Jun 20 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R2C4 is the only square in row 2 that can be <6>
R4C4 can only be <7>
R2C2 is the only square in row 2 that can be <8>
R3C2 is the only square in row 3 that can be <3>
R4C5 is the only square in row 4 that can be <6>
R4C9 is the only square in row 4 that can be <3>
R7C7 is the only square in row 7 that can be <3>
R7C5 is the only square in row 7 that can be <8>
R9C3 is the only square in column 3 that can be <6>
R2C6 is the only square in column 6 that can be <7>
Squares R1C5 and R3C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R5C5 - removing <14> from <12349> leaving <239>
R6C5 - removing <14> from <1349> leaving <39>
R9C5 - removing <4> from <24> leaving <2>
R5C4 is the only square in row 5 that can be <2>
Squares R8C4 and R8C6 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R8C7 - removing <4> from <246> leaving <26>
R8C8 - removing <45> from <2459> leaving <29>
R8C9 - removing <5> from <569> leaving <69>
Squares R6C7 and R9C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R1C7 - removing <1> from <1278> leaving <278>
R3C7 - removing <1> from <167> leaving <67>
R5C7 - removing <14> from <148> leaving <8>
R1C8 is the only square in row 1 that can be <8>
R4C6 is the only square in row 4 that can be <8>
R5C6 is the only square in row 5 that can be <4>
R8C6 can only be <5>
R6C4 can only be <5>
R6C6 can only be <1>
R8C4 can only be <4>
R6C7 can only be <4>
R9C7 can only be <1>
R1C7 is the only square in block 3 that can be <2>
R8C7 can only be <6>
R8C9 can only be <9>
R3C7 can only be <7>
R8C8 can only be <2>
R5C9 can only be <1>
R1C9 can only be <5>
R4C8 can only be <9>
R3C9 can only be <6>
R3C8 can only be <1>
R3C5 can only be <4>
R4C3 can only be <1>
R3C3 can only be <5>
R1C5 can only be <1>
R2C3 can only be <2>
R2C1 can only be <1>
R5C3 can only be <9>
R5C5 can only be <3>
R7C3 can only be <4>
R6C2 can only be <7>
R5C1 can only be <5>
R6C5 can only be <9>
R6C1 can only be <3>
R1C2 can only be <4>
R7C8 can only be <5>
R1C3 can only be <7>
R9C2 can only be <5>
R7C1 can only be <2>
R7C2 can only be <9>
R9C8 can only be <4>
R9C1 can only be <7>
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