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#743, September 15 - September 21:
The Weekly Extreme Str8ts Puzzle

by Andrew Stuart
WARNING: This is the Weekly 'Extreme' Str8ts.
Only attempt this puzzle if you have time and patience.
Using the solver will not help you. (much).
Archive
Since there has been interesting strategy discussion on these puzzles and by popular request, I have opened an archive on the last thirty weeks. The discussion section is open for continued posting.
Share and Enjoy
Puzzles 1 to 250 are available as Puzzle Packs, just $5.49.

Discussion...
Posts you have NOT read are in normal colors, older ones are in grey.
Please email me if you experience problems or bugs. Cheers, Andrew Stuart


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No full solutions please!

by: hp

 15-Sep-2024, 10:09
for me not that easy
after CE, xwing 2 and Setti 8,4 solved 11 cells, no progress
hints ?
 

by: Klaus

 15-Sep-2024, 10:41
 Hi hp,

i would say very, very careful elimination in column 1, amongst others with consequences in row 5, and then all kind of Settis, 8, 4, 3, 5, 6.
 

by: hp

 15-Sep-2024, 11:36
Hi Klaus, nice to hear from you.
I had in col 1: 289, 29, 3, 289, 46, 7, 56 and 45
I think you meant Row E: i had 46, 5, 9, 46, 7,1,8, 23,23
hint?
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by: BP

 15-Sep-2024, 06:01
Hi all!

You've probably read last week's sad news that after providing us for several years with phantastic puzzles kst has retired from this forum.

However there is a little silver lining: kst planned ahead and left a goodbye present of 11 further sets of puzzles, which he gave me to upload over the coming weeks. The first set is posted below.

I don't know what will happen after that. It would be great if some known or yet unknown puzzle creator will step into kst's shoes. Until then: Enjoy kst's last sets!
 

by: Klaus

 15-Sep-2024, 06:44
 
thinking a bit about what these Str8ts-variants would mean for my solver, i realized that i dont even properly know the definitions of these.

B-Puzzles means you have this additional 9 boxes like in Sudoku, right? but what do black cells mean for this boxes? i have no idea, can anybody tell me?
 

by: BP

 15-Sep-2024, 07:17
 Hi Klaus! This is the defintion I give in my B-Str8ts-tutorial:

To B-Str8ts puzzles the same rules apply as to normal Str8ts puzzles plus one additional rule:
The 9x9-grid of cells is divided into nine 3x3-subgrids, called boxes. For each of these boxes the following condition is set: Each digit from 1 … 9 may appear at most once in the box.
Thus a B-Str8ts puzzle can be viewed as a Str8ts puzzle with additional Sudoku rules.
Note that the digits within a box need not form a straight, i.e. they need not be consecutive.
 

by: Martinus

 15-Sep-2024, 09:28
 I had not yet read the bad news from last week.
Thank you so much, kst, for your puzzles. You created work that gave joy to many people.
 

by: Klaus

 15-Sep-2024, 09:54

Thanks BP for helping me out.

i have to say i'm a bit astonished. the unique beauty of Str8ts comes from black cells generating compartments and these being straight, no?

and its given for rows, columns, diagonals, but not for boxes!? odd...
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by: kst puzzle posted by BP

 15-Sep-2024, 05:59

 

by: Martinus

 15-Sep-2024, 07:10
 Not hard, but fun. CE in boxes and settis. Thanks!
 

by: BP

 15-Sep-2024, 07:48
 Very enjoyable mix of CE and B Settis. Many thanks, kst, for the extra fun!
 

by: optimator

 15-Sep-2024, 07:49
 more joy! I needed a quick HC on D12 to start. Thanks kst & BP!
 

by: Hel

 15-Sep-2024, 08:55
 Like Martinus and BP. Thanks both kst & BP!
 

by: Loser

 15-Sep-2024, 10:49
THX BP for the kst-set
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by: kst puzzle posted by BP

