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Daily Sudoku Answer 



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Feb 26 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C8 is the only square in row 2 that can be <4>

R3C9 is the only square in row 3 that can be <8>

R5C9 is the only square in column 9 that can be <4>

R6C6 is the only square in block 5 that can be <4>

R8C5 is the only square in row 8 that can be <4>

R6C4 is the only square in block 5 that can be <7>

Squares R2C1 and R2C4 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C5 - removing <9> from <379> leaving <37>

R2C7 - removing <1> from <137> leaving <37>

Intersection of row 3 with block 1. The value <1> only appears in one or more of squares R3C1, R3C2 and R3C3 of row 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R1C1 - removing <1> from <1259> leaving <259>

R1C2 - removing <1> from <1235> leaving <235>

R2C1 - removing <1> from <19> leaving <9>

R2C4 can only be <1>

Intersection of row 3 with block 2. The value <6> only appears in one or more of squares R3C4, R3C5 and R3C6 of row 3. 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 <569> leaving <59>

R1C5 - removing <6> from <3679> leaving <379>

Intersection of row 6 with block 4. The value <6> only appears in one or more of squares R6C1, R6C2 and R6C3 of row 6. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R5C3 - removing <6> from <123569> leaving <12359>

Intersection of row 9 with block 7. The values <14> only appears in one or more of squares R9C1, R9C2 and R9C3 of row 9. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain these values.

R8C3 - removing <1> from <1256> leaving <256>

Intersection of column 3 with block 4. The values <39> only appears in one or more of squares R4C3, R5C3 and R6C3 of column 3. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain these values.

R5C2 - removing <3> from <12358> leaving <1258>

R6C2 - removing <3> from <38> leaving <8>

R6C1 can only be <6>

Squares R4C1 and R4C2 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C3 - removing <5> from <59> leaving <9>

R4C8 - removing <5> from <578> leaving <78>

R6C3 can only be <3>

R6C7 can only be <9>

R5C8 is the only square in column 8 that can be <5>

R5C7 is the only square in row 5 that can be <3>

R2C7 can only be <7>

R2C5 can only be <3>

R4C7 can only be <8>

R4C8 can only be <7>

R3C5 can only be <6>

R3C6 can only be <5>

R3C1 can only be <1>

R1C4 can only be <9>

R1C5 can only be <7>

R9C5 can only be <8>

R3C2 can only be <3>

R5C5 can only be <9>

R5C6 can only be <6>

R5C4 can only be <8>

R8C6 can only be <7>

R8C9 can only be <1>

R9C6 can only be <3>

R8C7 can only be <6>

R1C9 can only be <3>

R7C6 can only be <9>

R1C8 can only be <6>

R7C9 can only be <7>

R1C7 can only be <1>

R9C8 can only be <2>

R9C1 can only be <4>

R9C4 can only be <6>

R8C8 can only be <8>

R7C8 can only be <3>

R4C1 can only be <5>

R9C3 can only be <1>

R4C2 can only be <4>

R1C1 can only be <2>

R9C2 can only be <7>

R5C3 can only be <2>

R1C2 can only be <5>

R7C1 can only be <8>

R7C2 can only be <2>

R5C2 can only be <1>

R8C3 can only be <5>

R7C4 can only be <5>

R7C3 can only be <6>

R8C4 can only be <2>



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