The New Sudoku Players' Forum

[tarek]

I haven't checked these manually. Electronically the x-wings are >=1 with a possible of 4=>maximum>=2.

Code: Select all

 . . . | 9 7 5 | . . . 
 . . 3 | . . . | 4 . . 
 . 8 . | . . . | . 5 . 
-------+-------+------
 2 . . | . 9 . | . . 6 
 1 . . | 4 . 6 | . . 8 
 9 . . | . 5 . | . . 7 
-------+-------+------
 . 1 . | . . . | . 3 . 
 . . 4 | . . . | 2 . . 
 . . . | 3 4 8 | . . . 

 . . . | 8 4 9 | . . . 
 . . 4 | . . . | 6 . . 
 . 9 . | . . . | . 2 . 
-------+-------+------
 1 . . | . 7 . | . . 5 
 9 . . | 6 . 2 | . . 3 
 7 . . | . 1 . | . . 8 
-------+-------+------
 . 2 . | . . . | . 9 . 
 . . 3 | . . . | 1 . . 
 . . . | 5 2 4 | . . . 

 . . . | 6 1 3 | . . . 
 . . 9 | . . . | 7 . . 
 . 3 . | . . . | . 2 . 
-------+-------+------
 3 . . | . 2 . | . . 9 
 2 . . | 9 . 6 | . . 5 
 7 . . | . 4 . | . . 8 
-------+-------+------
 . 2 . | . . . | . 6 . 
 . . 4 | . . . | 9 . . 
 . . . | 2 5 1 | . . . 

 . . . | 2 5 7 | . . . 
 . . 6 | . . . | 7 . . 
 . 5 . | . . . | . 3 . 
-------+-------+------
 4 . . | . 3 . | . . 9 
 7 . . | 9 . 5 | . . 2 
 8 . . | . 4 . | . . 1 
-------+-------+------
 . 8 . | . . . | . 4 . 
 . . 3 | . . . | 5 . . 
 . . . | 6 1 8 | . . .

000753000004000600080000070600090002400308001300010008050000080007000300000984000
000719000005000600040000070600020001500904008300080004030000040007000900000245000
000752000009000200030000060400030007600809004300060009020000090008000100000176000
000491000008000900010000050100030002500708006300050004020000080009000600000645000
000843000005000800090000070500020009200104007800050006070000020003000900000519000
000582000001000500040000030100070009700608003500010004030000070002000400000164000
000127000004000800070000030500030009800205001600070004090000020003000400000843000
000879000006000800050000010100050007700603002200090006010000060003000400000324000
000279000003000200060000040400010007700302005500060003040000030008000900000853000
000197000005000100060000080800060009900501003300040005080000050002000700000235000
000397000004000700050000080900020003100806002800010005080000050006000900000471000
000564000009000100020000080900030006100807003800010002080000050007000200000925000
000639000005000600040000010300080001100905002200060007060000020008000400000256000
000583000008000500070000090300020004100406002900010007090000080006000400000871000
000728000002000300040000050500040008600203005700050004050000020006000800000197000
000486000002000100050000080900030006600701002800050007090000020001000600000815000
000543000006000200080000010100080004700602009900030006010000060007000500000791000
000823000002000900040000030500040006300209004700080003060000020009000400000174000
000219000002000800010000060600030005800501002400070003090000010008000500000348000
000791000009000400020000050400070008900805007100060003030000080006000700000918000
000874000001000200070000040800040001300507009200010003030000070005000800000632000

tarek

[gsf]

using gsf's software,
i need to combine 2 separate tests --

• -qNFW2-G ==> valid
• -qNFBHT-G ==> invalid

Code: Select all

-qNFW2-G -Q!NFBHT-G

-Q alllows a ( ! && || ) logical constraint expression that must also be true
so !NFBHT-G means does not solve with NFBHT-G

[Pat]

With what you mentioned somewhere else Pat regarding Red Herrings.....

As x-wings are usually used after subset search has been exhausted (or even up to hidden triples).... this provides so many red herrings

I am thinking of something similar but with Swordfish

thanks, tarek !!

