Sudoku Puzzles

Nice photo, Anne! Looks like a wonderful place to see & be.

Nice picture Anne !!!!

It looks like a great place to relax. Thank you, Anne.

Probably a bit cool this time of year, right?

Bravo, Anne! Have a great day/night, everyone!

12:57

Anne, I love photos of rocks.

Good afternoon to all! Another nice photo Anne! I assume the Blacksmith beach is just around the corner?

Another nice picture Anne good comment Greg

My solution for June25 Tough

23 cells given
UP to 25
basic methods give many eliminations but no solutions

6i2==5h2--5h7==4g7--4g6==4i6--4i4==6i4--6i2 forbids 5h1, 4g9

6g9, 6e1, 5i1 UP 28 cells done

1h6==1d6--1d2==1e2--1e5==1c5--2c5==2f5--5f5==5a5--5a7==5h7 More...

1)Start at 23,=>UP=25

2)fc:(1)d7=(1)ghi7-(1=8)g9-(8)g8=(8)de8
==>de8<>1

3)Coloring(1):ghi7=d 7-d5=e6,=>gi6<>1. UP=31

4)fc:(2=6)d1-(6)h1=(6)g2-(6)g4=(6-4)i4=(4-3)d4=(3)d8
==>d8<>2.UP=81

(For step 3 I am not quite sure,I need Steve's opinion,thanks)

I am a bit confused with both proposed solutions above. Justin, I do not quite understand your notation. I think that you are placing the candidate argument last? Does 6i2 mean candidate 2 at cell i6?
Sotir, I do not understand your step 2). The endpoints: (1)d7=(8)de8 is not sufficient More...

Thanks for your lovely comments, everyone.
Yes, Greg, and that's where you get your sand shoes repaired!

Steve,
First off, thanks for all of your posts, I've learned much from them. Now, on to today's puzzle.
I found all of the eliminations of your step 2 except for the elimination of 8 from b12 by using naked pairs, hidden pairs, and locked candidates. After that I spotted the elimination More...

Steve,
I believe that 4a) should read:
4a) (8)d5=(8-5)f5=(5-6)f2=(6)d2 => d2<>8

Steve,
Step 4c also implies g2<>9 due to locked 9's in g46 of box 6.
And I think the swordfish should read:
4d) sf 9 c48, e468, g46 => e4,f6,bdf8<>9

Steve,
Now I've made typos, here's the (I think) correct version:
4d) sf 9 c48, e468, g46 => d4,f6,bdf8<>9

Beautiful Anne, but yes HalT, it would be far too cold at the moment!!

Wonderful, thanks Anne!

Jeff, thanks for catching my typos. I spend some time posting about sudoku at some other forums where they use different grid conventions. I tend to make mistakes in posts due to the lack of my ability to adjust well between the various grid conventions.

The order of steps is fairly More...

11.32 Knew what it was from Anne's wongerful photos on her page.

Sorry I didn't explain my notation. Rows are numbered from bottom to top, columns are lettered from left to right. 5c2 means the cell in row 5, column c has candidate 2.

22

After further review, Steve is correct. My solution is invalid because the very first step, 6i2==5h2, is invalid.
The second chain is valid, but the third (fc2)depends on the first, and so is also invalid.
Is it possible to delete a post and save everyone some time?
Sorry, my bad.