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  Topic: 04-12-2017
mtharp

Replies: 10
Views: 10082

PostForum: Daily Sudoku puzzles   Posted: Fri Mar 09, 2018 12:15 am   Subject: 04-12-2017
Keith, thank you. I am still trying to absorb.

Marty, help me understand the strong link on 2 in c4. It looks like to me that there are 3 occurrences of 2 in c4. I thought that a strong link had ...
  Topic: 04-12-2017
mtharp

Replies: 10
Views: 10082

PostForum: Daily Sudoku puzzles   Posted: Thu Mar 08, 2018 12:07 am   Subject: 04-12-2017
Marty, I could not find the W-wing. If you would, please spell it out for me.

I have looked up M-wings and your instruction with respect to this puzzle would be helpful.

Thanks for your time an ...
  Topic: 04-12-2017
mtharp

Replies: 10
Views: 10082

PostForum: Daily Sudoku puzzles   Posted: Wed Mar 07, 2018 3:37 am   Subject: 04-12-2017
I played an X wing on 1 in r67c58, but missed the XY wing. Great elimination.

Looks like I need to look up M-wings also.

Mike
  Topic: chicago tribune 3/2/18 DS too hard - UR help
mtharp

Replies: 12
Views: 10761

PostForum: Other puzzles   Posted: Wed Mar 07, 2018 3:11 am   Subject: chicago tribune 3/2/18 DS too hard - UR help
Marty, as per immp, thanks for the link to Keith's tutorial. Enlightening.

Showing my ignorance, I have to ask, what is DP (unless it refers to the pornographic term).

I am now reading up on W ...
  Topic: chicago tribune 3/2/18 DS too hard - UR help
mtharp

Replies: 12
Views: 10761

PostForum: Other puzzles   Posted: Mon Mar 05, 2018 7:54 pm   Subject: chicago tribune 3/2/18 DS too hard - UR help
Marty, Gianni & immp, I miss wrote the second one. I see one on 6 & 9 in R2,7 C 1,8 not C 1,7.

immp, I work the Chicago Tribune Friday sudoku - they are the one that keep coming up with th ...
  Topic: chicago tribune 3/2/18 DS too hard - UR help
mtharp

Replies: 12
Views: 10761

PostForum: Other puzzles   Posted: Sun Mar 04, 2018 11:32 pm   Subject: chicago tribune 3/2/18 DS too hard - UR help
Folks, immp in particular, I believe the puzzle has two URs on 6 & 9 in R2,5 C1,3 and R2,7 C1,7. I worked on the first one and since there were no other 9s in column 3, I eliminated the 6s but wo ...
  Topic: Dec 19 VH
mtharp

Replies: 16
Views: 15183

PostForum: Daily Sudoku puzzles   Posted: Sun Mar 04, 2018 3:51 am   Subject: Dec 19 VH
immp & Marty, I really appreciate the time you folks spend bringing us slow folks up to speed.

Thank you both.

Mike
  Topic: Dec 19 VH
mtharp

Replies: 16
Views: 15183

PostForum: Daily Sudoku puzzles   Posted: Sat Mar 03, 2018 3:01 pm   Subject: Dec 19 VH
immp, thanks for the type 6 UR lesson. It is starting to make sense. The operative word being "starting".

Is there another way to tackle this UR without using chains?

Mike
  Topic: Dec 19 VH
mtharp

Replies: 16
Views: 15183

PostForum: Daily Sudoku puzzles   Posted: Sat Mar 03, 2018 8:07 am   Subject: Dec 19 VH
Marty, thanks.

You wrote:

Well, the 6 in r5c6 proves a 3 in r6c7=> -3r4c7,r6c1

If you would, please help me understand your logic outside of using a trial and error chain.

Again thanks ...
  Topic: Dec 19 VH
mtharp

Replies: 16
Views: 15183

PostForum: Daily Sudoku puzzles   Posted: Sat Mar 03, 2018 3:23 am   Subject: Dec 19 VH
Folks, I am new to this, but it seems like there is an UR on 45 in r45c16 with diagonal candidates (3,6). I would like to solve this without using chains, which seems to me like trial and error.