• A Pure Swordfish Collection
• A Pure Jellyfish Collection
  
  
  [off-topic:]
  plenty of red herrings -- at all levels -- in Eioru's Topic on "Best Sample of Puzzles from 1.0 to Infinite Rating of SE"
  ( assuming you accept the ratings of Nicolas Juillerat [ Sudoku Explainer ] )

[Pat]

late X-wing

last year, i happened to solve an X-wing puzzle which got pretty far before needing the X-wing -- just "singles" got me to 58, then the X-wing was needed and all the rest was "singles" -- i noticed it because 58 seemed quite high.

shortly thereafter, when someone requested an explanation of X-wing, i found it useful to post this example -- with so many cells known, the X-wing should be obvious. ( the example was well received, and tarek even re-posted it. )


well, looking at the recent contributions in the present Topic, i see that 58 is no longer a record ( if ever it was ) !!

42 [ 24 clues ]

...719.....5...6...4.....7.6...2...15..9.4..83...8...4.3.....4...7...9.....245...

reaches 61 with "singles" --

Code: Select all

 . 6 3 | 7 1 9 | 4 . 5
 7 . 5 | 4 3 . | 6 . 9
 9 4 . | . 5 . | . 7 3
-------+-------+------
 6 8 4 | 5 2 3 | 7 9 1
 5 . . | 9 7 4 | 3 6 8
 3 7 9 | . 8 . | 2 5 4
-------+-------+------
 . 3 . | . 9 7 | 5 4 6
 4 5 7 | 3 6 . | 9 . 2
 . 9 6 | 2 4 5 | . 3 7



-- then the X-wing is needed and all the rest is "singles".

i.e. an even-more-obvious X-wing example.

[daj95376]

Testing the waters.

Code: Select all

..7.5.24...8..1....16...97...5......69..1....3...42.5...29.....85.....12......... # 1227


Code: Select all

....586...45..6..9......35.398....4.4.2...5.8.7....963.53......9..4..23...483.... # 2187
.23.6197....79..239..2.36.....3...6.....4.....3...2.....46.8..237..24....8213.49. # 2184
...5.8...65.2..3......39.543..96..8..7.1.3.6..6..85..319.85......8..2.16...3.1... # 2174
..1.....954.1...23....4.....3.6..9.57...5...26.5..9.1.....6....27...4.364.....5.. # 1207
.4.9..1.35.7.1..2.8....24.....6.....4...5...6.....1.....41....2.5..3.6.46.2..8.1. # 1207
.......8378...31.....8.94..3.7.1..4..2.....3..6..3.5.1..89.7.....93...5717....... # 1200
...6....5..8..56.4..534.1.22.6.3.5.............3.5.2.18.2.137..5.14..8..3....2... # 1192
3..5.8..6.......3882..3.1..1....9.4..6..5..1..8.1....3..4.1..9575.......6..4.5..1 # 1192
37.1...5.81..3..9..29..7.31...3......9..1..8......8...93.6..17..5..2..68.6...3.42 # 1191
1..2.7.........8.7..2..9.1...8..45.32.49.31.89.57..2...9.1..7..5.1.........8.2..1 # 1188
..7...1.....27436.6..1...7..2.4......1458672......2.1..4...1..7.51327.....3...2.. # 1185
.....57...93682.1..2..3.9.....85.2..9.......8..8.19.....2.9..5..8.56712...71..... # 1185
....8.....2..9418...75.64.3...6......7641923......7...4.53.86...6894..7.....6.... # 1180
5.3.6...2.2.4....17..1325.....2.4..9....8....4..3.1.....8613..72....7.3.3...2.8.4 # 1180
..268...44..5..9.6.6...98..18......2.7..6..8.6......91..61...4.8.1..7..99...261.. # 1179
.47.8.....6.2.3..73...49....9.8..7..7..314..9..3..7.6....93...62..4.8.3.....7.42. # 1179
.27..5.......7....1...38.722.17.9.8...6.5.2...4.1.23.961.59...3....2.......3..19. # 1176
32.5.6.7...9...26...627...9...9.2....3..6..4....7.4...4...137...72...6...1.6.7.54 # 1174
......8......7816...49...757513.9..8.6..1..5.4..6.791368...57...4978......7...... # 1165
.9.1...7242..95..3.........8.967132.1...2...8.423897.1.........2..96..1796...8.3. # 1162
3.64..9.8...9...4..9..861.3561.9.2.............9.2.6311.564..9..4...9...9.8..13.4 # 1157


[Pat]

