Nearly locked sets can be used to create links.
In the Sudoku below, there is an ALS marked in the blue rectangle. Another one is in cell B1. If the number “2” is chosen as a solution in cell B1, the pair (3,9) will be formed in cells B7/B8, and the number 9 can be eliminated in cell C7. If the number “5” is chosen as a solution in cell B1, the number “9” can also be eliminated in C7.
