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Daily Sudoku Answer 



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Apr 21 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C7 is the only square in row 2 that can be <5>

R1C2 is the only square in row 1 that can be <5>

R7C2 is the only square in row 7 that can be <7>

R3C7 is the only square in row 3 that can be <7>

R5C7 can only be <4>

R2C1 is the only square in row 2 that can be <7>

R7C8 is the only square in row 7 that can be <8>

R1C9 is the only square in row 1 that can be <8>

R8C4 is the only square in row 8 that can be <5>

R9C9 is the only square in row 9 that can be <9>

R5C3 is the only square in column 3 that can be <8>

R9C8 is the only square in column 8 that can be <2>

R8C9 is the only square in column 9 that can be <4>

R6C9 is the only square in column 9 that can be <7>

R6C1 is the only square in block 4 that can be <2>

Squares R9C1 and R9C2 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C4 - removing <6> from <678> leaving <78>

R9C6 - removing <6> from <678> leaving <78>

Squares R9C1 and R9C2 in block 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R8C1 - removing <6> from <136> leaving <13>

Intersection of row 2 with block 2. The value <6> only appears in one or more of squares R2C4, R2C5 and R2C6 of row 2. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R1C4 - removing <6> from <126> leaving <12>

R1C6 - removing <6> from <1236> leaving <123>

R3C5 - removing <6> from <36> leaving <3>

R5C5 can only be <2>

R5C4 can only be <7>

R7C5 can only be <6>

R7C7 can only be <1>

R8C6 can only be <2>

R7C3 can only be <2>

R8C7 can only be <6>

R1C6 can only be <1>

R1C4 can only be <2>

R5C6 can only be <3>

R9C4 can only be <8>

R6C6 can only be <9>

R6C4 can only be <1>

R2C6 can only be <6>

R9C6 can only be <7>

R2C4 can only be <9>

R4C6 can only be <8>

R4C4 can only be <6>

R4C2 is the only square in row 4 that can be <9>

R3C2 can only be <6>

R3C8 can only be <1>

R9C2 can only be <4>

R1C1 can only be <3>

R3C3 can only be <9>

R2C9 can only be <3>

R9C1 can only be <6>

R6C2 can only be <3>

R1C8 can only be <6>

R4C1 can only be <4>

R8C1 can only be <1>

R2C3 can only be <1>

R8C3 can only be <3>

R4C9 can only be <1>

R4C5 can only be <5>

R4C8 can only be <3>

R6C5 can only be <4>

R6C8 can only be <5>



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