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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 ...

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 ...

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

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 ...

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 ...

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 ...

immp & Marty, I really appreciate the time you folks spend bringing us slow folks up to speed.

Thank you both.

Mike

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

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 ...

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 ...

Gianni & immp,

Thanks.

Mike

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 ...

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 ...

Folks, I appreciate the help.

Thanks.

Mike

Folks, I am stuck again. Any pattern help appreciated.

Mike

+--------------+-----------------+---------------+
| 56 1 2579 | 457 4567 47 | 24679 8 3 |
| 4 2378 2578 | 9 5678 ...

Keith, thanks.

I will work on the extra credit.

Mike

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 ...

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 ...

Gianni, thank you.

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

Mike

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 ...