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So that's it? No one else is going to post a solution for this one? If that's the case, then I guess this really was a VH++! (Ugh!)

Thanks for puzzle immp! That one seemed like a VH+ to me (but your previous one seemed like a VH++! Smile

Here's the grid that I ended up with after basics:

+---------------+-------------+------- ...

I had a tough time with this one immpy!

After basics:
+---------------+---------------+-----------------+
| 236 26 5 | 4 367 2367 | 8 9 1 |
| 7 9 248 | 5 1 28 | 3 ...

I used the 45-8 XY-Wing at r7c68,r9c5 for the 1st step (-8 in r9c89, and -8 in r1c7 due to the 8 LC's in column 9) which opened up the 38-5 XY-Wing at r1c57,r3c4 for the 2nd step (-5 in r1c6,r3c9).

After basics:
+--------------------+----------------+---------------+
| b18 5 c168 | 2 d168 3 | 79 4 79 |
| 2 9 3468 | 47 468 78 | 5 1 36 |
| a1*3 h146 ...

Oh no! Please reconsider immp! I like your VH, VH+, and VH++ ratings!

(Edit:) immp! After giving this just a little more thought I realized that there's really no difference between your curre ...

For anyone that's interested in eleven's 'variable replacement' method, this is how I used it today to solve this puzzle.
This was the grid that I ended up with after basics:

+------------------+- ...

Wow! Eleven's Variable Replacement is ingenious! I did a google search on 'sudoku eleven variable replacement' and read a long detailed explanation of it today! Then I used it to solve this puzzle! ...

Do you mean that it can be solved by humans using the 3 dozen or so techniques that human Sudoku experts use? Or do you mean that it can be solved AT ALL by humans - including trial and error?

Thanks for the puzzle immp! A 'bit' more difficult? Ha!

This was the grid that I ended up with after basics:

+------------------+------------------+---------------+
| 469 69 5 | 3 ...

Thanks for the puzzle, immp!

After basics:
+------------------+-----------------+---------------+
| 1 3456 c56 | 45 28 28 | 7 345 9 |
| 9 245 25 | 7 3 6 | 2 ...

I used a swordfish to remove 5 from r1c4

If anyone out there sees the swordfish on 5's that glesco is referring to, would you point out to me which 3 rows or columns it's in? I looked for a long t ...

Oh! Of course! Regardless of whether 7 is True or False in r4c6, it is False in r5c6! Thanks for the clarification Clement!

(7=1825)r4c6523 - (5)r7c3 = (5-4)r7c6 = (4)r5c6 => - 7r5c6; stte

Hi Clement! Could you explain the logic behind your chain to me? I know that I'm missing something. I can see that if r4c6 i ...

My solution was similar to Tom's:
+--------------+----------------+-------------+
| 2 5 78 | 1 4 6 | 79 3 789 |
| 9 6 1 | 3 7 8 | 4 5 2 |
| 47 48 3 | 5 ...

After basics:
+--------------+---------------+---------------+
| 39 4 12 | 5 19 8 | 6 23 7 |
| 39 5 12 | 6 4 7 | 8 23 19 |
| 78 78 6 | 3 19 2 | 1 ...

Hi Gianni! When you said 'classical steps' I thought that you were referring to just VH moves because many years ago Marty told me that every VH puzzle on this site could be solved by using just the ...

I used the 269 XYZ-Wing r3c56,r7c5 (-6r1c5) which opened up the 69-1 XY-Wing r1c4,r39c6 (-1r1c6, -1r9c4).

For these incorrectly rated puzzles I always try to find the VH move that the computer must have seen without first exhausting all the basics. This one is really interesting! The only thing that I c ...

I need more help with this one. I don't see why you can eliminate the 4 in R3C3.
Tom's solution goes as follows:

If r3c3 is 4 then it's not 8 so r6c3 is 8, so r6c6 is not 8 so it's 9, so r4c4 is ...