I ...
  Topic: Too Hard 022418
mtharp

Replies: 10
Views: 8893

PostForum: Other puzzles   Posted: Tue Feb 27, 2018 10:52 am   Subject: Too Hard 022418
Gianni & immp,

Thanks.

Mike
  Topic: Too Hard 022418
mtharp

Replies: 10
Views: 8893

PostForum: Other puzzles   Posted: Mon Feb 26, 2018 3:42 am   Subject: Too Hard 022418
Gianni, what logic did you use to come to the conclusion that:

r9c4=6 to resolve the UR 6,8 in r56c14

I understand that it does. I do not know that I would have found it. Your method would be ...
  Topic: chicago tribune 2/16/18 DS too hard, BUG+1?
mtharp

Replies: 6
Views: 6619

PostForum: Other puzzles   Posted: Sun Feb 18, 2018 6:03 pm   Subject: chicago tribune 2/16/18 DS too hard, BUG+1?
Folks, I believe this is a BUG+1, with the extra candidate being 9 in column 5 and in box 8. However, there is an extra candidate (7) in row 8. I chose 9 for r8c5 and reached a solution.

Keith, y ...
  Topic: chicago tribune 2/9/18 DS too hard
mtharp

Replies: 7
Views: 7216

PostForum: Other puzzles   Posted: Sun Feb 11, 2018 1:56 pm   Subject: chicago tribune 2/9/18 DS too hard
Folks, I appreciate the help.

Thanks.

Mike
  Topic: chicago tribune 2/9/18 DS too hard
mtharp

Replies: 7
Views: 7216

PostForum: Other puzzles   Posted: Sat Feb 10, 2018 2:49 pm   Subject: chicago tribune 2/9/18 DS too hard
Folks, I am stuck again. Any pattern help appreciated.

Mike


+--------------+-----------------+---------------+
| 56 1 2579 | 457 4567 47 | 24679 8 3 |
| 4 2378 2578 | 9 5678 ...
  Topic: chicago tribune 1/26/18 DS grade too hard
mtharp

Replies: 10
Views: 8683

PostForum: Other puzzles   Posted: Thu Feb 01, 2018 4:42 pm   Subject: chicago tribune 1/26/18 DS grade too hard
Keith, thanks.

I will work on the extra credit.

Mike
  Topic: chicago tribune 1/26/18 DS grade too hard
mtharp

Replies: 10
Views: 8683

PostForum: Other puzzles   Posted: Thu Feb 01, 2018 2:14 am   Subject: chicago tribune 1/26/18 DS grade too hard
Keith, thank you.

To be sure I understand, you posted:

1. This is a BUG+1

A BUG is a pattern that is not unique. It occurs when each cell has two candidates, and each candidate occurs only tw ...
  Topic: chicago tribune 1/26/18 DS grade too hard
mtharp

Replies: 10
Views: 8683

PostForum: Other puzzles   Posted: Wed Jan 31, 2018 3:58 am   Subject: chicago tribune 1/26/18 DS grade too hard
Folks, I am stuck again. Your help appreciated.

Gianni, I always admire your approach.

Keith, your conjugal pair help got me this far:


+---------+---------+-----------+
| 5 7 3 | 1 2 4 ...
  Topic: chicago tribune 1/19/18
mtharp

Replies: 7
Views: 7322

PostForum: Other puzzles   Posted: Sun Jan 21, 2018 12:53 am   Subject: chicago tribune 1/19/18
Gianni, thank you.

I follow the logic but will have to look up why the pattern is called skyscraper.

Mike
  Topic: chicago tribune 1/19/18
mtharp

Replies: 7
Views: 7322

PostForum: Other puzzles   Posted: Sat Jan 20, 2018 2:28 am   Subject: chicago tribune 1/19/18
Again, dailysudoku graded this one as too hard and I got stuck (again):


+--------------+---------------+--------------+
| 1567 9 157 | 4 157 2 | 8 156 3 |
| 8 4 157 | 1367 9 ...
 
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