 15-Sep-2024, 05:59
 

by: Martinus

 15-Sep-2024, 09:23
 Not hard, but needs some careful looks, especially b settis. Thanks, kst and BP.
 

by: optimator

 15-Sep-2024, 12:01
like Martinus
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by: kst puzzle posted by BP

 15-Sep-2024, 05:58
 

by: Martinus

 15-Sep-2024, 09:50
 Doable with some x SI, settis and one triple wing. Thanks, kst!
 

by: Cosmanita

15-Sep-2024, 12:14
Really nice one. First it looks as too less numbers. But as Martinus said, a SI (or long interaction) in diagonals and column 2 helps. Later on a 3-er wing on 7.
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by: kst puzzle posted by BP

 15-Sep-2024, 05:57
 

by: Nessi

 15-Sep-2024, 08:00
 Dear BP, thank you so much for posting the puzzles of kst. 11 more weeks with additional fantastic puzzles.
 

by: BP

 15-Sep-2024, 08:12
 Dear Nessi, thank you, but I think thanks should be directed at kst, because creating puzzles is much harder than posting them (which kst made extra easy for me) :-)
 

by: E.H.

 15-Sep-2024, 10:59
Very nice puzzle, solved with CE, SI and a short chain. Many thanks to kst for the wonderful weekends.
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by: BMi

 15-Sep-2024, 05:29
Column B is really nice.
After that, one of the options in JK4 leads straight to a solution. I didn't check the other till a contradiction
 

by: BMi

 15-Sep-2024, 05:32
I meant HJ4 :-)
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  • 30-40 mins maybe? Doable if I can concentrate. Today I could ;-)
    - Marc
  • i understood bennys hint wrong. i think my english is to bad. so benny must be right, sorry
    - dersoloist
  • 1 hidden triple, the rest is just settis and x-wings
    - kris
  • Thanks for that puzzle :))
    - Marit
  • 20min with the hints
    - Martin
  • 39' - was stuck pretty early, a chain lead to a contradiction which helped
    - COM
  • 35' with Korbinians hint. Have a lovely Sunday and thanks
    - Emma
  • 19' - Settis and concentration :-)
    - LK
  • Benny_42 is right: If HJ2 is high then A12, B12 and D12 must all three be low, which is impossible. So HJ2 must be low.
    - JustTesting
  • 50 distracting minutes, thank you Andrew :) Also big thank you to kst for always having provided the x and b and xb and extra str8ts
    - Silke
  • below 15 min
    - Loser
  • Hammer! Eines der schönsten seit langer Zeit, Geduld lohnt sich
    - Cle
  • 25' logic, settis, wings- very interesting
    - optimator
  • 2 hrs with CE, SI and X-wings. Very funny.
    - E.H.
  • 17'. Nice Sunday morning entertainment.
    - MartinL
  • Korbinians hint is too strong: then the solver can do it alone (=no CE, no xwing,no setti etc).
    - climber
  • 67‘ uff. But doable without chains, just setti, x-wing, setti, x-wing and a lot of thinking
    - TheUffOne
  • 11 min
    - Nessi
  • 60min, with hint from Korbinian. Bennys hint is completly wrong
    - dersoloist
  • 19' with BMI's hint,
    - Richard
  • 41' WC
    - Hel
  • 20 min, easy, settis, wings
    - Torsten&Irina
  • 35 min - really nice layout - solveable without any hints needed
    - Susi
  • Decision on 7/8 in column 2 (H/J) leads to contradiction for 1234 in columns 1/2. The rest is careful elimination and settis.
    - Benny_42
  • Nice - a Triple and Korbinians hint solves directly.
    - Jens
  • 58 min took me a while to see
    - Boerny
  • 26:04 Logic and settis. After CE: D1+E1=6 may speed up things.
    - Korbinian Bär
  • 1h 41' no guessing, settis and CE
    - Manfred