Nov 11 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R4C4 can only be <7>
R6C4 can only be <4>
R1C5 is the only square in row 1 that can be <6>
R1C6 is the only square in row 1 that can be <4>
R2C7 is the only square in row 2 that can be <6>
R3C3 is the only square in row 3 that can be <4>
R4C3 is the only square in row 4 that can be <6>
R5C7 is the only square in row 5 that can be <4>
R5C5 is the only square in row 5 that can be <5>
R2C3 is the only square in row 2 that can be <5>
R1C4 is the only square in row 1 that can be <5>
R3C7 is the only square in row 3 that can be <5>
R3C8 is the only square in row 3 that can be <9>
R7C6 is the only square in row 7 that can be <5>
R8C5 is the only square in row 8 that can be <4>
R9C1 is the only square in row 9 that can be <5>
R5C2 is the only square in column 2 that can be <2>
R7C8 is the only square in column 8 that can be <2>
R7C7 is the only square in row 7 that can be <8>
R9C5 is the only square in column 5 that can be <2>
Squares R4C6 and R6C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R3C6 - removing <8> from <178> leaving <17>
Intersection of row 8 with block 7. The value <3> only appears in one or more of squares R8C1, R8C2 and R8C3 of row 8. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
R7C2 - removing <3> from <137> leaving <17>
R7C3 - removing <3> from <1379> leaving <179>
Intersection of column 1 with block 4. The values <39> only appears in one or more of squares R4C1, R5C1 and R6C1 of column 1. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain these values.
R5C3 - removing <9> from <179> leaving <17>
R6C3 - removing <3> from <137> leaving <17>
R8C3 is the only square in column 3 that can be <3>
R8C7 is the only square in row 8 that can be <9>
R4C7 can only be <2>
R4C6 can only be <8>
R6C7 can only be <1>
R6C3 can only be <7>
R6C6 can only be <2>
R5C3 can only be <1>
R7C3 can only be <9>
R9C4 is the only square in row 9 that can be <9>
R1C1 is the only square in column 1 that can be <1>
R1C9 can only be <8>
R6C9 can only be <3>
R2C8 can only be <1>
R8C8 can only be <7>
R6C1 can only be <8>
R4C9 can only be <9>
R8C2 can only be <1>
R5C8 can only be <8>
R9C9 can only be <1>
R9C6 can only be <7>
R4C1 can only be <3>
R5C9 can only be <7>
R5C1 can only be <9>
R7C2 can only be <7>
R3C6 can only be <1>
R7C5 can only be <3>
R3C4 can only be <3>
R7C4 can only be <1>
R2C5 can only be <8>
R2C2 can only be <3>
R3C5 can only be <7>
R3C2 can only be <8>
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