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Daily Sudoku Answer 



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Oct 15 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R5C3 can only be <8>

R8C4 can only be <1>

R6C6 is the only square in row 6 that can be <8>

R1C6 can only be <9>

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

R4C2 is the only square in column 2 that can be <2>

R7C6 is the only square in column 6 that can be <4>

R8C5 can only be <6>

R9C6 can only be <2>

R2C6 can only be <6>

R2C5 is the only square in column 5 that can be <2>

R1C5 is the only square in column 5 that can be <7>

Squares R9C4 and R9C5 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C1 - removing <9> from <13679> leaving <1367>

R9C8 - removing <5> from <3567> leaving <367>

R9C9 - removing <5> from <13567> leaving <1367>

Squares R1C4 and R3C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C4 - removing <3> from <359> leaving <59>

Squares R5C7 and R7C7 in column 7 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 column.

R3C7 - removing <23> from <2347> leaving <47>

R4C7 - removing <3> from <347> leaving <47>

Squares R8C8 and R8C9 in block 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R9C8 - removing <7> from <367> leaving <36>

R9C9 - removing <7> from <1367> leaving <136>

Intersection of column 2 with block 1. The value <5> only appears in one or more of squares R1C2, R2C2 and R3C2 of column 2. 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 <5> from <1458> leaving <148>

R2C1 - removing <5> from <579> leaving <79>

Squares R2C1 and R3C3 in block 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C2 - removing <7> from <57> leaving <5>

R3C1 - removing <79> from <46789> leaving <468>

R3C2 - removing <7> from <67> leaving <6>

R1C2 can only be <1>

R7C2 can only be <3>

R7C7 can only be <2>

R9C2 can only be <7>

R5C7 can only be <3>

R5C1 can only be <5>

R5C5 can only be <9>

R5C9 can only be <2>

R9C5 can only be <5>

R4C4 can only be <5>

R9C4 can only be <9>

R3C8 is the only square in row 3 that can be <2>

R4C9 is the only square in row 4 that can be <9>

R3C3 is the only square in row 3 that can be <9>

R7C3 can only be <1>

R2C1 can only be <7>

R6C3 can only be <7>

R9C1 can only be <6>

R9C8 can only be <3>

R7C1 can only be <9>

R9C9 can only be <1>

R2C8 can only be <9>

R4C1 can only be <3>

R4C5 can only be <4>

R6C1 can only be <1>

R4C7 can only be <7>

R6C5 can only be <3>

R3C7 can only be <4>

R3C1 can only be <8>

R1C8 can only be <5>

R1C9 can only be <3>

R7C8 can only be <6>

R1C4 can only be <8>

R3C9 can only be <7>

R3C4 can only be <3>

R1C1 can only be <4>

R8C9 can only be <4>

R7C9 can only be <5>

R6C8 can only be <4>

R8C8 can only be <7>

R6C9 can only be <6>



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