Star Battle techniques
The four deductions that solve every Pencilmark Star Battle, from simplest to hardest.
Last candidate
Every row, column and region needs a star.
Confined region
If every remaining cell of a region sits in one row or column, that line's star belongs to the region and all other cells of that line are out.
Neighbor squeeze
Pretend a star sits in a cell.
Region group
When two or three rows or columns can only hold stars from the same number of regions, those regions are used up and their other cells can be crossed out.