Feb 28 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R5C1 can only be <3>
R5C9 can only be <6>
R7C1 can only be <9>
R4C2 can only be <4>
R3C9 can only be <8>
R7C7 can only be <3>
R3C1 can only be <6>
R7C9 can only be <1>
R4C8 can only be <2>
R6C2 can only be <7>
R4C5 can only be <3>
R7C8 can only be <8>
R7C2 can only be <2>
R7C3 can only be <4>
R7C5 can only be <5>
R6C5 can only be <4>
R6C8 can only be <5>
R3C2 is the only square in row 3 that can be <5>
R3C5 is the only square in row 3 that can be <9>
R2C2 is the only square in row 2 that can be <9>
R9C5 is the only square in row 9 that can be <1>
Squares R1C4 and R9C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R2C4 - removing <3> from <345> leaving <45>
R8C4 - removing <38> from <2348> leaving <24>
Intersection of row 3 with block 3. The value <4> only appears in one or more of squares R3C7, R3C8 and R3C9 of row 3. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
R2C7 - removing <4> from <467> leaving <67>
R2C8 - removing <4> from <13467> leaving <1367>
Squares R2C5 and R2C7 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R2C3 - removing <7> from <137> leaving <13>
R2C6 - removing <7> from <3457> leaving <345>
R2C8 - removing <67> from <1367> leaving <13>
R3C3 is the only square in column 3 that can be <7>
R3C7 can only be <4>
R3C8 can only be <3>
R5C7 can only be <9>
R2C8 can only be <1>
R5C8 can only be <4>
R2C3 can only be <3>
R8C3 can only be <8>
R1C2 can only be <1>
R8C5 can only be <2>
R5C3 can only be <1>
R8C4 can only be <4>
R5C5 can only be <7>
R5C2 can only be <8>
R5C6 can only be <5>
R2C5 can only be <6>
R5C4 can only be <2>
R2C6 can only be <4>
R2C4 can only be <5>
R2C7 can only be <7>
R1C5 can only be <8>
R8C7 can only be <6>
R1C8 can only be <6>
R8C2 can only be <3>
R9C8 can only be <9>
R9C6 can only be <3>
R8C8 can only be <7>
R1C4 can only be <3>
R8C6 can only be <9>
R9C2 can only be <6>
R9C4 can only be <8>
R1C6 can only be <7>
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