62,..7.5.24...8..1....16...97...5......69..1....3...42.5...29.....85.....12.........,24
63,....586...45..6..9......35.398....4.4.2...5.8.7....963.53......9..4..23...483....,30
64,.23.6197....79..239..2.36.....3...6.....4.....3...2.....46.8..237..24....8213.49.,33
65,...5.8...65.2..3......39.543..96..8..7.1.3.6..6..85..319.85......8..2.16...3.1...,32
66,..1.....954.1...23....4.....3.6..9.57...5...26.5..9.1.....6....27...4.364.....5..,27
67,.4.9..1.35.7.1..2.8....24.....6.....4...5...6.....1.....41....2.5..3.6.46.2..8.1.,27
68,.......8378...31.....8.94..3.7.1..4..2.....3..6..3.5.1..89.7.....93...5717.......,28
69,...6....5..8..56.4..534.1.22.6.3.5.............3.5.2.18.2.137..5.14..8..3....2...,30
70,3..5.8..6.......3882..3.1..1....9.4..6..5..1..8.1....3..4.1..9575.......6..4.5..1,29
71,37.1...5.81..3..9..29..7.31...3......9..1..8......8...93.6..17..5..2..68.6...3.42,31
72,1..2.7.........8.7..2..9.1...8..45.32.49.31.89.57..2...9.1..7..5.1.........8.2..1,30
73,..7...1.....27436.6..1...7..2.4......1458672......2.1..4...1..7.51327.....3...2..,31
74,.....57...93682.1..2..3.9.....85.2..9.......8..8.19.....2.9..5..8.56712...71.....,30
75,....8.....2..9418...75.64.3...6......7641923......7...4.53.86...6894..7.....6....,31
76,5.3.6...2.2.4....17..1325.....2.4..9....8....4..3.1.....8613..72....7.3.3...2.8.4,31
77,..268...44..5..9.6.6...98..18......2.7..6..8.6......91..61...4.8.1..7..99...261..,31
78,.47.8.....6.2.3..73...49....9.8..7..7..314..9..3..7.6....93...62..4.8.3.....7.42.,31
79,.27..5.......7....1...38.722.17.9.8...6.5.2...4.1.23.961.59...3....2.......3..19.,31
80,32.5.6.7...9...26...627...9...9.2....3..6..4....7.4...4...137...72...6...1.6.7.54,31
81,......8......7816...49...757513.9..8.6..1..5.4..6.791368...57...4978......7......,33
82,.9.1...7242..95..3.........8.967132.1...2...8.423897.1.........2..96..1796...8.3.,35
83,3.64..9.8...9...4..9..861.3561.9.2.............9.2.6311.564..9..4...9...9.8..13.4,34

thanks, daj95376 -- now i'll have to start testing these too to determine how many X-wings they need---



meanwhile, you've made a nice improvement on late X-wing --

72 [ 30 clues ] -- after "singles" we need an X-wing at 63 !

Code: Select all

 1 8 . | 2 . 7 | 9 . 5
 . 5 9 | . . 1 | 8 2 7
 . 7 2 | 5 8 9 | . 1 .
-------+-------+------
 7 1 8 | 6 2 4 | 5 9 3
 2 6 4 | 9 5 3 | 1 7 8
 9 3 5 | 7 1 8 | 2 . .
-------+-------+------
 8 9 . | 1 . 5 | 7 . 2
 5 2 1 | . 7 6 | . 8 9
 . 4 7 | 8 9 2 | . 5 1



[solgor100]

I have just become a member of this forum and need some help. I would like to download the puzzles in this post but I cannot figure out how to do it. Your help would be appreciated

[Cec]

Hi solgor100 and welcome to the forum.

Firstly, because your request is unrelated to the thread you posted to it should be posted as a new topic by selecting the "new topic" button at the top-left corner of the forum page.

When mentioning "downloading" puzzles, if you are asking how to post puzzles, then you can read up on the procedures, including basic sudoku terminology, etc. by clicking on here

In case I've "gone off the rails" in replying to this request other members are more than welcome to steer solgor100 in the right direction

Cec

[solgor100]

I have just become a member of this forum and need some help. I would like to download the puzzles in this post but I cannot figure out how to do it. Your help would be appreciated

Sorry, as I said I am brand new here and did not know the procedures. I will now post this message as a new topic. Thanks.

