Feb 11 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R3C6 is the only square in row 3 that can be <6>
R1C3 is the only square in row 1 that can be <6>
R5C8 is the only square in row 5 that can be <6>
R5C9 is the only square in row 5 that can be <9>
R1C7 is the only square in row 1 that can be <9>
R6C1 is the only square in row 6 that can be <2>
R3C2 is the only square in row 3 that can be <2>
R8C5 is the only square in row 8 that can be <2>
R8C3 is the only square in row 8 that can be <3>
R6C3 can only be <1>
R4C3 can only be <5>
R2C3 can only be <4>
R9C3 can only be <9>
R3C9 is the only square in row 3 that can be <4>
R1C5 is the only square in row 1 that can be <4>
R6C9 is the only square in row 6 that can be <3>
R4C1 is the only square in row 4 that can be <3>
R5C4 is the only square in row 5 that can be <3>
R8C8 is the only square in row 8 that can be <9>
R7C6 is the only square in row 7 that can be <9>
R9C9 is the only square in row 9 that can be <2>
R9C5 is the only square in row 9 that can be <6>
R9C7 is the only square in column 7 that can be <4>
R2C8 is the only square in column 8 that can be <8>
Squares R5C1 and R5C2 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R5C5 - removing <8> from <158> leaving <15>
R5C6 - removing <8> from <158> leaving <15>
Squares R2C2 and R8C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <15>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R7C2 - removing <15> from <1458> leaving <48>
Squares R5C5 and R5C6 in block 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <15>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R4C5 - removing <1> from <178> leaving <78>
Squares R4C5 and R6C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R2C5 - removing <7> from <157> leaving <15>
R2C7 is the only square in row 2 that can be <7>
R6C7 can only be <8>
R3C8 can only be <1>
R7C8 can only be <7>
R1C9 can only be <5>
R6C5 can only be <7>
R4C7 can only be <1>
R7C9 can only be <1>
R4C9 can only be <7>
R8C7 can only be <5>
R4C5 can only be <8>
R8C2 can only be <1>
R2C2 can only be <5>
R2C5 can only be <1>
R3C1 can only be <7>
R5C5 can only be <5>
R1C6 can only be <8>
R3C4 can only be <5>
R1C1 can only be <1>
R7C4 can only be <8>
R5C6 can only be <1>
R7C2 can only be <4>
R1C4 can only be <7>
R9C4 can only be <1>
R9C6 can only be <5>
R9C1 can only be <8>
R7C1 can only be <5>
R5C2 can only be <8>
R5C1 can only be <4>
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