Nov 29 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R2C3 is the only square in row 2 that can be <1>
R6C2 is the only square in row 6 that can be <9>
R6C3 is the only square in row 6 that can be <2>
R1C3 can only be <6>
R8C9 is the only square in row 8 that can be <7>
R8C7 is the only square in row 8 that can be <1>
R9C4 is the only square in row 9 that can be <5>
Squares R4C4, R5C5 and R6C4 in block 5 form a simple naked triplet. These 3 squares all contain the 3 possibilities <378>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R4C6 - removing <38> from <1358> leaving <15>
R6C6 - removing <38> from <1358> leaving <15>
Intersection of row 8 with block 8. The value <6> 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 this value.
R9C5 - removing <6> from <2368> leaving <238>
Intersection of row 9 with block 9. The values <69> only appears in one or more of squares R9C7, R9C8 and R9C9 of row 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain these values.
R7C9 - removing <9> from <49> leaving <4>
R3C9 can only be <6>
R9C9 can only be <9>
R2C9 can only be <5>
R2C7 can only be <2>
R1C7 can only be <4>
R1C8 can only be <9>
R1C1 is the only square in row 1 that can be <5>
R9C3 is the only square in row 9 that can be <4>
R9C5 is the only square in row 9 that can be <8>
R1C6 is the only square in row 1 that can be <8>
R9C2 is the only square in row 9 that can be <2>
R1C2 can only be <7>
R1C5 can only be <2>
R2C1 can only be <3>
R2C6 can only be <9>
R3C1 can only be <2>
R7C1 can only be <9>
R7C4 can only be <3>
R8C1 can only be <8>
R7C6 can only be <2>
R3C4 can only be <4>
R8C5 can only be <6>
R8C6 can only be <4>
R8C3 can only be <3>
R4C3 can only be <8>
R2C5 can only be <7>
R8C4 can only be <9>
R3C6 can only be <3>
R2C4 can only be <6>
R5C5 can only be <3>
R4C4 can only be <7>
R4C1 can only be <4>
R6C4 can only be <8>
R5C2 can only be <1>
R6C9 can only be <1>
R6C6 can only be <5>
R5C9 can only be <8>
R5C1 can only be <7>
R5C8 can only be <4>
R4C2 can only be <3>
R6C7 can only be <3>
R4C6 can only be <1>
R6C8 can only be <7>
R9C7 can only be <6>
R4C8 can only be <6>
R9C8 can only be <3>
R4C7 can only be <5>
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