Oct 22 - Hard
Puzzle Copyright © Kevin Stone
Share link – www.brainbashers.com
Reasoning
R3C2 can only be <7>
R5C5 can only be <7>
R8C7 can only be <9>
R1C2 can only be <1>
R2C1 can only be <5>
R2C3 can only be <8>
R5C2 is the only square in row 5 that can be <2>
R4C7 is the only square in row 4 that can be <2>
Squares R5C4 and R5C6 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R5C8 - removing <58> from <14589> leaving <149>
R5C9 - removing <8> from <189> leaving <19>
Squares R4C5 and R6C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R2C5 - removing <36> from <1346> leaving <14>
R8C5 - removing <6> from <1246> leaving <124>
R9C5 - removing <36> from <1369> leaving <19>
Intersection of row 3 with block 2. The value <3> only appears in one or more of squares R3C4, R3C5 and R3C6 of row 3. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.
R2C4 - removing <3> from <3467> leaving <467>
R2C6 - removing <3> from <1367> leaving <167>
Intersection of column 9 with block 6. The value <9> only appears in one or more of squares R4C9, R5C9 and R6C9 of column 9. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.
R4C8 - removing <9> from <5789> leaving <578>
R5C8 - removing <9> from <149> leaving <14>
Intersection of block 7 with row 8. The value <1> only appears in one or more of squares R8C1, R8C2 and R8C3 of block 7. These squares are the ones that intersect with row 8. Thus, the other (non-intersecting) squares of row 8 cannot contain this value.
R8C5 - removing <1> from <124> leaving <24>
R8C6 - removing <1> from <1678> leaving <678>
R8C9 - removing <1> from <18> leaving <8>
Squares R7C8 and R9C8 in column 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R5C8 - removing <1> from <14> leaving <4>
R6C8 - removing <1> from <14578> leaving <4578>
R3C8 can only be <9>
R6C7 can only be <3>
R6C5 can only be <6>
R2C7 can only be <4>
R2C5 can only be <1>
R3C6 can only be <3>
R1C8 can only be <7>
R4C5 can only be <3>
R2C9 can only be <3>
R9C5 can only be <9>
R3C4 can only be <4>
R1C5 can only be <2>
R1C4 can only be <5>
R8C5 can only be <4>
R8C1 can only be <1>
R1C6 can only be <9>
R5C4 can only be <8>
R5C6 can only be <5>
R8C3 can only be <6>
R5C1 can only be <9>
R8C6 can only be <7>
R4C3 can only be <5>
R9C2 can only be <3>
R8C4 can only be <2>
R2C6 can only be <6>
R9C4 can only be <6>
R7C2 can only be <4>
R9C8 can only be <1>
R2C4 can only be <7>
R7C4 can only be <3>
R7C6 can only be <1>
R9C6 can only be <8>
R7C8 can only be <6>
R4C8 can only be <8>
R6C3 can only be <1>
R4C2 can only be <6>
R6C8 can only be <5>
R5C9 can only be <1>
R4C1 can only be <7>
R6C9 can only be <7>
R6C1 can only be <4>
R4C9 can only be <9>
R6C2 can only be <8>
Today's Sudoku Puzzles
All daily items change at midnight GMT – set your local time zone.
Note: BrainBashers has a Dark Mode setting.