sword, not sure if it is robust.

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

by **re'born** » Fri Apr 13, 2007 9:55 pm

wapati wrote:This is pretty busy. Perhaps a finned sword, not sure if it is robust.

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

Simple stuff takes us to:

Code: Select all: .---------------.---------------.---------------. | 5 348 1 | 468 9 38 | 7 46 2 | | 348 3489 6 | 48 7 2 | 5 1 39 | | 2 7 49 | 5 36 1 | 8 469 369 | :---------------+---------------+---------------: | 18 189 5 | 7 468 48 | 2 3 689 | | 6 489 489 | 3 2 5 | 1 89 7 | | 7 2 3 | 168 168 9 | 4 568 568 | :---------------+---------------+---------------: | 348 5 48 | 2 348 6 | 9 7 1 | | 148 6 27 | 9 148 478 | 3 258 58 | | 9 138 27 | 18 5 378 | 6 28 4 | '---------------'---------------'---------------'

Note the potential deadly pattern in r12c24[48]. So r1c2=3, r1c4=6, r2c2=3 or r2c2=9.

If r1c6=3, then r1c2<>3, r2c2<>3 (via r9c6 and r9c2). Also, r3c5=6 and so r1c4<>6. Moreover, we get r3c9=3 and so r2c9=9 implying r2c2<>9. This contradiction shows that r1c6<>3 which solves the puzzle.

Notation guru's, please help me with the notation for this :!:

My best guess is that it looks something like:

[r1c6](-3-[r1c2])(-3-[r9c6]=3=[r9c2]-3-[r2c2])-3-[r3c5]-6-[r1c4]=6|9=[r2c2]-9-[r2c9]-3-[r2c1]

and so r1c6<>3, solving the puzzle.

by **wapati** » Mon Apr 16, 2007 11:19 am

Several finned fish here.

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

by **wapati** » Mon Apr 16, 2007 11:22 am

This one has a lot of small patterns and a finned swordfish.

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

by **wapati** » Mon Apr 16, 2007 9:27 pm

3 swordfish. And stuff.

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

by **wapati** » Wed Apr 18, 2007 1:34 pm

A lot of different potential paths but no big fish that I saw.

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

by **wapati** » Fri Apr 20, 2007 6:42 pm

Fins, for sure. Finned sword, probably.

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

by **wapati** » Fri Apr 20, 2007 11:18 pm

Probably a swordfish. Certainly many smaller creatures.

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

by **wapati** » Tue Apr 24, 2007 3:49 pm

There is a swordfish here, and many other finned fish.

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

This puzzle has 5 too many clues but removing them leaves chains required, still, here it is minimal and diagonally symmetric:

8..7..96....3....7....6...8.2..37.....45.27...6..4..127...8....2..1.3....98.....1

Ughh, chains required.

by **wapati** » Wed Apr 25, 2007 6:35 am

I have some puzzles generated ahead, they take hours each.

Here are the last few, that is it for me in this thread.

....8.7.4.8...9.2...7...8.6....57.4.9..6.3..1.4.91....1.4...3...9.1...5.8.6.9....

2....15...5..4..2.7....63....24...5....692....9...36....83....7.2..8..3...32....4

9..4.3..8...869....6.....9..3.....5....3.2...8.1.5.4.3.1.....8...2.3.5....62817..

.........4.......3.15...62.3..5.2..9.2.....4..8..7..1..5..3..9.1..8.7..2..92.61..

1.......92.4...5.1.9.8.1.3.....5.....7.....4...64.27...4.....9..5.1.3.6.6..794..3

5.1.9...2..6..2...27.5.1.....57..23.6.......7.23..94.....2.6.71...9..3..9...5.6.4

52...1.6.8..42...1..........9..7...4.5.1.2.7.6...4..8..........9...37..5.7.5...43

87.42....9.4.37....1.......2....9.1.46...1.37.9.76...4.......7....81.3.9....74.25

by **ArkieTech** » Thu Apr 26, 2007 7:55 am

wapati,

Thank you for all the wonderful puzzles.

dan

by **ravel** » Thu Apr 26, 2007 7:03 pm

wapati wrote:Here are the last few, that is it for me in this thread.

Oh, thanks for your good work!
Still hope, that you will come back

by **wapati** » Fri Apr 27, 2007 5:02 am

ravel wrote:
wapati wrote:Here are the last few, that is it for me in this thread.
Oh, thanks for your good work!
Still hope, that you will come back

Thanks you two!

I may start a new thread, I still don't like chains.

I need a rest. :idea:

by **yzfwsf** » Tue May 05, 2020 12:26 pm

I didn't check the puzzles one by one, and I didn't rule out that there was a puzzle that needed a chain, but basically every puzzle didn't need a chain.

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The New Sudoku Players' Forum

CHAINS, not required. Good puzzles.

There comes a time.

Re: There comes a time.

Re: There comes a time.

Re: CHAINS, not required. Good puzzles.