MXQ

Introduction Initial Values Start Grid Sub RC Elimination 2-Cell Chains Strange 2C Chains Swordfish Patterns Re-Check/Refresh X-Wing Patterns 7C Swordfish 4-Cell Chains (Row) 4-Cell Chains (Col) Solution Change Tracking Re-Eng. Grids

MXQ Adv. Sudoku

Solution

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When all the digits that don't allow the rows, columns & blocks to contain un-duplicated digits 1-9, then the solution has been achieved.

Solution