Aug 10 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R5C5 is the only square in row 5 that can be <2>
R5C6 is the only square in row 5 that can be <8>
R5C4 is the only square in row 5 that can be <3>
R6C5 is the only square in row 6 that can be <4>
R7C3 is the only square in row 7 that can be <2>
R1C3 can only be <8>
R3C7 is the only square in row 3 that can be <8>
R7C9 is the only square in row 7 that can be <4>
R5C7 is the only square in column 7 that can be <7>
R5C3 can only be <6>
R5C1 can only be <5>
R5C9 can only be <1>
Squares R4C2 and R6C2 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.
R2C2 - removing <7> from <127> leaving <12>
R8C2 - removing <79> from <15789> leaving <158>
R9C2 - removing <79> from <15789> leaving <158>
Squares R1C2 and R2C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R8C2 - removing <1> from <158> leaving <58>
R9C2 - removing <1> from <158> leaving <58>
Squares R4C8 and R6C8 in column 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R1C8 - removing <56> from <12456> leaving <124>
R2C8 - removing <6> from <1246> leaving <124>
R8C8 - removing <5> from <158> leaving <18>
R9C8 - removing <56> from <1568> leaving <18>
Squares R8C8 and R9C8 in column 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R1C8 - removing <1> from <124> leaving <24>
R2C8 - removing <1> from <124> leaving <24>
R1C7 is the only square in block 3 that can be <1>
R1C2 can only be <2>
R7C7 can only be <6>
R9C7 can only be <5>
R9C2 can only be <8>
R1C8 can only be <4>
R2C2 can only be <1>
R1C1 can only be <3>
R2C8 can only be <2>
R2C4 can only be <6>
R2C6 can only be <3>
R2C9 can only be <7>
R1C5 can only be <5>
R2C1 can only be <4>
R3C9 can only be <5>
R3C5 can only be <1>
R1C9 can only be <6>
R9C8 can only be <1>
R8C2 can only be <5>
R8C8 can only be <8>
R7C5 can only be <9>
R7C1 can only be <1>
R4C5 can only be <7>
R8C4 can only be <1>
R8C6 can only be <7>
R8C1 can only be <9>
R6C6 can only be <6>
R9C5 can only be <3>
R9C9 can only be <9>
R9C3 can only be <7>
R8C9 can only be <3>
R4C2 can only be <9>
R6C8 can only be <5>
R4C6 can only be <1>
R6C4 can only be <9>
R4C8 can only be <6>
R3C1 can only be <7>
R9C1 can only be <6>
R3C3 can only be <9>
R4C4 can only be <5>
R6C2 can only be <7>
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