Sep 16 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C8 is the only square in row 1 that can be <7>
R2C6 is the only square in row 2 that can be <3>
R5C5 is the only square in column 5 that can be <8>
R4C9 is the only square in column 9 that can be <3>
R3C9 is the only square in column 9 that can be <2>
Squares R4C1 and R4C7 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R4C2 - removing <14> from <12458> leaving <258>
R4C8 - removing <14> from <1248> leaving <28>
Squares R5C4 and R5C6 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R5C2 - removing <14> from <124679> leaving <2679>
R5C7 - removing <14> from <1467> leaving <67>
R5C8 - removing <14> from <12469> leaving <269>
Squares R7C1 and R7C9 in row 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R7C2 - removing <69> from <2679> leaving <27>
R7C6 - removing <6> from <156> leaving <15>
R7C8 - removing <69> from <569> leaving <5>
R7C6 can only be <1>
R5C6 can only be <4>
R5C4 can only be <1>
R3C6 can only be <6>
R3C8 can only be <1>
R8C6 can only be <5>
R1C5 can only be <1>
R2C8 can only be <6>
R1C2 can only be <6>
R2C7 can only be <5>
R9C2 can only be <3>
R2C3 can only be <9>
R9C8 can only be <4>
R9C5 can only be <6>
R8C7 can only be <6>
R3C1 can only be <4>
R3C2 can only be <5>
R3C4 can only be <9>
R4C1 can only be <1>
R2C2 can only be <1>
R4C7 can only be <4>
R5C7 can only be <7>
R7C9 can only be <9>
R6C7 can only be <1>
R7C1 can only be <6>
R6C9 can only be <6>
R8C8 can only be <3>
R6C1 can only be <9>
R6C3 can only be <7>
R6C8 can only be <8>
R5C2 can only be <2>
R8C3 can only be <2>
R6C2 can only be <4>
R4C8 can only be <2>
R8C5 can only be <4>
R4C3 can only be <5>
R5C3 can only be <6>
R7C2 can only be <7>
R8C4 can only be <7>
R2C5 can only be <2>
R2C4 can only be <4>
R4C2 can only be <8>
R5C8 can only be <9>
R7C4 can only be <2>
R8C2 can only be <9>
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