Too much guessing. Some hints: in 1st row black are in 6c, 18c,20c, 22c, 24c.In the last row 1 is in c9
r24 c 10
r23 c11 etc.

I liked it, Thank you!

Thank you, Dora, it´s completely logical with your help.

Thank You.

The hints on r1 are not neccessary. This is logical except for the diagonal from r25/c9 - r18/c16. I enjoyed it, thanks!

Thanks - superb. I ignored the hints and it was tough, but fun. I enjoy a hard puzzle!