Sep 23 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R1C1 is the only square in row 1 that can be <4>
R5C5 is the only square in row 5 that can be <4>
R5C6 is the only square in row 5 that can be <3>
R1C9 is the only square in row 1 that can be <3>
R2C5 is the only square in row 2 that can be <3>
R9C1 is the only square in row 9 that can be <3>
R9C9 is the only square in row 9 that can be <4>
R6C5 is the only square in column 5 that can be <2>
R5C7 is the only square in row 5 that can be <2>
R5C8 is the only square in row 5 that can be <1>
R5C4 is the only square in row 5 that can be <8>
R6C6 is the only square in row 6 that can be <1>
R9C2 is the only square in row 9 that can be <2>
R1C4 is the only square in row 1 that can be <2>
R2C1 is the only square in row 2 that can be <2>
R2C9 is the only square in row 2 that can be <1>
R1C3 is the only square in row 1 that can be <1>
R8C9 is the only square in row 8 that can be <2>
R9C7 is the only square in row 9 that can be <1>
R9C8 is the only square in row 9 that can be <8>
R4C4 is the only square in column 4 that can be <6>
R3C7 is the only square in column 7 that can be <8>
Squares R4C9 and R6C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R3C9 - removing <7> from <679> leaving <69>
Squares R5C2 and R5C3 in block 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R4C1 - removing <9> from <589> leaving <58>
Squares R4C1 and R6C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R3C1 - removing <5> from <569> leaving <69>
R7C1 - removing <5> from <1569> leaving <169>
R8C1 - removing <5> from <1569> leaving <169>
Squares R3C1 and R3C9 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R3C3 - removing <69> from <5679> leaving <57>
Squares R2C2 and R3C3 in block 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R1C2 - removing <57> from <5679> leaving <69>
R2C2 is the only square in column 2 that can be <7>
R2C8 can only be <5>
R3C3 can only be <5>
R8C8 can only be <6>
R1C7 can only be <9>
R3C5 can only be <7>
R1C6 can only be <5>
R1C8 can only be <7>
R7C9 can only be <9>
R1C2 can only be <6>
R7C7 can only be <5>
R3C9 can only be <6>
R3C1 can only be <9>
R7C5 can only be <1>
R5C2 can only be <9>
R8C1 can only be <1>
R5C3 can only be <6>
R8C2 can only be <5>
R7C3 can only be <7>
R9C3 can only be <9>
R7C1 can only be <6>
R8C5 can only be <9>
R4C5 can only be <5>
R9C6 can only be <7>
R9C4 can only be <5>
R4C6 can only be <9>
R4C1 can only be <8>
R6C4 can only be <7>
R6C9 can only be <8>
R6C1 can only be <5>
R4C9 can only be <7>
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