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Daily Sudoku Answer 



The full reasoning can be found below the Sudoku.

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Mar 17 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C3 is the only square in row 1 that can be <9>

R1C7 is the only square in row 1 that can be <6>

R2C6 is the only square in row 2 that can be <9>

R3C1 is the only square in row 3 that can be <6>

R6C8 is the only square in row 6 that can be <6>

R4C3 is the only square in row 4 that can be <6>

R8C6 is the only square in row 8 that can be <5>

R8C4 is the only square in row 8 that can be <6>

R8C2 is the only square in column 2 that can be <3>

R7C8 is the only square in block 9 that can be <7>

Intersection of row 5 with block 4. The value <8> only appears in one or more of squares R5C1, R5C2 and R5C3 of row 5. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R6C1 - removing <8> from <124578> leaving <12457>

R6C2 - removing <8> from <1248> leaving <124>

R1C2 is the only square in column 2 that can be <8>

R2C9 is the only square in row 2 that can be <8>

R2C8 is the only square in row 2 that can be <5>

Squares R4C6 and R4C8 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C1 - removing <2> from <12457> leaving <1457>

R4C2 - removing <2> from <124> leaving <14>

R4C4 - removing <23> from <2347> leaving <47>

R4C5 - removing <3> from <349> leaving <49>

R4C9 - removing <23> from <12359> leaving <159>

R4C6 is the only square in block 5 that can be <3>

R4C8 can only be <2>

R9C8 can only be <3>

R5C9 can only be <3>

R5C7 can only be <7>

R6C7 can only be <1>

R8C3 is the only square in column 3 that can be <7>

Squares R3C2 and R3C6 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C7 - removing <2> from <234> leaving <34>

Squares R5C1 and R5C3 in block 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R6C1 - removing <2> from <2457> leaving <457>

R6C2 - removing <2> from <24> leaving <4>

R4C2 can only be <1>

R3C2 can only be <2>

R3C6 can only be <1>

R2C1 can only be <1>

R9C6 can only be <8>

R6C6 can only be <2>

R7C5 can only be <3>

R8C1 can only be <4>

R6C4 can only be <7>

R7C4 can only be <1>

R3C5 can only be <4>

R8C9 can only be <1>

R9C1 can only be <2>

R7C9 can only be <2>

R9C3 can only be <1>

R9C7 can only be <4>

R5C1 can only be <8>

R7C3 can only be <8>

R3C7 can only be <3>

R4C5 can only be <9>

R1C4 can only be <2>

R2C7 can only be <2>

R4C9 can only be <5>

R6C5 can only be <8>

R4C1 can only be <7>

R6C9 can only be <9>

R5C3 can only be <2>

R6C1 can only be <5>

R4C4 can only be <4>

R1C9 can only be <4>

R2C4 can only be <3>



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