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Daily Sudoku Answer 



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Jul 25 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C7 can only be <9>

R3C1 is the only square in row 3 that can be <1>

R3C2 is the only square in row 3 that can be <4>

R5C5 is the only square in row 5 that can be <1>

R6C4 is the only square in row 6 that can be <5>

R7C8 is the only square in row 7 that can be <5>

R7C9 is the only square in row 7 that can be <4>

R6C8 is the only square in row 6 that can be <4>

R5C7 can only be <3>

R9C7 can only be <6>

R8C7 can only be <1>

R2C7 can only be <4>

R2C9 is the only square in row 2 that can be <1>

R5C6 is the only square in row 5 that can be <4>

R9C1 is the only square in row 9 that can be <4>

R9C4 is the only square in column 4 that can be <8>

R9C2 is the only square in row 9 that can be <2>

R1C6 is the only square in column 6 that can be <5>

Squares R5C9 and R6C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C9 - removing <2> from <278> leaving <78>

R8C9 - removing <9> from <3789> leaving <378>

R9C9 - removing <9> from <379> leaving <37>

R1C8 is the only square in row 1 that can be <2>

R9C8 is the only square in row 9 that can be <9>

Squares R3C4 and R3C6 in block 2 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.

R2C4 - removing <79> from <2379> leaving <23>

R2C5 - removing <79> from <2379> leaving <23>

Squares R2C4 and R2C5 in row 2 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.

R2C2 - removing <3> from <379> leaving <79>

R2C3 - removing <3> from <35789> leaving <5789>

Squares R2C2 and R4C2 in column 2 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 column.

R1C2 - removing <7> from <367> leaving <36>

R8C2 - removing <7> from <367> leaving <36>

Squares R7C4 and R7C6 in block 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <37>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R8C5 - removing <37> from <2379> leaving <29>

R8C6 - removing <37> from <2379> leaving <29>

R4C5 is the only square in column 5 that can be <7>

R4C1 can only be <2>

R4C2 can only be <9>

R4C6 can only be <3>

R2C2 can only be <7>

R7C6 can only be <7>

R7C4 can only be <3>

R3C6 can only be <9>

R2C8 can only be <8>

R2C1 can only be <5>

R8C8 can only be <7>

R1C9 can only be <7>

R3C4 can only be <7>

R8C6 can only be <2>

R2C4 can only be <2>

R8C5 can only be <9>

R9C9 can only be <3>

R9C3 can only be <7>

R8C9 can only be <8>

R2C3 can only be <9>

R8C1 can only be <6>

R2C5 can only be <3>

R5C4 can only be <9>

R5C9 can only be <2>

R6C5 can only be <2>

R6C9 can only be <9>

R8C2 can only be <3>

R1C1 can only be <8>

R8C3 can only be <5>

R1C2 can only be <6>

R5C3 can only be <8>

R1C3 can only be <3>

R5C1 can only be <7>



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