Oct 18 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C6 can only be <2>
R6C3 can only be <6>
R2C8 is the only square in row 2 that can be <4>
R3C2 is the only square in row 3 that can be <8>
R4C8 is the only square in row 4 that can be <6>
R6C2 is the only square in row 6 that can be <4>
R8C1 is the only square in row 8 that can be <6>
Squares R5C4 and R9C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R8C4 - removing <9> from <1389> leaving <138>
Squares R3C8 and R6C8 in column 8 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.
R5C8 - removing <29> from <2789> leaving <78>
R7C8 - removing <29> from <23789> leaving <378>
R8C8 - removing <9> from <3789> leaving <378>
Squares R6C7 and R6C8 in block 6 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 block.
R4C7 - removing <9> from <579> leaving <57>
R5C7 - removing <29> from <12579> leaving <157>
R5C9 - removing <29> from <125789> leaving <1578>
R4C2 is the only square in row 4 that can be <9>
Squares R7C2 and R7C3 in row 7 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.
R7C1 - removing <7> from <479> leaving <49>
R7C5 - removing <1> from <134> leaving <34>
R7C7 - removing <7> from <279> leaving <29>
R7C8 - removing <7> from <378> leaving <38>
R7C9 - removing <7> from <2789> leaving <289>
Squares R6C7 and R7C7 in column 7 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.
R3C7 - removing <29> from <129> leaving <1>
R1C9 can only be <7>
R1C1 can only be <3>
R1C4 can only be <1>
R3C3 can only be <5>
R2C4 can only be <8>
R2C6 can only be <6>
R8C4 can only be <3>
R2C5 can only be <5>
R2C9 can only be <2>
R5C6 can only be <9>
R3C8 can only be <9>
R3C1 can only be <2>
R3C5 can only be <3>
R4C3 can only be <7>
R2C1 can only be <7>
R7C5 can only be <4>
R8C5 can only be <1>
R3C9 can only be <6>
R6C8 can only be <2>
R4C7 can only be <5>
R5C3 can only be <3>
R7C3 can only be <1>
R5C7 can only be <7>
R5C4 can only be <4>
R9C6 can only be <7>
R5C8 can only be <8>
R5C9 can only be <1>
R7C8 can only be <3>
R6C7 can only be <9>
R7C2 can only be <7>
R7C1 can only be <9>
R5C5 can only be <6>
R9C4 can only be <9>
R8C8 can only be <7>
R8C2 can only be <5>
R8C6 can only be <8>
R9C9 can only be <5>
R9C1 can only be <4>
R2C2 can only be <1>
R5C1 can only be <5>
R5C2 can only be <2>
R7C7 can only be <2>
R7C9 can only be <8>
R8C9 can only be <9>
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