Nov 10 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R2C9 is the only square in row 2 that can be <1>
R3C9 is the only square in row 3 that can be <9>
R1C2 is the only square in row 1 that can be <9>
R2C4 is the only square in row 2 that can be <9>
R8C7 is the only square in row 8 that can be <9>
R8C1 is the only square in row 8 that can be <7>
R5C3 is the only square in row 5 that can be <7>
R9C5 is the only square in row 9 that can be <6>
R2C6 is the only square in row 2 that can be <6>
R9C7 is the only square in row 9 that can be <7>
R5C1 is the only square in column 1 that can be <6>
R6C8 is the only square in column 8 that can be <5>
R6C9 is the only square in row 6 that can be <6>
R1C8 is the only square in row 1 that can be <6>
R6C4 is the only square in row 6 that can be <8>
R5C9 is the only square in column 9 that can be <4>
R5C7 is the only square in row 5 that can be <3>
R1C7 can only be <8>
R4C7 can only be <1>
R4C8 can only be <8>
R2C3 is the only square in column 3 that can be <8>
R7C1 is the only square in column 1 that can be <8>
R4C6 is the only square in block 5 that can be <4>
Squares R2C2 and R4C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R7C2 - removing <3> from <135> leaving <15>
R9C2 - removing <3> from <1345> leaving <145>
Intersection of row 8 with block 8. The values <48> only appears in one or more of squares R8C4, R8C5 and R8C6 of row 8. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.
R9C4 - removing <4> from <2345> leaving <235>
R8C4 is the only square in column 4 that can be <4>
Intersection of column 4 with block 8. The value <3> only appears in one or more of squares R7C4, R8C4 and R9C4 of column 4. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.
R7C5 - removing <3> from <1235> leaving <125>
R8C5 - removing <3> from <138> leaving <18>
R8C8 is the only square in row 8 that can be <3>
R3C8 can only be <2>
R7C9 can only be <2>
R3C6 can only be <8>
R9C8 can only be <1>
R1C9 can only be <3>
R1C3 can only be <4>
R8C6 can only be <1>
R8C5 can only be <8>
R7C5 can only be <5>
R6C3 can only be <1>
R9C3 can only be <3>
R3C1 can only be <3>
R3C5 can only be <4>
R4C1 can only be <2>
R9C1 can only be <4>
R2C2 can only be <2>
R4C2 can only be <3>
R6C2 can only be <4>
R7C2 can only be <1>
R7C4 can only be <3>
R1C5 can only be <2>
R9C2 can only be <5>
R9C4 can only be <2>
R5C4 can only be <5>
R1C6 can only be <5>
R2C5 can only be <3>
R5C5 can only be <1>
R5C6 can only be <2>
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