Solving a picross

Step 1: This grid is 10 by 10. To start, we look for a number close to 10 (here 9) to blacken the overlapping boxes (these boxes are displayed in green in the animation above)

Step 2: Same with the 8

Step 3: Same with the 7

Step 4: These columns end with a square. We can therefore completely blacken the corresponding portions, and delimit them with a cross.

Step 5: Since there cannot be a square to the left of the square already present, this square therefore corresponds to the first information (the 1). And we can therefore frame it with 2 crosses.

Step 6: The square already present is necessarily part of the first portion which measures 3. By imagining the different positions of this portion, we see that one of the boxes overlaps (displayed in green in the animation). We can therefore blacken it.

Step 7: We can cross out the boxes that are too far from the squares already present.

Step 8: Same on the row just below.

Step 9: On this row there are only numbers 1. So we can delimit the squares already present with crosses.

Step 10: On this row, there is only one possibility left. So we can complete the whole row.

Step 11: The first two portions of this row are already displayed, so we can delimit them with crosses.

Step 12: Same, the first portion of this row is already displayed.