Aug 11 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R2C7 is the only square in row 2 that can be <6>
R7C5 is the only square in row 7 that can be <4>
R7C7 is the only square in row 7 that can be <8>
R8C3 is the only square in row 8 that can be <2>
R3C7 is the only square in block 3 that can be <3>
R1C7 is the only square in column 7 that can be <4>
Squares R1C8 and R1C9 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R1C2 - removing <17> from <1278> leaving <28>
R1C4 - removing <1> from <1258> leaving <258>
R1C6 - removing <1> from <158> leaving <58>
Squares R4C1 and R5C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R2C1 - removing <4> from <345> leaving <35>
R3C1 - removing <4> from <48> leaving <8>
R3C5 can only be <2>
R1C2 can only be <2>
R3C2 can only be <1>
R3C3 can only be <4>
R2C2 can only be <7>
R6C2 can only be <9>
R9C2 can only be <8>
R5C4 is the only square in row 5 that can be <2>
Squares R2C1 and R2C3 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R2C4 - removing <5> from <1459> leaving <149>
R2C5 - removing <5> from <59> leaving <9>
R2C6 - removing <5> from <1459> leaving <149>
R5C6 is the only square in row 5 that can be <9>
R5C9 is the only square in row 5 that can be <3>
R5C1 is the only square in row 5 that can be <4>
R4C1 can only be <6>
R5C5 is the only square in row 5 that can be <6>
R6C6 is the only square in row 6 that can be <3>
R6C9 is the only square in row 6 that can be <6>
R8C8 is the only square in row 8 that can be <3>
R8C6 is the only square in row 8 that can be <6>
R9C6 can only be <5>
R9C1 can only be <3>
R1C6 can only be <8>
R1C4 can only be <5>
R9C3 can only be <9>
R2C1 can only be <5>
R9C4 can only be <7>
R7C3 can only be <5>
R9C8 can only be <6>
R8C5 can only be <8>
R6C4 can only be <1>
R2C3 can only be <3>
R2C4 can only be <4>
R4C6 can only be <4>
R7C8 can only be <1>
R7C9 can only be <9>
R1C8 can only be <7>
R8C9 can only be <7>
R8C4 can only be <9>
R8C7 can only be <5>
R1C9 can only be <1>
R4C8 can only be <5>
R2C6 can only be <1>
R4C4 can only be <8>
R4C5 can only be <7>
R6C7 can only be <7>
R6C5 can only be <5>
R5C7 can only be <1>
R4C3 can only be <1>
R5C3 can only be <7>
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