Feb 16 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R4C7 is the only square in row 4 that can be <3>
R5C8 is the only square in row 5 that can be <1>
R5C2 is the only square in row 5 that can be <8>
R8C2 is the only square in row 8 that can be <3>
R2C5 is the only square in row 2 that can be <3>
R3C1 is the only square in row 3 that can be <3>
R7C9 is the only square in row 7 that can be <3>
R9C3 is the only square in row 9 that can be <1>
R8C6 is the only square in row 8 that can be <1>
Intersection of row 5 with block 5. The value <7> only appears in one or more of squares R5C4, R5C5 and R5C6 of row 5. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.
R4C5 - removing <7> from <5679> leaving <569>
R6C5 - removing <7> from <4579> leaving <459>
Intersection of column 1 with block 7. The value <5> only appears in one or more of squares R7C1, R8C1 and R9C1 of column 1. 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 <5> from <569> leaving <69>
Intersection of block 5 with column 5. The value <5> only appears in one or more of squares R4C5, R5C5 and R6C5 of block 5. These squares are the ones that intersect with column 5. Thus, the other (non-intersecting) squares of column 5 cannot contain this value.
R1C5 - removing <5> from <45789> leaving <4789>
R8C5 - removing <5> from <569> leaving <69>
R9C5 - removing <5> from <568> leaving <68>
R1C9 is the only square in row 1 that can be <5>
R9C1 is the only square in row 9 that can be <5>
R7C1 can only be <9>
R7C2 can only be <6>
R1C1 can only be <4>
R8C3 can only be <2>
R5C1 can only be <2>
R3C2 can only be <9>
R3C9 can only be <6>
R2C2 can only be <2>
R4C2 can only be <5>
R1C3 can only be <8>
R9C9 can only be <2>
R5C9 can only be <9>
R6C2 can only be <4>
R5C6 can only be <7>
R6C7 can only be <7>
R6C3 can only be <9>
R6C8 can only be <2>
R4C8 can only be <6>
R1C7 can only be <9>
R2C3 can only be <6>
R1C5 can only be <7>
R4C5 can only be <9>
R3C6 can only be <8>
R6C5 can only be <5>
R4C3 can only be <7>
R3C4 can only be <4>
R5C4 can only be <6>
R3C8 can only be <7>
R7C6 can only be <5>
R8C5 can only be <6>
R5C5 can only be <4>
R7C4 can only be <7>
R7C8 can only be <8>
R2C6 can only be <9>
R8C4 can only be <9>
R2C8 can only be <4>
R9C7 can only be <6>
R2C4 can only be <5>
R8C7 can only be <4>
R9C5 can only be <8>
R8C8 can only be <5>
R2C7 can only be <8>
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