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Daily Sudoku Answer 



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Feb 10 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R9C2 can only be <2>

R6C2 can only be <4>

R1C4 is the only square in row 1 that can be <4>

R2C3 is the only square in row 2 that can be <4>

R5C7 is the only square in row 5 that can be <4>

R8C8 is the only square in row 8 that can be <4>

R9C6 is the only square in row 9 that can be <4>

R9C5 is the only square in row 9 that can be <1>

R2C6 is the only square in row 2 that can be <1>

R6C4 is the only square in row 6 that can be <1>

R5C3 is the only square in row 5 that can be <1>

R5C1 is the only square in row 5 that can be <5>

R9C1 can only be <7>

R8C9 is the only square in row 8 that can be <1>

R3C6 is the only square in column 6 that can be <6>

R6C7 is the only square in column 7 that can be <7>

R6C6 can only be <2>

R6C9 can only be <8>

R5C6 can only be <3>

R5C4 can only be <8>

R5C9 can only be <2>

R7C6 can only be <9>

R1C9 can only be <3>

R4C8 can only be <3>

R4C6 can only be <7>

R4C4 can only be <9>

R2C2 is the only square in column 2 that can be <3>

Squares R3C3 and R3C7 in row 3 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.

R3C4 - removing <2> from <237> leaving <37>

R3C5 - removing <29> from <2379> leaving <37>

Squares R7C3 and R9C3 in column 3 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 column.

R8C3 - removing <8> from <689> leaving <69>

Squares R1C5 and R2C5 in column 5 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 column.

R7C5 - removing <2> from <238> leaving <38>

R8C5 - removing <2> from <278> leaving <78>

Intersection of column 8 with block 3. The value <2> only appears in one or more of squares R1C8, R2C8 and R3C8 of column 8. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C7 - removing <2> from <2569> leaving <569>

R2C7 - removing <2> from <2689> leaving <689>

R3C7 - removing <2> from <29> leaving <9>

R3C3 can only be <2>

R4C3 can only be <6>

R2C1 can only be <6>

R4C1 can only be <2>

R8C3 can only be <9>

R8C2 can only be <6>

R2C7 can only be <8>

R1C2 can only be <9>

R2C8 can only be <2>

R8C7 can only be <2>

R2C5 can only be <9>

R1C8 can only be <5>

R8C4 can only be <7>

R7C7 can only be <5>

R1C5 can only be <2>

R1C7 can only be <6>

R9C8 can only be <8>

R7C3 can only be <8>

R8C5 can only be <8>

R3C4 can only be <3>

R7C5 can only be <3>

R9C3 can only be <5>

R3C5 can only be <7>

R7C4 can only be <2>



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