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Daily Sudoku Answer 



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May 25 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R5C5 can only be <8>

R5C7 can only be <4>

R5C3 can only be <2>

R6C6 can only be <2>

R6C9 can only be <7>

R6C5 can only be <5>

R6C7 can only be <1>

R4C7 can only be <9>

R4C8 can only be <2>

R1C8 is the only square in row 1 that can be <7>

R2C2 is the only square in column 2 that can be <9>

R7C3 is the only square in column 3 that can be <7>

R1C6 is the only square in column 6 that can be <8>

R6C2 is the only square in column 2 that can be <8>

R6C3 can only be <3>

R2C9 is the only square in block 3 that can be <5>

Squares R9C6 and R9C9 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 <1367> leaving <137>

R9C7 - removing <6> from <567> leaving <57>

R9C8 - removing <4> from <14> leaving <1>

Intersection of row 1 with block 1. The values <45> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain these values.

R2C1 - removing <4> from <1346> leaving <136>

R2C3 - removing <4> from <148> leaving <18>

R3C1 - removing <4> from <12346> leaving <1236>

R3C3 - removing <4> from <148> leaving <18>

R1C3 is the only square in column 3 that can be <4>

R4C3 is the only square in column 3 that can be <5>

R4C1 can only be <1>

Intersection of column 2 with block 7. The values <13> only appears in one or more of squares R7C2, R8C2 and R9C2 of column 2. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain these values.

R8C1 - removing <3> from <234> leaving <24>

Intersection of column 4 with block 2. The values <12> only appears in one or more of squares R1C4, R2C4 and R3C4 of column 4. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain these values.

R2C5 - removing <1> from <1346> leaving <346>

R3C5 - removing <1> from <1346> leaving <346>

Intersection of column 6 with block 8. The values <469> only appears in one or more of squares R7C6, R8C6 and R9C6 of column 6. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.

R7C5 - removing <46> from <146> leaving <1>

R8C5 - removing <4> from <1347> leaving <137>

R8C2 is the only square in row 8 that can be <1>

R8C5 is the only square in row 8 that can be <3>

R9C4 can only be <7>

R9C7 can only be <5>

R4C4 can only be <6>

R9C2 can only be <3>

R7C7 can only be <6>

R4C5 can only be <7>

R1C4 can only be <2>

R3C7 can only be <8>

R9C9 can only be <4>

R9C6 can only be <6>

R1C2 can only be <5>

R3C3 can only be <1>

R8C7 can only be <7>

R2C8 can only be <4>

R1C1 can only be <6>

R7C2 can only be <2>

R2C5 can only be <6>

R3C8 can only be <9>

R3C4 can only be <3>

R2C3 can only be <8>

R2C4 can only be <1>

R3C9 can only be <6>

R8C8 can only be <8>

R3C1 can only be <2>

R3C5 can only be <4>

R7C9 can only be <9>

R8C1 can only be <4>

R7C6 can only be <4>

R8C9 can only be <2>

R8C6 can only be <9>

R7C1 can only be <5>

R2C1 can only be <3>



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