Aug 29 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R3C7 is the only square in row 3 that can be <9>
R4C2 is the only square in row 4 that can be <8>
R5C8 is the only square in row 5 that can be <7>
R7C9 is the only square in row 7 that can be <7>
Squares R5C2 and R5C3 in row 5 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 row.
R5C5 - removing <2> from <246> leaving <46>
R5C7 - removing <2> from <246> leaving <46>
Squares R5C2 and R5C3 in block 4 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 block.
R4C1 - removing <2> from <27> leaving <7>
R6C1 - removing <2> from <2357> leaving <357>
R6C2 - removing <2> from <235> leaving <35>
Squares R3C1 and R6C1 in column 1 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 column.
R2C1 - removing <35> from <23456> leaving <246>
R7C1 - removing <3> from <236> leaving <26>
R8C1 - removing <35> from <23456> leaving <246>
Squares R7C1 and R7C7 in row 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <26>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R7C3 - removing <2> from <238> leaving <38>
R7C5 - removing <26> from <2368> leaving <38>
R8C5 is the only square in column 5 that can be <2>
R5C5 is the only square in column 5 that can be <4>
R5C7 can only be <6>
R4C6 can only be <9>
R7C7 can only be <2>
R6C9 can only be <2>
R6C8 can only be <9>
R7C1 can only be <6>
R9C7 can only be <5>
R1C7 can only be <4>
R4C4 can only be <2>
R4C8 can only be <1>
R4C9 can only be <4>
R8C1 can only be <4>
R2C1 can only be <2>
R1C8 is the only square in row 1 that can be <2>
R2C2 is the only square in row 2 that can be <4>
R8C2 is the only square in row 8 that can be <5>
R6C2 can only be <3>
R6C1 can only be <5>
R9C2 can only be <2>
R5C2 can only be <1>
R5C3 can only be <2>
R1C2 can only be <6>
R3C1 can only be <3>
R3C5 can only be <8>
R3C9 can only be <1>
R7C5 can only be <3>
R3C3 can only be <5>
R2C9 can only be <8>
R7C3 can only be <8>
R2C5 can only be <6>
R9C4 can only be <6>
R6C4 can only be <7>
R8C4 can only be <9>
R8C6 can only be <8>
R2C6 can only be <1>
R1C6 can only be <7>
R2C8 can only be <5>
R8C9 can only be <6>
R1C3 can only be <1>
R6C6 can only be <6>
R1C4 can only be <5>
R9C3 can only be <3>
R8C8 can only be <3>
R9C6 can only be <4>
R9C8 can only be <8>
R2C4 can only be <3>
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