Feb 23 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R7C1 is the only square in row 7 that can be <1>
R9C6 is the only square in row 9 that can be <9>
R6C1 is the only square in column 1 that can be <8>
R8C5 is the only square in column 5 that can be <2>
R2C5 is the only square in column 5 that can be <8>
R3C5 is the only square in column 5 that can be <9>
R3C9 can only be <4>
R3C1 can only be <5>
Squares R6C5 and R6C8 in row 6 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.
R6C9 - removing <35> from <1359> leaving <19>
Intersection of column 1 with block 1. The value <9> only appears in one or more of squares R1C1, R2C1 and R3C1 of column 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
R1C2 - removing <9> from <12469> leaving <1246>
R2C2 - removing <9> from <12469> leaving <1246>
Intersection of column 5 with block 5. The values <45> only appears in one or more of squares R4C5, R5C5 and R6C5 of column 5. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.
R5C4 - removing <5> from <156> leaving <16>
R5C6 - removing <45> from <145> leaving <1>
R5C4 can only be <6>
R1C3 is the only square in column 3 that can be <1>
R2C4 is the only square in row 2 that can be <1>
R7C5 is the only square in column 5 that can be <6>
R7C9 can only be <3>
R9C7 can only be <8>
R5C7 can only be <9>
R1C7 can only be <3>
R6C9 can only be <1>
R6C2 can only be <9>
R4C9 can only be <2>
R1C4 can only be <5>
R4C8 can only be <3>
R1C6 can only be <4>
R9C4 can only be <3>
R2C6 can only be <3>
R8C6 can only be <5>
R4C5 can only be <4>
R6C8 can only be <5>
R6C5 can only be <3>
R5C8 can only be <8>
R8C9 can only be <6>
R2C9 can only be <9>
R9C9 can only be <5>
R8C4 can only be <8>
R1C9 can only be <8>
R4C1 can only be <7>
R5C5 can only be <5>
R4C2 can only be <1>
R8C1 can only be <4>
R8C8 can only be <7>
R9C3 can only be <2>
R8C2 can only be <3>
R9C8 can only be <4>
R9C1 can only be <6>
R5C3 can only be <4>
R5C2 can only be <2>
R9C2 can only be <7>
R2C1 can only be <2>
R2C8 can only be <6>
R1C1 can only be <9>
R1C2 can only be <6>
R2C2 can only be <4>
R1C8 can only be <2>
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