Nov 09 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R6C9 is the only square in row 6 that can be <8>
R8C1 is the only square in column 1 that can be <8>
R9C1 is the only square in column 1 that can be <6>
R3C7 is the only square in column 7 that can be <2>
R5C8 is the only square in column 8 that can be <7>
R2C8 is the only square in column 8 that can be <8>
R4C9 is the only square in block 6 that can be <1>
Intersection of row 2 with block 1. The value <5> only appears in one or more of squares R2C1, R2C2 and R2C3 of row 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
R1C1 - removing <5> from <257> leaving <27>
R1C2 - removing <5> from <2357> leaving <237>
Intersection of row 3 with block 2. The values <68> only appears in one or more of squares R3C4, R3C5 and R3C6 of row 3. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain these values.
R1C4 - removing <6> from <3569> leaving <359>
R1C6 - removing <6> from <4569> leaving <459>
Intersection of row 8 with block 9. The value <6> only appears in one or more of squares R8C7, R8C8 and R8C9 of row 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
R7C7 - removing <6> from <56> leaving <5>
R4C1 is the only square in row 4 that can be <5>
R2C1 can only be <1>
R3C3 can only be <3>
R2C2 can only be <5>
R5C9 is the only square in row 5 that can be <5>
R5C7 is the only square in row 5 that can be <6>
R6C3 is the only square in row 6 that can be <1>
R5C2 is the only square in column 2 that can be <3>
R5C3 is the only square in block 4 that can be <9>
R7C3 can only be <7>
R4C3 can only be <2>
R4C6 can only be <4>
R5C1 can only be <4>
R4C7 can only be <3>
R6C6 can only be <9>
R5C5 can only be <2>
R4C4 can only be <7>
R6C7 can only be <4>
R6C1 can only be <7>
R1C1 can only be <2>
R6C4 can only be <3>
R1C6 can only be <5>
R1C2 can only be <7>
R9C6 can only be <2>
R1C4 can only be <9>
R9C2 can only be <9>
R7C4 can only be <6>
R7C6 can only be <8>
R3C4 can only be <1>
R7C5 can only be <9>
R3C6 can only be <6>
R9C9 can only be <3>
R8C2 can only be <2>
R9C8 can only be <1>
R2C9 can only be <4>
R2C5 can only be <3>
R1C9 can only be <6>
R3C5 can only be <8>
R9C4 can only be <5>
R8C5 can only be <1>
R8C8 can only be <6>
R9C5 can only be <7>
R8C9 can only be <9>
R1C8 can only be <3>
R1C5 can only be <4>
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