Feb 28 - Very Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R4C6 can only be <6>
R6C6 can only be <7>
R5C6 can only be <1>
R2C6 can only be <9>
R8C6 can only be <8>
R2C8 is the only square in row 2 that can be <3>
R4C8 is the only square in row 4 that can be <9>
R5C5 is the only square in row 5 that can be <5>
R6C2 is the only square in row 6 that can be <8>
R9C1 is the only square in column 1 that can be <6>
R9C9 can only be <8>
R1C9 can only be <2>
R5C9 can only be <6>
R1C7 is the only square in row 1 that can be <8>
R1C3 is the only square in row 1 that can be <9>
R2C3 is the only square in row 2 that can be <2>
R3C7 is the only square in row 3 that can be <9>
R7C3 is the only square in row 7 that can be <8>
R8C7 is the only square in row 8 that can be <6>
Squares R2C7 and R9C7 in column 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 column.
R7C7 - removing <7> from <247> leaving <24>
Intersection of column 5 with block 2. The values <46> only appears in one or more of squares R1C5, R2C5 and R3C5 of column 5. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain these values.
R2C4 - removing <4> from <147> leaving <17>
Squares R2C4 and R2C7 in row 2 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.
R2C2 - removing <7> from <467> leaving <46>
R2C5 - removing <17> from <1467> leaving <46>
Intersection of column 5 with block 8. The values <23> only appears in one or more of squares R7C5, R8C5 and R9C5 of column 5. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.
R8C4 - removing <2> from <127> leaving <17>
Squares R3C8 and R8C4 form a remote naked pair. <17> can be removed from any square that is common to their groups.
R8C8 - removing <17> from <1247> leaving <24>
R3C8 is the only square in column 8 that can be <1>
R2C7 can only be <7>
R2C4 can only be <1>
R9C7 can only be <1>
R8C4 can only be <7>
R9C5 can only be <3>
R9C3 can only be <7>
R7C5 can only be <2>
R7C7 can only be <4>
R8C5 can only be <1>
R7C8 can only be <7>
R5C7 can only be <2>
R8C8 can only be <2>
R7C2 can only be <3>
R6C8 can only be <4>
R3C3 can only be <5>
R8C3 can only be <4>
R6C4 can only be <2>
R4C2 can only be <4>
R8C2 can only be <5>
R5C3 can only be <3>
R4C4 can only be <3>
R2C2 can only be <6>
R5C1 can only be <7>
R5C4 can only be <4>
R1C1 can only be <4>
R1C5 can only be <7>
R3C5 can only be <6>
R2C5 can only be <4>
R3C2 can only be <7>
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