Aug 13 - Hard
Puzzle Copyright © Kevin Stone
Share link – www.brainbashers.com
Reasoning
R2C2 is the only square in row 2 that can be <9>
R8C2 can only be <8>
R7C2 can only be <1>
R2C6 is the only square in row 2 that can be <6>
R3C7 is the only square in row 3 that can be <1>
R1C6 is the only square in row 1 that can be <1>
R6C1 is the only square in row 6 that can be <1>
R7C5 is the only square in row 7 that can be <4>
R9C9 is the only square in row 9 that can be <1>
R9C3 is the only square in row 9 that can be <6>
R7C3 is the only square in column 3 that can be <3>
R3C4 is the only square in column 4 that can be <4>
R4C4 is the only square in column 4 that can be <3>
R2C8 is the only square in column 8 that can be <4>
R5C9 is the only square in column 9 that can be <3>
Squares R8C1 and R8C3 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R8C4 - removing <9> from <579> leaving <57>
R8C8 - removing <2> from <257> leaving <57>
Squares R1C5 and R3C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <37>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R4C5 - removing <7> from <6789> leaving <689>
R6C5 - removing <7> from <2789> leaving <289>
R9C5 - removing <7> from <789> leaving <89>
Squares R2C7 and R2C9 in block 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R1C7 - removing <7> from <357> leaving <35>
R3C8 - removing <27> from <2357> leaving <35>
Intersection of row 7 with block 9. The values <29> only appears in one or more of squares R7C7, R7C8 and R7C9 of row 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain these values.
R9C7 - removing <9> from <379> leaving <37>
Intersection of column 6 with block 5. The value <7> only appears in one or more of squares R4C6, R5C6 and R6C6 of column 6. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.
R6C4 - removing <7> from <579> leaving <59>
Intersection of column 8 with block 9. The values <78> only appears in one or more of squares R7C8, R8C8 and R9C8 of column 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain these values.
R9C7 - removing <7> from <37> leaving <3>
R1C7 can only be <5>
R1C3 can only be <4>
R3C8 can only be <3>
R3C5 can only be <7>
R1C1 can only be <6>
R3C2 can only be <5>
R1C5 can only be <3>
R1C2 can only be <7>
R5C1 can only be <9>
R5C2 can only be <6>
R8C1 can only be <2>
R5C5 can only be <2>
R5C8 can only be <5>
R8C8 can only be <7>
R8C3 can only be <9>
R3C1 can only be <8>
R8C4 can only be <5>
R9C8 can only be <8>
R9C5 can only be <9>
R7C8 can only be <2>
R3C3 can only be <2>
R4C1 can only be <4>
R7C7 can only be <9>
R6C4 can only be <9>
R7C6 can only be <8>
R9C4 can only be <7>
R6C5 can only be <8>
R6C3 can only be <5>
R4C5 can only be <6>
R7C9 can only be <5>
R4C7 can only be <7>
R4C6 can only be <5>
R4C9 can only be <9>
R2C7 can only be <2>
R6C9 can only be <2>
R6C6 can only be <7>
R4C3 can only be <8>
R6C7 can only be <4>
R2C9 can only be <7>
Today's Sudoku Puzzles
All daily items change at midnight GMT – set your local time zone.
Note: BrainBashers has a Dark Mode setting.