Nov 18 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R5C7 can only be <7>
R5C9 can only be <3>
R2C8 is the only square in row 2 that can be <2>
R2C3 is the only square in row 2 that can be <6>
R7C3 can only be <9>
R7C2 can only be <2>
R5C3 can only be <4>
R5C1 can only be <9>
R5C5 can only be <2>
R4C3 is the only square in row 4 that can be <8>
R9C3 can only be <1>
R8C2 can only be <4>
R6C8 is the only square in row 6 that can be <4>
R9C7 is the only square in row 9 that can be <2>
R8C4 is the only square in row 8 that can be <2>
R9C5 is the only square in row 9 that can be <4>
R2C4 is the only square in row 2 that can be <4>
R1C1 is the only square in row 1 that can be <4>
Squares R8C1 and R8C7 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R8C5 - removing <6> from <1367> leaving <137>
R7C5 is the only square in column 5 that can be <6>
Squares R9C6 and R9C8 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R9C9 - removing <5> from <568> leaving <68>
Intersection of row 3 with block 2. The value <3> 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 this value.
R1C4 - removing <3> from <357> leaving <57>
R1C5 - removing <3> from <135789> leaving <15789>
R4C4 is the only square in column 4 that can be <3>
R4C2 can only be <1>
R2C2 can only be <9>
R6C1 can only be <7>
R6C3 can only be <3>
R3C1 can only be <1>
R1C3 can only be <7>
R1C4 can only be <5>
R7C4 can only be <7>
R1C2 can only be <3>
R7C9 can only be <5>
R4C9 can only be <6>
R9C8 can only be <3>
R9C6 can only be <5>
R8C8 can only be <7>
R4C7 can only be <5>
R9C9 can only be <8>
R3C8 can only be <5>
R6C6 can only be <9>
R9C1 can only be <6>
R1C9 can only be <1>
R8C7 can only be <6>
R2C9 can only be <7>
R2C6 can only be <1>
R3C7 can only be <9>
R4C5 can only be <7>
R6C7 can only be <1>
R6C5 can only be <5>
R8C1 can only be <8>
R2C5 can only be <8>
R8C6 can only be <3>
R1C7 can only be <8>
R3C5 can only be <3>
R8C5 can only be <1>
R3C6 can only be <7>
R1C5 can only be <9>
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