Omission Walkthrough

Omission (Locked Candidates) occurs when, within a box, a candidate is confined to a single row or column. The digit must fall on that line, so it can be eliminated from the rest of that row or column.

Sudoku board with pencil-mark candidates before applying the Omission technique — Before — candidates pencilled in. Omission can be applied between Row 5 and Block 6.

Omission can be applied between Row 5 and Block 6. Applying the Omission eliminates 4 candidates (struck out in red below; any solved cells shown in green).

The same Sudoku board after the Omission technique eliminates 4 candidates — After applying the Omission.

Learn the Omission technique →Practice it on a real puzzle →