[Cec]

"Sorry, as I said I am brand new here and did not know the procedures. I will now post this message as a new topic..."

My apologies solgor100 for my poorly worded response to your request. I'll blame the unprecedent hot spell of weather we're having over here which has made me more grumpy than normal . I've sent a PM to you which I hope makes things clearer.

I note you have re-posted your query to the "General Puzzle" Forum under the new topic Downloading

Cec

[Pat]

I would like to download the puzzles in this post

hi solgor100

the puzzles are posted above as CSV ( comma-separated values )

you can paste the text into a file named "puzzles.CSV"
-- it can then open in Microsoft Excel

[daj95376]

meanwhile, you've made a nice improvement on late X-wing

Belated thanks! Also, maybe that should be X-Wings -- take your pick!

Code: Select all

 +-----------------------+
 | 1 8 . | 2 . 7 | 9 . 5 |
 | . 5 9 | . . 1 | 8 2 7 |
 | . 7 2 | 5 8 9 | . 1 . |
 |-------+-------+-------|
 | 7 1 8 | 6 2 4 | 5 9 3 |
 | 2 6 4 | 9 5 3 | 1 7 8 |
 | 9 3 5 | 7 1 8 | 2 . . |
 |-------+-------+-------|
 | 8 9 . | 1 . 5 | 7 . 2 |
 | 5 2 1 | . 7 6 | . 8 9 |
 | . 4 7 | 8 9 2 | . 5 1 |
 +-----------------------+

   c38   X-Wing                          <> 3    [r1c5],[r7c5]
 r39     X-Wing                          <> 3    [r2c1],[r8c7]
 r17     X-Wing                          <> 4    [r2c5],[r6c8]


Too bad I don't get credit for late abnormal Swordfish -- take your pick!

Code: Select all

3-Fish c358\r127                   030\300  <> 3  [r2c14]
3-Fish r389\c147                   300\030  <> 3  [r2c14]
3-Fish c147\r238                   030\300  <> 4  [r2c5],[r3c9]
3-Fish r167\c589                   300\030  <> 4  [r2c5],[r3c9]


[Mike Barker]

A suggestion - why not put the puzzle first and then the ordinals, etc. Many solvers can read this format without having to go through all the extra steps. For example:

Code: Select all

..7.5.24...8..1....16...97...5......69..1....3...42.5...29.....85.....12......... #62,24
....586...45..6..9......35.398....4.4.2...5.8.7....963.53......9..4..23...483.... #63,30
.23.6197....79..239..2.36.....3...6.....4.....3...2.....46.8..237..24....8213.49. #64,33
...5.8...65.2..3......39.543..96..8..7.1.3.6..6..85..319.85......8..2.16...3.1... #65,32

[Pat]

meanwhile, you've made a nice improvement on late X-wing

maybe that should be X-Wings -- take your pick!

• 3 c38\r17 ==> r1c5,r7c5 <> 3
• 3 r39\c17 ==> r2c1,r8c7 <> 3
• 4 r17\c58 ==> r2c5,r6c8 <> 4

yes! all 3 X-wings are available at this point ( 63 cells known )
-- and any one of them is sufficient

you may want to post this in the other Topic

[tarek]

These have been posted on the Patterns Games 14-51 (1st 2 have full symmetry):

6...7...3.4.....8....9.1.....6...7..5...3...6..4...2.....4.3....8.....1.1...6...5 Patterns_Game_0019_050-m_b_metcalf 3.2/1.2/1.2
...........87.62...798.241..32...75.....2.....94...62..256.719...71.95........... Patterns_Game_0021_009-m_b_metcalf 3.2/1.2/1.2
1....23454...1....6..7.....3..8.69...6.....8...82.7..3.....5..1....2...98159....6 Patterns_Game_0033_076-gsf 3.2/1.7/1.7
.9.5...7.2...4...9.....9...7...5.6...5.6.3.8...8.2...1...7.....4...3...6.2...1.9. Patterns_Game_0039_025-gsf 3.2/3.2/3.2
..57......8...92..3......1.6..3...7...........4...8..5.2......4..71...3......38.. Patterns_Game_0045_043-gsf 3.2/1.2/1.2
.....12...3..4..5.2.67..4..5.....1...6.....2...8.....9..1..78.6.4..8..3...79..... Patterns_Game_0048_056-JPF 3.2/2.3/2.3

tarek