The four following hachures (this one included) are my favourite. I think they have a kind of harmony between technique and picture. What do you mean?

Wave-logic 1 helps to place the 5, 6, 8 and 9. It also allows to move 14 and 15 left to C9.
You can easily complete C12-17 without any specific method.

Now, I have to talk you about wave-logic 2.
- Three cells are still to blacken in C6, they can be in R9, R17, R19 or R21. Wherever they are, they spread right to columns C7-8 (as a wave flows on a beach). This induces that three cells are virtually blacken in C8 on those rows. But only three cells are still to blacken in C8. Then, that completes C8 and allows to place crosses in C8 outside these rows, especially in R7C8.
- Two cells are still to blacken in C23, they can be in R9, R19, R21 or R23. Wherever they are, they spread left to column C22. This induces that two cells are virtually blacken in C22 on those rows. Then, that completes C22 and allows to place crosses in C22 outside these rows, especially in R17C22.

Wave-logic 1 helps to finish.

Well, now you know wave-logic 2... and you know where this name come from ;)

Difficulty : *****

Tested, logical.
Wave-logics can be usefull.
Good blackenage.