Translate every clue into candidates
A numbered clue tells you how many cells its patch contains. Factor the number to identify possible rectangles: a 6 might be 1×6 or 2×3 when the shape permits. A square clue restricts equal width and height; tall and wide icons constrain orientation. If a clue gives neither size nor shape, use neighbouring clues and remaining space to infer both later rather than inventing an early boundary.
Draw candidate shapes mentally or by tracing lightly from the clue cell. Edges and corners remove many candidates because a shape cannot extend beyond the board. Clues near each other also compete for cells. The goal of the opening scan is not to finish every patch but to find a clue with only one legal footprint or a cell that can belong to only one clue.





